Genotypic Variation in Iron-, and Aluminum-Phosphate Solubilizing Activity of Pigeonpea Root Exudates under P Deficient Conditions

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概要

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• The internal factors controlling the release of the solubilizing activity (for Fe-P and Al-P) in the root exudates of pigeonpea were investigated. Four pigeonpea genotypes with differential abilities in taking up P from Fe-P were grown in nutrient solution under optimum P and P-free conditions. Root exudates and plant samples were collected at weekly intervals; the solubilizing activity for Fe-P and Al-P was estimated. Plant samples were analyzed for total P and also for P fractions. The solubilizing activity in root exudates was revealed mostly under P-deficient conditions. Under P-optimum conditions, there was a negative activity. The solubilizing activity (for Fe-P and Al-P) was negatively correlated with tissue P levels. Various P fractions in leaves i.e. inorganic-P, soluble organic-P, and insoluble organic-P showed a significant negative correlation with the Fe-P and Al-P solubilizing activity. The Al-P solubilizing activity was correlated positively with the Fe-P solubilizing activity. In ICPL 88032, there was a 12 fold increase in the solubilizing activity under internal P deficiency, compared to the P-optimum status. Though, various genotypes used in the present study reached similar internal P levels by 9 weeks after sowing, there were significant differences in their solubilizing activities for Fe-P. In the genotypes ICPL 88032 and C 11 the Fe-P solubilizing activity was significantly higher compared to ICPL 88039 and ICPL 87. The solubilizing activity showed a declining trend towards pod-filling (i.e. 12 WAS). Genotypic differences in the Fe-P solubilizing activity of the root exudates could not account for their differential P uptake from Fe-P. The results indicated that the Fe-P solubilizing activity of the root exudates in pigeonpea is under genetic control and that its expression is possibly regulated by the internal P status and internal P demand which to some extent depend on the growth stages.

著者

• Subbarao Guntur

  Division Of Agronomy Icrisat Patancheru

• Otani Takashi

  National Hospital Organization Ehime National Hospital

• Ae Noriharu

  National Institute For Agro-environmental Sciences

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