60. 植物内生放線菌二次代謝産物の植物生長調節活性

概要

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Although the endophytic actionomycetes produce a wide variety of secondary metabolites, biological significance of such metabolites in plant-microbe community is open to question. Recently, we have found that endophytic actinomycetes promote the plant growth by seed bacterization. For example, in the case of tomato, 10 of 13 tested actinomycetes substantially promoted the growth 2 to 2.5 times higher than the control after three weeks cultivation. In this study, among ten actinomycetes that promote the tomato growth, three strains were chosen and their secondary metabolites were analyzed by HPLC. Interestingly, 6-prenylindole and ansamycins such as geldanamycin, herbimycin and TAN420 were produced by three strains and azalomycin B and clethramycin by two strains, indicating an overlap of the secondary metabolites production pattern. Surprisingly, in rice seed germination test, these compounds showed similar activity pattern that the germination was inhibited at higher concentrations (100∿1,000ppm) and the root and shoot growth was promoted at lower concentrations (1∿10ppm). These finding, together with the growth promotion effect obtained by seed bacterization, implicates a possible role of actinomycete secondary metabolites in plant growth regulation.
植物化学調節学会の論文
2003-10-10