Data/hora: 01/06/2024 00:36:54

Biblioteca(s): | Embrapa Semiárido.
Data corrente: | 25/05/2018
Data da última atualização: | 25/05/2018
Autoria: | LIMA, A. T.; CUNHA, P. H. de J. da; DANTAS, B. F.; MEIADO, M. V.
Afiliação: | AYSLAN TRINDADE LIMA, Mestrando da UFS; PAULO HENRIQUE DE JESUS DA CUNHA, UFS; BARBARA FRANCA DANTAS, CPATSA; MARCOS VINICIUS MEIADO, UFS.
Título: | Does discontinuous hydration of Senna spectabilis (DC.) H.S. Irwin & Barneby var. excelsa (Schrad.) H.S. Irwin & Barneby (Fabaceae) seeds confer tolerance to water stress during seed germination?
Ano de publicação: | 2018
Fonte/Imprenta: | Journal of Seed Science, , v. 40, n. 1, p. 36-43, 2018.
DOI: | 10.1590/2317-1545v40n1182838
Idioma: | Inglês
Conteúdo: | Seed hydration memory is the ability of seeds to retain biochemical and physiological changes caused by discontinuous hydration. This study aimed to determine if Senna spectabilis (DC.) H.S. Irwin & Barneby var. excelsa (Schrad.) H.S.Irwin & Barneby (Fabaceae) present seed memory and evaluate the effects of hydration and dehydration cycles (HD) on the seed germination of this species when submitted to conditions of water stress. Seeds underwent HD cycles (0, 1, 2 and 3 cycles) corresponding to the hydration times X (6 hours), Y (16 hours) and Z (24 hours), determined from the imbibition curve, with 5 hours of dehydration and submitted to water stress conditions. Germination was evaluated at 0.0, -0.1, -0.3, -0.6 and -0.9 MPa, obtained with polyethylene glycol 6000 solution. Germinability (%), mean germination time (days) and hydrotime (MPa d-1) were calculated. The seeds of S. spectabilis var. excelsa are sensitive to the low osmotic potentials tested in this study, however, when submitted to the HD cycles of 16 hours hydration (time Y), the tolerance to water stress conditions is increased. In addition, the observed benefits on the evaluated germination parameters show that S. spectabilis var. excelsa present seed hydation memory.
Palavras-Chave: | Bioma; Estresse hídrico; Planta da Caatinga; Senna spectabilis.
Thesagro: | Canafístula; Germinação; Semente.
Thesaurus Nal: | Natural resources.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
Registro original: | Embrapa Semiárido (CPATSA)
Exemplares: | CPATSA - (57395-1) - UPC - AP - DD -  -  -  - DIS