Data/hora: 07/06/2024 21:38:20

Biblioteca(s): | Embrapa Agroindústria Tropical.
Data corrente: | 02/03/1994
Data da última atualização: | 02/03/1994
Autoria: | COOPER, W. C.; RASMUSSEN, G. K. : ROGERS, B. J.; REECE, P. C.; HENRY, W. H.
Título: | Control of abscission in agricultural crops and its physiological basis.
Ano de publicação: | 1968
Fonte/Imprenta: | Plant Physiology, v.43, p.1560-1576, 1968.
Idioma: | Inglês
Conteúdo: | ABSTRACT. Some naphthalene and phenoxy compounds prevent preharvest drop of apples, pears, and citrus fruits. These studies have been complicated by an unrecognized high level of ethylene produced by leaves and fruit on trees sprayd with these growth regulators. An apparent contradictions is the effectiveness of both 2,4-dichlorophenoxyacetic acid and N-dimethylaminosuccianamic acid (a growth retardant which retards biosynthesis of auxin) in preventing abscission of apples. Thus, in the presence of low auxin concentrations in the tissue, this growth retardant prevents fruit abscission even more effectively than 2,4-dichlorophenoxyacetic acid at high auxin concentrations in the tissue. This anomaly is clarified on the basis that N-dimethylaminosuccinamic acid, in the presence of a known low ethylene biosynthesis, delays maturity of the fruit and thus and thus prevents fruit abscission. On the other hand, 2,4-dichlorophenoxyacetic acid prevents abscission by direct growth hormone action, in spite of the side effects of ethylene production which speeds ripening of the fruit. With the promotion of abscission of leaves and fruit of agricultural crops, attention is given to the use of chemicals which induce ethylene production when applied to the plant, but which have no growth promotion effect to retard abscission. We can distinguish 5 kinds of such chemicals.
Palavras-Chave: | Fitoreguladores; Fruto - abscissao.
Thesagro: | Fisiologia; Frutificação.
Categoria do assunto: | --
Registro original: | Embrapa Agroindústria Tropical (CNPAT)
Exemplares: | CNPAT - (890-1) - EMB - SP - -- - SP 01343 -  - 93.01343 - DIS