Estudos morfo-anatômicos relacionados à dormência em sementes de Adesmia tristis Vogel (Fabaceae)

Ferreira, Nadilson Roberto; Franke, Lucia Brandão; Moço, Maria Cecília de Chiara

doi:10.1590/s0101-31222011000300007

Cited by 3 publications

(4 citation statements)

References 11 publications

(10 reference statements)

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“…It was evidenced that tracheoids presented a vertical arrangement (Figures 1F,2A and D). This standard is commonly found in fabaceous (Lersten, 1982), and it was observed in Adesmia tristes and other Fabaceae species (Ferreira et al, 2011).…”

Section: Genotypesmentioning

confidence: 79%

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Physiological quality, lignin and the ultrastructural characterization of soybean seeds

Castro,

Pinho,

Lima

et al. 2023

Acta Sci. Agron.

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In soybeans, the integument or seed coat is an important modulator between the external and internal environment. It plays a fundamental role in seed vitality, and its lignin content may influence the seed quality. The objective of this experiment was to evaluate the quality of soybean seeds from a partial diallel and their reciprocals and its relationship with lignin content, seed coat thickness, and deposition location. The seeds were also evaluated for physiological quality through germination and accelerated aging tests. The lignin content was quantified by absorbance, and the integument thickness was analyzed and measured using scanning electron microscopy. The most contrasting cultivars for lignin content were analyzed using fluorescence microscopy and histochemical techniques. Cultivars and their reciprocals differed in seed physiological quality. We found differences in the genotypes for integument thickness. Using histochemical techniques, autofluorescence was observed in the same regions identified as lignified. Positive staining for lignin was observed in the hilum region. Among the genotypes, we found variations in the physiological quality of seeds (germination and accelerated aging test), lignin content, and integument thickness.

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Section: Genotypesmentioning

confidence: 79%

“…According to Ferreira, Franke, and Moco (2011), macrosclereid cells (palisade) and osteosclereids (hourglass) present cell content rich in phenolic compounds such as lignin. However, for this research, no positive correlation between lignin content and hourglass cell thickness was found (Table 2).…”

Section: Genotypesmentioning

confidence: 99%

Physiological quality, lignin and the ultrastructural characterization of soybean seeds

Castro,

Pinho,

Lima

et al. 2023

Acta Sci. Agron.

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“…A partir das características anatômicas gerais observadas no tegumento das sementes de S. virgata, é possível concluir que estas, de acordo com a classificação de Corner (1976), se enquadram como sementes exotestais; caracterizadas por possuírem camadas de células mecânicas predominantemente face mais externa da testa. Sementes desse tipo são bastante comuns em espécies de Fabaceae como pode ser visto nos estudos com morfoanatomia de sementes de Adesmia tristes (Ferreira et al, 2011) e Amburana cearenses (Loureiro et al, 2013).…”

Section: Discussionunclassified

“…Adjacente às células paliçádicas, encontra-se um grupo de células subepidérmicas alongadas, com as extremidades alargadas que lembram a forma de um osso e denominam-se osteosclereides. Geralmente nestas células há a ocorrência de uma dupla camada de osteoesclereídes, uma vez que estas são comuns em sementes de leguminosas; como também uma camada externa e uma mais interna, que formam uma barreira dupla para a entrada de água e oxigênio na semente (Ferreira et al,2011). Entretanto, nas sementes de S. virgata não foram evidenciadas tais camadas.…”

Section: Discussionunclassified

GERMINAÇÃO E MODIFICAÇÕES ANATÔMICAS EM SEMENTES DE Sesbania virgata (CAV.) PERS. SUBMETIDAS À ESCARIFICAÇÃO QUÍMICA

et al. 2019

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Este trabalho teve como objetivo avaliar os efeitos da aplicação do ácido sulfúrico concentrado na germinação e possíveis alterações anatômicas tegumentar na superação de dormência das sementes de Sesbania virgata (Cav.) Pers. Para isto, foram utilizados oito diferentes tempos de exposição das sementes ao ácido sulfúrico (0, 15, 30, 45, 60, 120, 180 e 240 minutos), avaliando a porcentagem de germinação, índice de velocidade e o tempo médio de germinação. Além disso, para cada tempo de exposição, foi avaliado as alterações anatômicas das sementes. Foi possível descrever quatro diferentes estratos do tegumento (cutícula cerosa, camada de células paliçadas, osteosclereides e uma camada de células parenquimáticas). Os resultados sugerem que a aplicação do ácido sulfúrico de até 60 minutos é recomendada para superar a dormência de sementes de S. virgata, uma vez que aumenta a porcentagem de germinação e origina plântulas normais. Constatou-se também que a exposição das sementes de S. virgata ao ácido sulfúrico em períodos iguais ou superiores a 120 minutos, promove a geração de novas plântulas anormais, além de desestruturar os estratos do tegumento e causar danos diretos a camada de aleurona e endosperma.

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Induction of seed coat water impermeability during maturation of Erythrina speciosa seeds

2020

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Abstract: Dormancy is a physiological process that allows seeds to survive in unfavorable environments by preventing their germination. For a large number of species, seed desiccation at the end of maturation is common, and for some of these seeds, this includes seed coat water impermeability (SCWI). The environmental conditions in which the mother plant develops affect the seed maturation process, causing variations in both seed physiological quality and the onset of physical dormancy. In this study, we analyzed the induction of SCWI in immature seeds of Erythrina speciosa by artificial drying. Seeds at three stages of immaturity were dried gradually for subsequent evaluation of their germination. At each level of drying, the anatomical structure of the seed coat was also analyzed. Artificial drying was able to induce SCWI in immature seeds. Furthermore, environmental conditions affected at which stage of maturity SCWI began, and they affected development of desiccation tolerance. However, unlike other species, there were no anatomical differences related to this SCWI (whether by natural drying or artificial drying) and, therefore, in E. speciosa seeds, SCWI may be related to biochemical differences in the seed coat.

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Estudos morfo-anatômicos relacionados à dormência em sementes de Adesmia tristis Vogel (Fabaceae)

Cited by 3 publications

References 11 publications

Physiological quality, lignin and the ultrastructural characterization of soybean seeds

Physiological quality, lignin and the ultrastructural characterization of soybean seeds

GERMINAÇÃO E MODIFICAÇÕES ANATÔMICAS EM SEMENTES DE Sesbania virgata (CAV.) PERS. SUBMETIDAS À ESCARIFICAÇÃO QUÍMICA

Induction of seed coat water impermeability during maturation of Erythrina speciosa seeds

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