Rhizosphere properties of rice genotypes as influenced by anoxia and availability of zinc and iron

Pesquisa Agropecuária Brasileira

Roghieh Hajiboland¹  Naier Beiramzadeh¹ 

[1] ,University of Tabriz Plant Science Department Tabriz,Iran

关键词: Oryza sativa;    alcohol dehydrogenase;    alpha-naphthylamine oxidation;    lactate dehydrogenase;    lowland genotype;    proton release;    upland genotype;    Oryza sativa;    álcool desidrogenase;    oxidação da alfa-naftilamina;    lactato desidrogenase;    várzea;    extrusão de prótons;    arroz de terras altas;   

DOI  :  10.1590/S0100-204X2008000500009

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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