Data/hora: 02/06/2024 13:47:39

Biblioteca(s): | Embrapa Meio-Norte.
Data corrente: | 11/04/1997
Data da última atualização: | 11/04/1997
Autoria: | HARTUNG, W.; ZHANG, J.; DAVIES, W. J.
Título: | Does abscisic acid play a stress physiological role in maize plants growing in heavily compacted soil?
Ano de publicação: | 1994
Fonte/Imprenta: | Journal of Experimental Botany, v. 45 n. 271, p. 221-226, Feb., 1994.
Idioma: | Inglês
Conteúdo: | When roots of young maize seedings are forced to penetrate soil of high mechanical impedance, abscisc acid (ABA) concentration in the xylem sap can be increased by up to 10-fold. After a further 8-10 d, however, this increase disappears nearly completely. Leaf growth rate was inhibited in plants in compacted soil and showed a good relationship with ABA concentration in the xylem. The early large increase of ABA concentration in the xylem. The early large increase of ABA in xylem coincided with the reduction of leaf water potential and turgor which also gradually disappeared when plants became established. With only one layer of compacted soil in the middle of the soil profile, a similar situation to that in compacted field plots, plant leaf growth was not affected as long as the soil was well watered. Exogenous ABA induced morphological and anatomical changes which may facilitate penetration of roots through compacted soil.
Palavras-Chave: | Acido absisico; Compactacao; Hormonal stress signals; Mechanical impedance; Xylem sap.
Thesagro: | Fisiologia Vegetal; Solo; Zea Mays.
Thesaurus Nal: | abscisic acid; roots.
Categoria do assunto: | --
Registro original: | Embrapa Meio-Norte (CPAMN)
Exemplares: | CPAMN - (3334-1) - ADC - SP - -- - S 10642 -  - S 10642 - DIS