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Effect of Alcaligenes faecalis on the redox properties of rice roots and level of phytohormone in the endorhi zosphere

Lin Min, You Chongbiao

Institute for Application of Atomic Energy, Chinese Academy of Agricultural Sciences. Beijing

Abstract

Inoculation of rice plant with associative diazotroph A. faecalis A1501 (wild type) enhanced redox ability of rice roots, stimulated superoxide dismutase(SOD)activity, and increased resistance of rice seedlings against high or low temperature in laboratory and field experiments. Inoculation might also decrease polyphenol oxidase and increased the content of polyphenolics in rice seedlings. Extracts of polyphenolics from inoculated rice roots could stimulate N_(2)-fixing activity and chemotaxis of A. faecalis. Strain A1501(nif~(+)) and mutant A1506(Nif~(-)) changed the level of phytohormone, increased the content of IAA and Z in the endorhizosphere, and promoted the growth of rice plants. The number of lateral roots and root hairs of inoculated rice plants were much higher than that of the control.

Key words: Rice rhizoplane;Alcaligenes faecalis;Superoxide dismutase(SOD);Polyphenolics;Phytohomone

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Citing This Article：

Lin Min, You Chongbiao. Effect of Alcaligenes faecalis on the redox properties of rice roots and level of phytohormone in the endorhi zosphere. Acta Physiol Sin 1994; 46 (3): (in Chinese with English abstract).