Data/hora: 22/06/2024 02:35:45

Biblioteca(s): | Embrapa Cerrados.
Data corrente: | 12/07/2002
Data da última atualização: | 12/07/2002
Autoria: | ANDRADE, L. R. M. de; IKEDA, M.; ISHIZUKA, J.
Título: | Effect of nitrogen sources on aluminium toxicity in wheat varieties differing in tolerance to aluminum.
Ano de publicação: | 1996
Fonte/Imprenta: | Soil Sci Plant Nutr., v. 42, n. 3, p. 651-657, 1996.
Idioma: | Inglês

Conteúdo:

As previously reported (Taylor and Foy 1985; Keltjens and Ulden 1987; Grauer and Horst 1990; Galvez and Clark 1991), plant species and varietes widely differ in Al tolerance. Although many hyphotyeses about the physiological mechanism (s) has not been elucidated. However, it is obvious that when exposed to Al at high concentrations. Al- Tolerant plants seem to be able to avoid the toxicity by refraining from excess uptake of Al or by chelating of Al in the rhizosphere or in the roots. In such ways, Al can not affect the growth of tolerant plants (Foy et al. 1978).
Differences in anion and cation uptake of nitrogen, NO3 - and NH4+ on the Al tolerance among varieties of some plant species has been investigated (taylor and Foy 1985; Keltjes and Ulden 1987; Grauer and Horst 1990; Galvez and Clark 1991). However, it was suggested that further studies on the complex relattion among N source, Rhizosphere pH-changes, and differential Al tolerance would be necessary.
In the investigation of differential Al tolerance in wheat,  the hematoxylin staining method (Polle et al. 1978) has been frequenty used for the visualization of  Al in root  on the surface of plant roots and for the  histochemical localization of Al on root tissues( Rincon and Gonzales 1992; Ownby 1993). In short-term experiments, the method was useful to evolutade the difference in Al tolerance among wheat varietes based on the pattern of root tip staining by hematoxylin after exposure to Al (Takagi el al. 1983; Wheeler et al. 1992)
This study was carried out to anlyze the relations among Al damge preferential uptake of nitrogen, solution pH changes, and the ability of the hematoxylin method to identify differential Al tolerance of wheat plants.

Thesagro: | Alumínio; Cerrado; Nitrogênio.
Thesaurus Nal: | nitrogen.
Categoria do assunto: | --
Registro original: | Embrapa Cerrados (CPAC)
Exemplares: | CPAC - (21496-1) - UPC - SP - -- - CRI5934 -  -  - DIS