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Provedor de dados:  PAB
País:  Brazil
Título:  Rhizosphere properties of rice genotypes as influenced by anoxia and availability of zinc and iron
Autores:  Hajiboland,Roghieh
Data:  2008-05-01
Ano:  2008
Palavras-chave:  Oryza sativa
Alcohol dehydrogenase
Alpha-naphthylamine oxidation
Lactate dehydrogenase
Lowland genotype
Proton release
Upland genotype
Resumo:  The objective of this work was to study possible mechanisms involved in root-induced changes of rhizosphere physicochemical properties of rice genotypes, under anoxia and low supply of Zn and Fe. Two rice genotypes, including an upland and a lowland ones, were grown in hydroponic medium under adequate and low supply of Zn and Fe, with or without aeration. Anoxia increased shoot dry weight, root length and uptake of Zn and Fe in lowland Amol genotype, but reduced these parameters in upland Gasrol-Dashti genotype. The amount of oxygen released by roots was statistically higher in 'Amol'. The highest acidification potential of roots was observed in the lowland genotype under low supply of Zn, and in the upland genotype under Fe starvation. The highest oxalate (only organic acid detected) exudation from roots was observed in Zn and Fe deficient Gasrol-Dashti genotype. Zinc deficiency caused reduction of alcohol dehydrogenase and stimulation of lactate dehydrogenase activity, particularly in shoot. The ability to induce changes in the rhizosphere properties has a great contribution for the adaptation of both lowland and upland rice genotypes to specific soil conditions.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira
Relação:  10.1590/S0100-204X2008000500009
Formato:  text/html
Fonte:  Pesquisa Agropecuária Brasileira v.43 n.5 2008
Direitos:  info:eu-repo/semantics/openAccess

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