Data/hora: 02/06/2024 12:39:43

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 09/09/1996
Data da última atualização: | 09/09/1996
Autoria: | PILET, P. E.; ELLIOTT, M. C.
Título: | Some aspects of the control of root growth and georeaction: the involvement of indoleacetic acid and abscisic acid.
Ano de publicação: | 1981
Fonte/Imprenta: | Plant Physiology, v.67, p.1047-1050, 1981.
Idioma: | Inglês
Conteúdo: | Apical segments of roots of Zea mays L. cv. Anjou show a strong georeaction during 7 hours geostimulation. This is abolished by detipping the segment and restored by replacing the tips upon the apical cur surfaces. After exodiffusion of endogenous indoleacetic acid (IAA) the retipped segments showed a significantly lower geocurvature. Application of low concentrations of IAA to the basal cut surface of root segments from which endogenous IAA had not been allowed to exodiffuse increased the geocurvature of retipped Orla segments but decreased geocurvature of Anjou segments. At appropriate concentration basally applied IAA restored the georeaction capacity of root segments from which the endogenous auxin had exodiffused. The implications of the interaction between exogenous and endogenous IAA in the control of root georeaction are discussed with special reference to the normal role of endogenous IAA in the regulation of root georeaction and the variation in endogenous IAA content of roots of different cultivars of maize. The probability that the normal control of root growth and georeaction involves concomitat actions in the elongation zone of IAA moving preferentially in the acropetal direction and basipetally growth inhibitos (suc as abscisic acid) produced in the cap cells is stressed.
Palavras-Chave: | Acido absicisico; Controle; Indoleacetic acid; Plant.
Thesagro: | Crescimento; Planta; Raiz.
Thesaurus Nal: | abscisic acid; root growth.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (33004-1) - ADD - SP - -- - SP3247 -  - 3247 - DIS