Tolerância à dessecação em sementes

Barbedo, Cláudio José; Marcos Filho, Júlio

doi:10.1590/S0102-33061998000200005

Resumos

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.

recalcitrante; armazenamento; conservação de sementes

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.

recalcitrant; storage; seed conservation

Tolerância à dessecação em sementes

Desiccation tolerance on seeds

Cláudio José Barbedo^I; Júlio Marcos Filho^II

^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.

Recebido em 17/03/98.

Aceito em 8/06/98

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Berry, T. & Bewley, J. D. 1991. Seeds of tomato (Lycopersicon esculentum Mill.) which develop in a fully environment in the fruit switch from a developmental to a germinative mode without a requirement for desiccation. Planta 186: 27-34.
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Datas de Publicação

Publicação nesta coleção
06 Jun 2011
Data do Fascículo
Ago 1998

Histórico

Aceito
08 Jun 1998
Recebido
17 Mar 1998

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

[1] Adams, C. A.; Fjerstad, M. C. & Rinne, R. W. 1983. Characteristics of soybean seed maturation: necessity for slow dehydration. Crop Science 23: 265-267.

[2] Araújo, E. F.; Silva, R. F. & Araújo, R. F. 1994. Avaliação da qualidade de sementes de açaí armazenadas em diferentes embalagens e ambientes. Revista Brasileira de Sementes 16: 76-79.

[3] Araújo, E. F. & Barbosa, J. G. 1992. Influência da embalagem e do ambiente de armazenamento na conservação de sementes de palmeira (Phoenix loureiri Kunth.). Revista Brasileira de Sementes 14: 61-64.

[4] Barbedo, C. J. 1997. Armazenamento de sementes de Inga uruguensis Hook. & Arn. Tese de Doutorado. Universidade de São Paulo. Piracicaba.

[5] Bartels, D.; Singh. M. & Salamini, F. 1988. Onset of desiccation tolerance during development of the barley embryo. Planta 175: 485-492.

[6] Berjak, P. & Pammenter, N. W. 1994. Recalcitrant is not an all-or-nothing situation. Seed Science Research 4: 263-264.

[7] Berjak, P.; Dini, M. & Pammenter, N. W. 1984. Possible mechanisms underlying the differing dehydration responses in recalcitrant and orthodox seeds: desiccation-associated subcellular changes in propagules of Avicennia mcirina. Seed Science and Technology 12: 365-384.

[8] Berjak, P.; Farrant, J. M.; Mycock, D. J. & Pammenter, N. W. 1990. Recalcitrant (homoiohydrous) seeds: the enigma of their desiccation-sensitivity. Seed Science and Technology 18: 297-310.

[9] Berjak, P.; Pammenter, N. W. & Vertucci, C. 1992. Homoiohydrous (recalcitrant) seeds: developmental status, desiccation sensitivity and the state of water in axes of Landolphia kirkii Dyer. Planta 186: 249-261.

[10] Berjak, P.; Bradford, K. J.; Kovach, D. A. & Pammenter, N. W. 1994. Differential effects of temperature on ultrastructural responses to dehydration in seeds of Zizania palustris. Seed Science Research 4: 111-121.

[11] Berry, T. & Bewley, J. D. 1991. Seeds of tomato (Lycopersicon esculentum Mill.) which develop in a fully environment in the fruit switch from a developmental to a germinative mode without a requirement for desiccation. Planta 186: 27-34.

[12] Bewley, J. D. & Black, M. 1985. Seeds: physiology of development and germination. Plenum Press. New York.

[13] Bewley, J. D.; Kermode, A. R. & Misra, S. 1989. Desiccation and minimal drying treatments of seeds of castor bean and Phaseolus vulgaris which terminate development and promote germination cause changes in protein and messenger RNA synthesis. Annals of Botany 63: 3-17.

[14] Bilia, D. A. C. 1997. Tolerância à dessecação e armazenamento de sementes de Inga uruguensis. Hook, et Arn. Universidade de São Paulo. Piracicaba.

[15] Blackmail, S. A.; Wettlaufer, S. H.; Obendorf, R. L. & Leopold, A. C. 1991. Maturation proteins associated with desiccation tolerance in soybean. Plant Physiology 96: 868-874.

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