Physiological mechanism of increasing lateral roots of Phaseolus coccineus L.under P deficiency
To determine function of IAA in root formation under P deficiency stress,a hydroponic experiment was conducted to study the relationship between IAA-oxidase and root architecture by using exogenous IAA and TIBA,clarifying their specific role in root architecture of Phaseolus coccineus L.under P deficiency.The results show that indole-3-acetic acid has crucial functions in the process of lateral formation by increasing lateral roots,while auxin polar translation inhibitor TIBA has drastic reduction of lateral roots.The activities of IAA metabolism-related enzymes,IAAO and POD,are regularity in forming process of root system morphogenesis,and the activities of IAAO and POD of root tissues under the P deficiency are higher than those under the P sufficient solution.The exogenous IAA could up-regulate the activities of these two enzymes which are significantly restrained by TIBA.
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