Disease resistance induced by nonantagonistic endophytic Streptomyces spp. on tissue-cultured seedlings of rhododendron

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...

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Bibliographic Details
Published in:Journal of general plant pathology : JGPP 2006-12, Vol.72 (6), p.351-354
Main Authors: Shimizu, M.(Mie Univ., Tsu (Japan). Faculty of Bioresources), Meguro, A, Hasegawa, S, Nishimura, T, Kunoh, H
Format: Article
Language:English
Subjects:
ANTAGONISM
ANTAGONISME
ANTAGONISMO
CULTIVO DE TEJIDOS
CULTURE DE TISSU
DEFENCE MECHANISMS
Disease
DISEASE RESISTANCE
ENDOFITAS
ENDOPHYTE
ENDOPHYTES
Flowers & plants
Immunology
INDUCED RESISTANCE
MECANISME DE DEFENSE
MECANISMOS DE DEFENSA
PESTALOTIOPSIS
RESISTANCE AUX MALADIES
RESISTANCE INDUITE
RESISTENCIA A LA ENFERMEDAD
RESISTENCIA INDUCIDA
RHODODENDRON
Seedlings
STREPTOMYCES
TISSUE CULTURE
Wilting
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Summary: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. [PUBLICATION ABSTRACT]
ISSN:1345-2630
1610-739X
DOI:10.1007/s10327-006-0305-9