Condicionamento fisiológico na germinação e no vigor de sementes armazenadas de café

Braz, Madelon Rodrigues Sá; Rossetto, Cláudia Antônia Vieira

doi:10.1590/s0103-84782008000700008

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…The process of coffee germination has been studied (Sales et al, 2003;Braz and Rossetto, 2008), for the time period required for its assessment, 30 days, is considered long, because, when the results are reported, there has been already a variation in the seed quality.…”

Section: Introductionmentioning

confidence: 99%

Minimum period to assess the potential of germination of coffee seeds

et al. 2013

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In recent research, early stages of coffee seedling development were identified, after radicle protrusion, in which all the essential parts of the seedling can be assessed to demonstrate the potential of seed germination to generate normal plants. Thus, the objective of this research was to develop studies to reduce the time on the germination test. Ten seed lots of coffee were assessed through the germination test, every two days, from the tenth day of sowing, according to the morphological criteria of the seedlings. The data were compared to the standard germination test and analyzed by means of regression analysis and segmented nonlinear regression and planteau response model. It was concluded that the assessment of coffee seedlings at 16 days, in stage S1, provides the similar result of the pattern germination test, allowing a significant reduction of time in order to demonstrate the germination of the seed lots; the seedling assessment coffee in stage S2 does not have reduction of the time for assessing the coffee germination, in relation to the pattern.

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Section: Introductionmentioning

confidence: 99%

Minimum period to assess the potential of germination of coffee seeds

et al. 2013

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“…Para isto, vem sendo aplicados vários tratamentos de pré-semeadura denominados de condicionamento fisiológico (MARCOS FILHO, 2005). Dentre eles, a técnica de hidratação controlada seguida por secagem tem mostrado resultados satisfatórios para varias espécies (BRAZ; ROSSETTO, 2008;FAROOQ et al, 2010;GHASSEMI-GOLEZANI et al, 2010). Esta técnica, alem de ser simples e não empregar reagentes ou equipamentos sofisticados, permite o reparo metabólico das sementes durante o processo de hidratação, o que reduz os níveis de deterioração e favorece o processo de germinação (HARRIS et al, 2001).…”

Section: Introductionunclassified

“…Em pinhão manso, Pinto et al (2009) constataram que a imersão em água visando atingir 40% de água nas sementes apresentou aumento na porcentagem de sementes viáveis avaliadas pelo teste de tetrazólio. Em outras espécies também tem sido encontrados resultados favoráveis desta técnica na germinação (BRAZ; ROSSETTO, 2008;CASEIRO;BENNETT;MARCOS FILHO., 2004) e no período médio de germinação de sementes envelhecidas (THORNTON;POWELL, 1995).…”

Section: Introductionunclassified

Hidratação controlada de sementes de pinhão manso

Braga¹,

Morais²,

Rossetto³

2012

Rev. Ciênc. Agron.

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RESUMO -A hidratação controlada pode favorecer a germinação e o estabelecimento das plantas de diversas espécies. O objetivo desse trabalho foi avaliar o efeito do condicionamento fisiológico pela técnica da hidratação controlada seguida de secagem na qualidade fisiológica e no estabelecimento de plantas de pinhão manso. Por lote, foi estabelecida a curva de absorção de água pelas sementes. Posteriormente, as sementes foram imersas em água destilada (8 mL g -1 ), secas a 32 o C até atingir teor de água próximo ao inicial e submetidas aos testes de germinação e de vigor (primeira contagem, classificação de plântulas e emergência de plântulas em areia). Em casa de vegetação, as sementes foram distribuídas entre substrato plantmax. De acordo com resultados pode-se concluir que a hidratação promoveu o aumento do comprimento e da massa seca de plântulas e favoreceu a emergência de plântulas de pinhão manso. A sobrevivência das plantas provenientes apenas de sementes de qualidade fisiológica intermediária é beneficiada pela hidratação das sementes de pinhão manso.Palavras-chave: Jathorpha curcas L. Plantas e água. Germinação.ABSTRACT -Controlled hydration can promote the germination and establishment of the plants of various species. The aim of this study was to evaluate the effect of priming, using a technique of controlled hydration followed by drying, on the physiological attributes and establishment of jatropha plants. The water-absorption curve was established per batch of seeds. Subsequently, the seeds were immersed in distilled water (8 mL g -1 ), dried at 32 °C until a water content close to the initial levels was reached, and subjected to tests for germination and vigor (initial counting, seedling classification, and the emergence of seedlings in sand). In the greenhouse, seeds were distributed in a plantmax substrate. From the results it can be concluded that hydration promotes an increase in the length and dry matter of seedlings, and favors the emergence of Jatropha seedlings. The survival of plants from seeds with only intermediate physiological attributes, benefits from the hydration of Jatropha seeds.

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Biospeckle activity in coffee seeds is associated non‐destructively with seedling quality

Vivas

Resende

Braga

et al. 2016

Annals of Applied Biology

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Seeds age during storage, resulting in a decline in germination and seedling quality. Seed quality tests are important to monitor this decline. However, such tests are usually destructive and require large seed numbers and long time. For coffee seeds the standard germination test and assessment of seedling quality takes 30 days. Biospeckle has been used previously as a non‐destructive optical tool to monitor biological activity in a range of tissues. Biospeckle was applied 3–6 days after imbibition (DAI) to investigate an association with coffee seedling quality after 30 days. Two distinct areas of biospeckle activity were demonstrated, concurring with the locations of the embryonic axis and the cotyledons in the apical and central seed parts, respectively. Moisture content analysis revealed that embryos of imbibed seeds contained more water than endosperm. Different areas within the endosperm did not differ in moisture content, while the moisture content of the axis was higher than that of the cotyledons, and this did not change from 4 DAI. Therefore, it was concluded that high biospeckle activity was not the result of increased water content in any seed part, but more likely of growth and metabolism in the axis and cotyledons, which had been described previously. A threshold biospeckle ratio apical : central of 1.02 after 6 days distinguished between seeds that produced dead and viable seedlings after 30 days and provided similar results as a tetrazolium test, a widely acknowledged but destructive test for seed quality. Thus, biospeckle data provided a non‐destructive early parameter for seedling quality, based on embryo growth during germination.

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Condicionamento fisiológico na germinação e no vigor de sementes armazenadas de café

Abstract: II Condicionamento

Cited by 4 publications

References 6 publications

Minimum period to assess the potential of germination of coffee seeds

Minimum period to assess the potential of germination of coffee seeds

Hidratação controlada de sementes de pinhão manso

Biospeckle activity in coffee seeds is associated non‐destructively with seedling quality

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