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Genotypic difference in responses to iron deficiency of Glycine max

Liu Shujuan, Zhang Fusuo, Mao Daru

Department of Plant Nutrition,Beijing Agricultural University.Beijing 100094

Abstract

Genotypic differences in iron deficiency responses were studied using two soybean genotypes in nutrient solution under controlled environmental conditions. The results showed that there was no significant difference in pH in the rhizosphere of Fe-inefficient genotype "HA83" between plus Fe and minus Fe, whereas the difference of Fe-efficient genotype "8701: was more than 1.5 pH units.Similar results were obtained by measuring the reducing capacity of the root, where the Fe-efficient genotype had much higher reducing capacity in roots than the inefficient genotype. The addition of H~(+)-ATPase inhibitior vanadate (Na_(3)VO_(4) to Fe-deficient plants depressed simultaneously the proton release of roots and the reducing capacity. This result supports the hypothesis about the cooperative functioning system between proton pump and Fe~(3+) reductase on the plasma membrane of Fe-deficient root cells.

Key words: Glycine max;Fe-deficiency stress;Adapactive mechanisms;PMH~(+)-ATPase;PM reductase

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Citing This Article：

Liu Shujuan, Zhang Fusuo, Mao Daru. Genotypic difference in responses to iron deficiency of Glycine max. Acta Physiol Sin 1996; 48 (1): (in Chinese with English abstract).