Abstract
Of 82 strains of endophytic actinomycetes isolated from rhododendron plants, 12 were not antagonistic against Pestalotiopsis sydowiana, which is the causal agent of Pestalotia disease. Of these 12, MBR-37 and MBR-38 (identified as Streptomyces spp.) grew on IMA-2 medium. Tissue-cultured seedlings of rhododendron treated with these nonantagonistic strains showed less wilting and/or smaller lesions to P. sydowiana, although the degree of resistance was a little lower than that conferred by antagonistic Streptomyces galbus strain R-5. These seedlings accumulated the anthocyanin(s), suggesting that resistance induced by these strains could depend on activated defense responses associated with the phenylpropanoid pathway rather than with antibiosis.
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Shimizu, M., Meguro, A., Hasegawa, S. et al. Disease resistance induced by nonantagonistic endophytic Streptomyces spp. on tissue-cultured seedlings of rhododendron. J Gen Plant Pathol 72, 351–354 (2006). https://doi.org/10.1007/s10327-006-0305-9
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DOI: https://doi.org/10.1007/s10327-006-0305-9