Navegando por Assunto "Germinação"

Agora exibindo 1 - 20 de 29

Armazenamento de sementes de angico de bezerro (Piptadenia moniliformis Benth.)
(2019) Silva, Elania Freire da; Pinto, Monalisa Alves Diniz da Silva Camargo; http://lattes.cnpq.br/0446410743186066; http://lattes.cnpq.br/6644267105942189
Aspectos fisiológicos de sementes de Piptadenia moniliformis Benth
(2019) Silva, Joyce Naiara da; Silva, Monalisa Alves Diniz da; http://lattes.cnpq.br/0446410743186066; http://lattes.cnpq.br/3432689640499564
With the increasing demand for seeds of high quality native forest species, mainly to support the work of mixed reforestation, it is fundamental that the methods of quality evaluation of the seeds are efficient, so the present work aimed to evaluate aspects pertinent to the physiological quality of seeds of Piptadenia moniliformis Benth. (calico angus). Two experiments were carried out: experiment 1 -Use of seed dormancy overcoming treatments, where they were immersed in concentrated sulfuric acid by (zero -intact seeds, 5, 10, 15, 20 and 25 minutes). The design was a completely randomized design, with six treatments and five replicates of 20 seeds per treatment. Experiment 2 -Evaluation of the methodology of the accelerated aging test, that is, traditional methodology and that employing the use of saturated NaCl solution at 41ºC with periods of zero exposure; 24; 48; 72 and 96 h. Before and after each aging period, regardless of the method, the water content of the seeds was determined. After each treatment the seeds were submitted to electrical conductivity and germination tests. The design was completely randomized, in a 2x5 factorial scheme (methodology x exposure times), with four replicates of 25 seeds per treatment. To overcome seed dormancy there was no statistical difference between the times of 5; 10; 15; 20 and 25 minutes of immersion in sulfuric acid, but the time of 20 minutes provided a larger number of seeds with protrusion of the primary root. The different methods of accelerated aging, conventional and saturated solution, affected the physiological quality of seeds of Piptadenia moniliformis Benth., With the reduction of the germinative potential after 24 hours of exposure. Regarding the methodology employed, the use of the saturated solution generally gave the best results, as the water content of the seeds was lower, thus reducing fungal growth. The results obtained in the biochemical test of electrical conductivity showed that the increase of the aging period, independent of the methodology, caused the increase of the deterioration of the seeds. It is soon concluded that the seeds of P. moniliformis Benth. had their dormancy overcome when immersed in concentrated sulfuric acid for periods of 5; 10; 15; 20 or 25 minutes; and that the different methodologies of accelerated aging, traditional and saturated solution, affected the physiological quality of the seeds.
Avaliação da germinação e crescimento inicial de plântulas de Lactuca sativa L. expostas à polivinilpirrolidona
(2022-05-27) Sales, Érica Danúbia Souza; Nunes, Ramom Rachide; http://lattes.cnpq.br/6182302726895126; http://lattes.cnpq.br/3843458808851603
Seed germination is a crucial moment for plant development and growth, once the species has suffered any kind of injury, excess or scarcity, the consequences can be permanent. Thus, the present work aims to evaluate the germination of Lactuca sativa L. (lettuce) in different concentration of polyvinylpyrrolidone polymer (PVP). Seed sowing (30/plate) was conducted in sterilized Petri dishes containing filter paper. In each plate, 3mL of the aqueous PVP solution was added at concentrations 0.001 mmol/L, 0.01 mmol/L, 0.1 mmol/L, 1 mmol/L and a control group with distilled water. Each treatment had 3 replicates. Seed germination was evaluated daily, at the end of the 7th day, measurements of hypocotyl length, radicle, fresh and dry mass weight, germination percentage tests, vigor index, tolerance, germination speed, water content and photosynthesizing pigments were performed.. The data were expressed in mean ± standard error and submitted to one way ANOVA followed by the Tukey test (the means were considered different when p<0.05). The group treated with 1 mmol/L presented the radicle development affected, while all others did not present major impacts. %G, IVG, IT, hypocotyl and photosynthetic pigments did not present significant results when compared to the control group. Our data indicates a warning sign for the polyvinylpyrrolidone disposal, and highlights the need of further research regarding its toxicity.
Avaliação da germinação e do crescimento inicial de plântulas de Lactuca sativa L. expostas ao cloreto de alumínio em microambiente
(2019) Pádua, Lisandra Celeste da Silva; Saraiva, Rogério de Aquino; http://lattes.cnpq.br/6812072552819682; http://lattes.cnpq.br/1077354209259707
Aluminum when in low soil concentrations can promote growth or even other benefits to plants. However, in acidic soils (pH <5) this metal can cause phytotoxic effects on plants, becoming one of the limiting factors for their growth. The present study aimed to evaluate the phytotoxicity of aluminum chloride (AlCl3) on the germination and initial development of Lactuca sativa L. For this purpose, aqueous solutions of AlCl3 were prepared at concentrations of 0 mg.L-1, 5 mg.L-1,10 mg.L-1, 50 mg.L-1 and 100 mg.L-1. Followed by the application of 3 mL of each solution in Petri dishes containing 25 lettuce seeds each, germinated in a B.O.D (Biochemical Oxigen Demand) chamber lasting seven days. The parameters used to evaluate Al phytotoxicity were: root length, hypocotyl and total, root diameter, NSG / day, IVG, vigor, IT chlorophyll and carotenoid contents and physicochemical parameters. Considering the phytotoxic effects of aluminum demonstrated by the reduction in root size, hypocotyl, total length and increase of root diameter of the seedlings that received the aluminum treatments, the seedlings that received the treatment with the highest concentration showed to be less tolerant to aluminum, however germination, IVG, vigor and chlorophyll and carotenoid contents were not negatively affected by aluminum. Thus it can be concluded that aluminum, despite causing root damage, was not sufficient to inhibit the initial development of lettuce seedlings.
Avaliação do indice de germinação em diferentes genótipos de cana-de-açucar
(2018-08) Flôr, Mateus Ferraz; Silva, Gheysa Coelho; http://lattes.cnpq.br/5485750178709039
The Simplified Selection System (SSS) has the objective of reducing the time for releasing a new variety. However, it presents limitations as to the composition of base populations for selection of families, which must contain the same number of seedlings. The objective of this work was to compare and evaluate the germination index of caryopses obtained by means of different crossing methods and to determine the quantitative of seeds to be used to compose the base population for selection among families by the SSS method. The experiment was conducted under a completely randomized design. Caryopses of 27 crosses between energy cane breeders were evaluated, being eight biparental, ten polycrossing and nine self-fertilization. Sowing of four 0.5 gram samples of caryopses was done by crossing. The number of caryopses germinated five and thirty days after sowing was evaluated. The general averages were grouped by the Scott-Knott method and the comparison between the averages of the different crossing methodologies were performed by the Tukey’s test at 5% of probability. It was verified that the C27 crossing presented the highest germination average of the caryopse in the first evaluation. At the second evaluation, the crosses C8 (76.74%), C27 (61.02%), C3 (53.99%) and C13 (49.65%), although they were statistically different, were shown with high averages. It was observed that, in the first evaluation, the caryopses obtained through self-fertilization presented the highest germination average (12.82%), followed by the polycrosses (10.88%) and the biparental crosses (9.99%), while in the second evaluation, the highest percentage of germination was verified in the biparental crosses (31.10%), followed by the self-fertilization (21.35%) and polycrosses (20.43%). It was verified that the majority of the evaluated crosses presented low germination, being necessary of 2.71 to 800 grams of seeds to homogenize the number of individuals by family. Therefore, it was concluded that only crosses with high germination are recommended to compose the families that will be evaluated through the SSS. Caryopses obtained through self-fertilization germinate rapidly in comparison to the other methods, once that biparental crosses between selected energy cane parents tend to present higher fertility of caryopses. Families C1, C3, C8, C13, C26 and C27 can be used to compose the base populations in the simplified selection system.
Avaliação do potencial alelopático de Chloroleucon foliosum (Benth) G. P. Lewis sobre a germinação e crescimento inicial de alface
(2019) Silva, Sara de Souza; Saraiva, Rogério de Aquino; http://lattes.cnpq.br/6812072552819682; http://lattes.cnpq.br/0125367619888442
Chloroleucon foliolosum(Benth.) G. P. Lewis is a native tree from Caatinga commonly known as "arapiraca" and important to the timber industry and in folk medicine. However, there are few studies aimed at the possible impactscaused by the plant residues when those are released into the environment. Thus, this work aimed to evaluate the allelopathic effect of C. foliolosumleaf and stem ethanolic extracts (EFCF and ECCF, respectively) on germination and initial growthof lettuce (Lactuca sativaL.) seedlings. After collectionof the plant material, the ethanolic extracts were prepared from 50% ethanol. The qualitative phytochemical characterization of EFCF and ECCF was performed according to the methodology of Matos (1997). Thegermination assay was performed in microenvironments consisting of previously sterilized Petri dishes containing filter paper as substrate, containing lettuce seeds. The extracts were tested in concentrations of 1 mg/L, 10 mg/L, 100 mg/L, 1000 mg/L and 10,000 mg/L, as well asthecontrolgroup (distilled water), performed inquadruplicate. After 7 days of germination, was performedthe radicles and aerial parts morphometry, and the calculation of the rate of germination (IVG). The means were submitted to one-way ANOVA followed by the Tukey test and the differences between the treatments were considered significant for the P value <0.05. For both extracts, concentrations equal to or greater than 100 mg/L of EFCF were able to negatively affect lettuce growth,according to the length of radicle and shoot and IVG when compared to control. In phytochemical prospecting, both extracts have alkaloids and tannins; saponins, anthraquinone and catechins in ECCF, and flavonoids and phenolic compounds in EFCF. Therefore,the compounds contained in the extracts can generate different responses, so that the literature indicates that certain alkaloids and some phenolic compounds may be cytotoxic, having their effect enhanced by the presence of saponins and tannins, which mayassociate with the cell wall and facilitate the entryof allelochemicals. Considering the importance of the development of new technologies for the use of Caatinga plants, the study withextracts of C. foliolosumshow high toxicity in the concentrations tested (except 1 mg/L of ECCF), so that the,increase in theconcentrationpotentializedthe effect.
Avaliação do potencial alelopático de extratos obtidos de materiais vegetais utilizados como cobertura morta no controle de espécies de plantas daninhas
(2023) Lustosa, Klenio Raphael Alves; Montarroyos, Angélica Virgínia Valois; http://lattes.cnpq.br/6915874605219533; http://lattes.cnpq.br/1375327527708447
O cloreto de potássio afeta a germinação de sementes e o crescimento inicial de plântulas de Mimosa caesalpiniifolia Benth
(2023-04-20) Lima, Raiane Larissa Silva de; Gallo, Ricardo; http://lattes.cnpq.br/5160912065817980; http://lattes.cnpq.br/7403117695827576
Mimosa caesalpiniifolia Benth., popularly known as sabiá, is a tree species native to the Caatinga and belonging to the Fabaceae family. It has great economic and environmental potential, being used in the production of firewood, charcoal, and forage, as well as being recommended for the recovery of degraded areas. In soils of arid and semi-arid regions, as is the case with the species M. caesalpiniifolia, seed germination can be negatively affected by unsuitable conditions, such as saline soils. Thus, the objective of this study was to evaluate the germination and vigor of Mimosa caesalpiniifolia Benth. seeds subjected to salt stress by potassium chloride (KCl). The experiment was conducted in a completely randomized design with four replications of 32 seeds per treatment. Different osmotic potentials were tested, namely: 0.0 (control); -0.2, -0.4, -0.6, -0.8, -1.0 MPa. The variables evaluated were: germination percentage, germination speed index, shoot and root length, and shoot and root dry weight of seedlings. The species was found to be sensitive to salt stress, reducing germination and vigor significantly with increasing concentrations of KCl.
Comportamento de sementes de Mimosa tenuiflora (Willd.) Poir, submetidas a aplicação do campo magnético e estresse salino
(2023-04-24) Souza, Gleyson Rodrigues de; Silva Junior, Luiz Carlos da; http://lattes.cnpq.br/6998910214479890; http://lattes.cnpq.br/7632781944679348
The influence of the magnetic field on living organisms is a question that intrigues humanity for centuries. The advancement of our knowledge in this area of science makes it possible for us to understand that the action of magnetism causes positive or negative effects in a series of organisms. In recent years, we have been searching for techniques that promote the best development of two plants that have gained proeminence on the entire planet, mainly for the reforestation of native areas. Considering that currently about 20% of the irrigated area suffers from saline stress, the present work sought to analyze the relationship between the intensity of two magnetic fields in comparison to different levels of salinity in the germination of Mimosa tenuiflora (Willd.) Poir. The work was developed in the Laboratory of Energy, Physics and Mathematics of UFRPE-UAST, in two stages. The first from November 20 to 23, 2022 and the second from February 14 to 25, 2023. Foram provided in the first stage four intensity treatments of magnetic field (0 T , 0, 1 T , 0, 14 T and 0, 45 T ) and three levels of salinity (1, 42 dS/m, 4, 01 dS/m and 4, 32 dS/m), for In the second stage, four treatments of magnetic field intensities (0 T , 0, 18 T , 0, 24 T and 0, 45 T ) and three salinity levels (8, 86 dS/m, 13, 78 dS/m and 13, 78 dS/m). In the case of the study on the effects of two different levels of salinity on the germination and development of plants, the choice of delineation in casualized blocks with two repetitions allowed the division of the experimental units in blocks, according to characteristics that could influence our results, such as the intensity of the magnetic field. The germination measurements were carried out daily, after four days of germination the radicle and hypocotyl capsules were measured. Our results show that: 1) In the first stage of the experiment, in the first 48 h, continuous exposure to the magnetic field at an intensity of 0, 1 T was able to attain 90% of germination in comparison with the control that has 80% for salinities of 1, 42 dS/m and 4, 01 dS/m and at a concentration of 4, 32 dS/m the germination rates decreased as the field increased. 2) The compression of the radicle for a salinity of 1, 42 dS/m obtains greater compression as the magnetic field increases. 3) In the second stage of the experiment, in the first 48 h, continuous exposure to the magnetic field at an intensity of 0, 1 T and 0, 45 T will achieve 10% germination reduction compared to the control that has 0% for a salinity of 13, 78 dS/m and at a concentration of 18, 41 dS/m only the seeds exposed to the field of 0, 1 T germinate at a taxa of 2, 5%. 4) In the same band of salinity of 8, 86 dS/m with the increase in field intensity to the radicle and the hypocotyl reaching larger compressions. Demonstrating that viii the application of the magnetic field influences the germination rate and the physiology of seedlings.The influence of the magnetic field on living organisms is a question that intrigues humanity for centuries. The advancement of our knowledge in this area of science makes it possible for us to understand that the action of magnetism causes positive or negative effects in a series of organisms. In recent years, we have been searching for techniques that promote the best development of two plants that have gained proeminence on the entire planet, mainly for the reforestation of native areas. Considering that currently about 20% of the irrigated area suffers from saline stress, the present work sought to analyze the relationship between the intensity of two magnetic fields in comparison to different levels of salinity in the germination of Mimosa tenuiflora (Willd.) Poir. The work was developed in the Laboratory of Energy, Physics and Mathematics of UFRPE-UAST, in two stages. The first from November 20 to 23, 2022 and the second from February 14 to 25, 2023. Foram provided in the first stage four intensity treatments of magnetic field (0 T , 0, 1 T , 0, 14 T and 0, 45 T ) and three levels of salinity (1, 42 dS/m, 4, 01 dS/m and 4, 32 dS/m), for In the second stage, four treatments of magnetic field intensities (0 T , 0, 18 T , 0, 24 T and 0, 45 T ) and three salinity levels (8, 86 dS/m, 13, 78 dS/m and 13, 78 dS/m). In the case of the study on the effects of two different levels of salinity on the germination and development of plants, the choice of delineation in casualized blocks with two repetitions allowed the division of the experimental units in blocks, according to characteristics that could influence our results, such as the intensity of the magnetic field. The germination measurements were carried out daily, after four days of germination the radicle and hypocotyl capsules were measured. Our results show that: 1) In the first stage of the experiment, in the first 48 h, continuous exposure to the magnetic field at an intensity of 0, 1 T was able to attain 90% of germination in comparison with the control that has 80% for salinities of 1, 42 dS/m and 4, 01 dS/m and at a concentration of 4, 32 dS/m the germination rates decreased as the field increased. 2) The compression of the radicle for a salinity of 1, 42 dS/m obtains greater compression as the magnetic field increases. 3) In the second stage of the experiment, in the first 48 h, continuous exposure to the magnetic field at an intensity of 0, 1 T and 0, 45 T will achieve 10% germination reduction compared to the control that has 0% for a salinity of 13, 78 dS/m and at a concentration of 18, 41 dS/m only the seeds exposed to the field of 0, 1 T germinate at a taxa of 2, 5%. 4) In the same band of salinity of 8, 86 dS/m with the increase in field intensity to the radicle and the hypocotyl reaching larger compressions. Demonstrating that the application of the magnetic field influences the germination rate and the physiology of seedlings.
Efeito do estresse salino na germinação de sementes da Moringa oleifera Lam
(2023-05-12) Alves, Beatriz Silva; Lima, Elifábia Neves de; http://lattes.cnpq.br/6117763430610324; http://lattes.cnpq.br/4640617602930699
La Moringa oleifera Lam. es un árbol originario de la India y se cultiva en vários países por su multifuncionalidad. Actualmente, se encuentra ampliamente en el Nordeste brasileño y su crecimiento en esta región está siendo utilizado como purificador de agua en áreas rurales. Dada su gran importancia para los agricultores familiares por sus múltiples aplicaciones de uso, como fuente de alimento, producción de jabón y biodiesel, como sustituto proteico y en su aplicación farmacológica. Este trabajo tuvo como objetivo evaluar el efecto del estrés salino em la germinación de semillas de moringa expuestas a diferentes sales y niveles de salinidad, con el fin de obtener una productividad óptima para los agricultores, ya que la región semiárida se caracteriza por altas concentraciones de sales en el suelo, debido a la escasez de lluvias y la alta tasa de evaporación. El experimento fue realizado en el Laboratorio de Ecología Vegetal de los Ecosistemas del Nordeste (LEVEN) - UFRPE, ubicado en la ciudad de Recife. El diseño experimental fue completamente al azar, con siete tratamientos y cuatro repeticiones, 100 semillas por cada tratamiento. Las sales utilizadas fueron NaCl y KCl con los siguientes niveles: 0,04 M, 0,08 M y 0,12 M. Las variables analizadas fueron el porcentaje de germinación (G%), índice de velocidad de germinación (IVG), longitud del hipocótilo y raíz y la masa seca de las plántulas. Se concluyó que la salinidad no afectó significativamente el porcentaje de germinación de Moringa oleifera Lam. para lãs concentraciones de NaCl y KCl, sin embargo, hubo una reducción en el índice de velocidad de germinación con el aumento de los niveles salinos en las condiciones establecidas en este trabajo. Se observó una reducción en la longitud del hipocótilo y raíz con el aumento de la concentración de sales, siendo la longitud de las plântulas y el número de plántulas normales las más afectadas por el NaCl. La influencia Del KCl aún no ha sido concluyente con este trabajo, siendo necesario seguir trabajando.
Efeitos alelopáticos de Tectona grandis L.F. sobre a germinação e desenvolvimento inicial da alface (Lactuca sativa L. F.)
(2018) Silva, Márcia Cunegundes da; Lima, Tarcísio Viana de; Araujo, Emmanoella Costa Guaraná; http://lattes.cnpq.br/1659011614593700; http://lattes.cnpq.br/0814281560377954
The objective of this work was to evaluate the allelopathic effects of aqueous extracts of Tectona grandis L.F. in various concentrations produced from leaves and flowers. The seeds of Lactuca sativa lettuce were used, with the germitest paper moistened with distilled water and the aqueous extracts in concentrations of 100%, 75%, 50%, 25% and as a control (0% distilled water). The extracts were homogeneously deposited on twentyfive seeds evenly distributed in gerbox boxes. The materials used in the experiment were previously sterilized with 70% alcohol. A completely randomized design with four replicates was used and the experiment was carried out under natural conditions of temperature and humidity, and the tests were carried out in the Laboratory of Forest Seeds (Lasf), the experiment was followed for 10 days at the same time and the variables analyzed were %G, IVG, TM and VM. The data were submitted to Analysis of Variance and compared by Tukey test with probability of 5% error. It was observed that there were no significant differences in leaf extracts and flowers with respect to %G, TM and MV, however, in IVG aqueous leaf extract significantly interfered in the highest concentrations (75% and 100%). It was possible to conclude that the species has an allelopathic potential in the IVG, while the flower extracts show that on VM the concentrations 25% and 100% differed statistically.
Efeitos do tamanho de vagens na germinação e vigor de sementes de pau ferro (Caesalpinia ferrea Mart.)
(2018-02-22) Silva, Júlio César de Almeida; Gonçalves, Edilma Pereira; Ferreira, Débora Teresa da Rocha Gomes; http://lattes.cnpq.br/1123517464184162; http://lattes.cnpq.br/2026865787481365; http://lattes.cnpq.br/5083282435990912
The Caesalpinia ferrea Mart, known as jucá or pau-ferro, is used in folk medicine for its therapeutic properties in the treatment of wounds, bruises, asthma, and chronic cough. In recent years, there has been a great advance in the field of study on seed analysis of native species. However, it is still incipient for several forest species, mainly regarding the basic characteristics of the seeds, the light effect and the depth in the germination process. The experiments were carried out in the Laboratory of Seed Analysis at the Federal Rural University of Pernambuco - Academic Unity of Garanhuns (UFRPE - UAG), in order to verify the influence of the different sizes of fruits on the germination, vigor and sowing depth of Caesalpinia ferrea. The fruits were harvested in the municipality of Paranatama - PE and classified into two lots: batch 1 (Large fruits) and batch 2 (Small fruits). After the harvest, fruit and seed biometry, water content, thousand seed weight, electrical conductivity, ethereal extract, germination and light test, and depth test were performed. For the germination and luminosity test, 200 seeds were used, consisting of four replicates of 50 seeds for each batch in the presence and absence of light, in which were determined the percentage of germination, the length of the shoot and root of seedlings, and the total dry mass of normal seedlings. For the depth test, the experiment was consisted of 4 treatments (0.0, 2.0, 4.0 and 6.0 cm) with 4 replicates of 10 seeds for each batch. The differences verified for the biometry of fruits and seeds have as main cause the genetic variability of the matrices. Seeds behaved as neutral photoblastic for the two lots under study, with interactions between seed size and germination speed index, and root length and total dry mass. The best seeding depth for seeds from large fruits was 3.52 cm, and 3.61 cm for small fruits.
Estágio supervisionado obrigatório na Empresa J&H Sementes: cultura soja (Glycine max)
(2019-12-10) Felix, José Tarciso de Brito; Viana, Jeandson Silva; http://lattes.cnpq.br/2151004858957292; http://lattes.cnpq.br/1408772711656160
This Compulsory Supervised Internship (ESO) report presents the activities that were carried out and tracked at the Jonh & Harold Seeds (J&H seeds) Seed Analysis Laboratory (LAS). J&H is a soybean and cotton seed multiplier company located in the far west region of Bahia, its Seed Processing Unit (UBS) is located on the highway BR 020, Km 21, s / n in Rosario district , Correntina - BA. The company has the best equipment technology for the production of high quality seeds, which are produced on the property, which also has cooperative members. In the seed analysis laboratory, the internal quality control of soybean is determined through paper germination (EP), emergence in the field, vigor testing and evaluation of soybean seed vigor by image analysis with the GroundEye® software. To carry out the tests, samples were collected (Liming), using limers, according to the Seed Analysis Rules (RAS) methodology. The activities performed at the Seed Analysis Laboratory were: Paper Germination Test (EP), Stamina Test and Image Analysis of vigor tests using GroundEye®. In the sheds were carried out the shipment of seed lots and sampling of materials for analysis. In the Industrial Seed Treatment Center, the steps were followed, as well as the preparation of the syrups used in the treatment of soybean and cotton seeds. The experience acquired during the internship period provided a unique opportunity to combine theoretical and practical knowledge, developing skills that are fundamental in a seed multiplier company, contributing in an enriching way to the professional training of an agronomist.
Germinação de sementes de Moringa oleifera Lam. sob diferentes concentrações de cloreto de potássio
(2024-03-08) Souza, Danilo Nunes Lemos Santos de; Lima, Elifábia Neves de; http://lattes.cnpq.br/6117763430610324; http://lattes.cnpq.br/3607823032961358
This study investigates the impact of salt stress on the germination and initial growth of Moringa oleifera LAM., a plant recognized for its nutritional and medicinal properties. The introduction contextualizes the importance of Moringa oleifera and highlights the relevance of studying the effects of saline stress in agricultural environments affected by soil salinization. The experiment evaluated the response of seedlings subjected to saline stress, comparing seeds presoaked in water for 24 hours with those not soaked. Carried out under controlled laboratory conditions, the experiment lasted 15 days, with seeds subjected to different saline solution treatments with Kcl. The concentrations used were Kcl 0.04 M, Kcl 0.08 M and Kcl 0.12 M. The variables analyzed included germination percentage, germination speed index, hypocotyl and main root length. The results indicated that saline stress negatively impacts germination and growth, with a significant reduction in treatments with higher saline concentrations. This study reinforces the importance of understanding the resistance mechanisms of Moringa oleifera to saline stress for the development of sustainable agricultural practices in areas affected by salinity. Contributes to scientific knowledge about plant tolerance to adverse conditions, guiding future research to improve crop resilience in saline environments.
Germinação de sementes sexuadas produzidas por diferentes variedades de cana-de-açúcar utilizadas em cruzamentos
(1992) Barboza, Giovanni Perazzo; Melo, Mario Marreira de; Moura, Mauro Medeiros de
O presente trabalho teve o objetivo de comparar a germinação das sementes sexuadas produzidas, em três anos sucessivos, por oito variedades de cana-de-açúcar utilizadas em cruzamentos. Sob condições naturais, quatro dos progenitores escolhidos são altamente floríferos, enquanto os outros quatro são de difícil florescimento. Suas carlopses, após beneficiamento, foram semeadas para determinação das percentagens de germinação nos três anos em que foi desenvolvido o estudo. Os resultados mostraram diferenças significativas nos índices de germinação das sementes provenientes de diferentes progenitores A percentagem de germinação média das sementes dos quatro progenitores de mais fácil florescimento foi estatisticamente superior à média obtida pelas sementes dos demais progenitores, o que indica a exitância de uma correlação entre a tendência ao florescimento natural dos progenitores e o vigor das sementes por eles produzidas.
Influência do armazenamento no vigor das sementes de alface crespa
(2022) Santos, Mirelly Gonzaga dos; Carvalho, Rejane Rodrigues da Costa e; http://lattes.cnpq.br/3307316028992311; http://lattes.cnpq.br/3394557194566234
Influência do estádio de maturação do fruto na germinação de Malpighia glaba L.
(1994) Nogueira, Rejane Jurema Mansur Custódio; Gusmão, Guilherme de Oliveira
O trabalho foi realizado em casa-de-vegetação com o objetivo de verificar a influencia dos estádios de maturação dos frutos (verdes, de vez, maduros e apodrecidos) na percentagem de germinação. Os frutos foram colhidos pesados e as sementes retiradas manualmente, secas ao ar e plantados em bandejas de isopor, contendo uma mistura de terriço e argila, numa proporção de 2:1, em delineamento inteiramente casualizado. Previamente, em laboratório, sementes de frutos de mesmos estádios de maturação foram colocados em solução de cloreto de tetrazólio para testar-se a viabilidade da germinação. As sementes provenientes de frutos de vez (em processo de maturação) obtiveram o melhor percentual de embriões viáveis, seguidas daquelas de frutos apodrecidos, verdes e maduros. Em casa-de-vegetação, a percentagem de germinação em sementes de frutos apodrecidos foi superior a de frutos de vez, enquanto que não houve diferença entre as sementes de frutos verdes e maduros.
Influência do substrato na germinação de sementes de algaroba
(1997) Passos, Marco Antonio Amaral; Silva, Celiane Pereira da
Este trabalho teve como objetivo verificar qual o melhor substrato para testes de germinação em laboratório com sementes de algaroba.
Influência do tamanho da semente no vigor, em mudas de Guapuruvu (Schizolobium parahyba)
(1978) Lêdo, Álvaro Antônio Magalhães; Silva, José Antônio Aleixo da; Santos, Germi Porto
Este trabalho foi efetuado visando verificar o efeito do tamanho das sementes sobre o vigor e desenvolvimento inicial de mudas de Guapuruvu, pois se sementes de maior tamanho produzirem mudas mais vigorosas, a simples operação de separação das sementes por classe de tamanho, eliminando-se as menores, conseqüentemente refletirá na obtenção de mudas sadias e vigorosas, traduzindo- se em crescimento mais rápido e maior produtividade. Para este estudo foi escolhida a essência Guapuruvu (Sohisolobium parahyba), por ser considerada uma das espécies nativas mais promissoras, devido a seu rápido crescimento e retilinidade do fuste, tendo aplicações em caixas, forros .pranchetas, palitos, canoas, aeromodelismo, brinquedos e utensílios que requerem madeira leve, porém resistente ao ataque de insetos. Além disso fonte promissora para fabricação de papel e laminados, de acordo com RIZZINI.
Memória hídrica (stress imprint) em sementes: impacto ecofisiológico na germinação e no crescimento inicial de Sesbania virgata (Cav.) Poir
(2024-03-11) Menezes, Mariane Oliveira; Santos, Marcone Moreira; Silva, Carlos Luiz da; http://lattes.cnpq.br/9191002336120487; http://lattes.cnpq.br/3284707164193715; http://lattes.cnpq.br/1484285198376822
The present study investigated the effects of hydraulic memory on the eco-physiological aspects of germination and the initial development of S. virgata seedlings. Employing a mixed-method approach that combined quantitative and qualitative methods, along with rigorous statistical analysis including tests such as Tukey, ANOVA, and regression analysis, a randomized experiment with various treatments was conducted. Initially, a literature review was conducted to understand the species' importance and the effects of hydraulic memory. Subsequently, laboratory tests were performed to overcome seed dormancy, determine moisture content, and establish the imbibition curve. Additionally, the germination rate of seeds subjected to polyethylene glycol 6000 (PEG 6000) solution was evaluated to simulate water stress, both with seeds that underwent intermittent hydration cycle (IHC) and those that did not undergo this process. Following laboratory analyses, nursery analyses were conducted with two distinct treatments (seeds subjected to IHC and seeds that did not undergo this process), under different watering regimes. Evaluated parameters included shoot height and diameter, root size, dry and fresh weight, Dickson's quality index, biomass allocation, and seedling survival rate. The results indicated the possible presence of hydraulic memory in the seedlings and demonstrated that water deficit negatively affects germination. However, intermittent hydration showed a positive effect on seed germination under water deficit conditions, offering a promising strategy to enhance plant survival in adverse environments.