Effect of endophytic actinomycetes on plant growth was investigated. Crop seeds were bacterized with the spores of endophytic actinomycetes and grown in a green house. Of the tested microorganisms, Streptomyces hygi-oscopicus S-17 induced the significant growth promotion of tomato ca 2 times in height and ca 8 times in fresh weight compared to the control. One of the secondary metabolites, pteridic acid A showed growth promotion in the root formation test of kidney bean hypocotyls and the tobacco BY-2 cell culture.
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