Aluminium Tolerance Mechanisms in Phaseolus vulgaris L.: Citrate Synthase Activity and TTC Reduction Are Well Correlated with Citrate Secretion

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概要

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• We characterised the physiological mechanisms of tolerance in two bean varieties (Phaseolus vulgaris L. viz. French Bean cv. Amy and Rosecoco (GLP2)) differing in Al tolerance of the varietal level. Root elongation at varying levels of Al over time clearly showed the Al tolerance superiority of Rosecoco over French bean. Aluminium uptake was much higher in French bean, in both root apex and 2 mm region of the root apex. The root cation exchange capacity of the Al-sensitive French bean was markedly higher than that of Rosecoco. Citric acid was the only organic acid whose secretion was stimulated by Al and was higher in Rosecoco than in French bean. The citrate synthase and NADP^+ -isocitrate dehydrogenase activities were apparently higher in Rosecoco than in French bean but those of phsphoenolpyruvate carboxylase were not significantly different between the two varieties under Al stress. Triphenyl-tetrazolium chloride (TTC) reduction was greater in Rosecoco and was also well correlated with the citrate secretion. These results suggest the role of TTC reduction and citrate secretion as underlying factors in the Al toleranceme chanism of Rosecoco.

• 社団法人日本土壌肥料学会の論文

著者

• Agong Stephen

  Horticulture Department Jomo Kenyatta University Of Agriculture And Technology

• Matsumoto Hideaki

  Research Institute For Bioresources Okayama University

• Mugai Elisha

  Horticulture Department, Jomo Kenyatta University of Agriculture and Technology

• Mugai E

  Jomo Kenyatta Univ. Agriculture And Technol. Nairobi Ken

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