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Acta Botanica Brasilica

Print version ISSN 0102-3306

Acta Bot. Bras. vol.12 no.2 Feira de Santana May/Aug. 1998

https://doi.org/10.1590/S0102-33061998000200005 

Tolerância à dessecação em sementes

 

Desiccation tolerance on seeds

 

 

Cláudio José BarbedoI; Júlio Marcos FilhoII

IInstituto de Botânica, C. Postal 4005, CEP 01061-970, São Paulo, SP
IIESALQ, USP, Av. Pádua Dias 11, C. Postal 9, CEP 13418-900, Piracicaba, SP, Brasil. Bolsista do CNPq

 

 


RESUMO

São apresentadas algumas considerações sobre a tolerância das sementes à dessecação, analisando-se os principais trabalhos desenvolvidos com sementes ortodoxas e recalcitrantes. São levantados aspectos considerados importantes no entendimento desta tolerância, como as fases de desenvolvimento e de germinação das sementes, a participação do ácido abscísico, do DNA, de RNAs, de proteínas e de açúcares, as propriedades da água, os radicais livres e particularidades das sementes recalcitrantes. São feitas considerações quanto a perspectivas de ação na área.

Palavras-chave: recalcitrante, armazenamento, conservação de sementes


ABSTRACT

Some comments on desiccation tolerance of seeds are presented, with analysis of the main works carried out with orthodox and recalcitrant seeds. It was analysed the aspects that are considered important on this tolerance, as seed developing and germination stages, abscisic acid, DNA, RNAs, proteins, sugars, water properties, free radicals and particularities of recalcitrant seeds. Some action perspectives on this issue are presented.

Key words: recalcitrant, storage, seed conservation


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

 

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Recebido em 17/03/98.
Aceito em 8/06/98

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