数字农科院2.0

Antagonistic Activity Against Rice Blast Disease And Elicitation Of Host-Defence Response Capability Of An Endophytic Streptomyces Albidoflavus Osilf-2

文献类型： 外文期刊

作者： Xu, T.;Zeng, J. R.;Zhu, Z. Y.;Zhu, Y. H.;Liu, X. M.;Ren, B.;Shi, L. M.;Zhou, Q.;Zhou, G. Y.;Zeng, X. D.;Gao, Y.;Yang, Y. Z.;Hu, X. C.

作者机构：

关键词： active metabolites; biological control; induced systemic resistance; Magnaporthe oryzae; rice endophyte; Streptomyces albidoflavus

期刊名称： Plant Pathology

ISSN： 0032-0862

年卷期： 2020 年 69 卷 2 期

页码：

收录情况： JCR（2021版）

摘要： Rice blast, caused by the fungus Magnaporthe oryzae, can result in notable yield losses in rice production. The objec-tive of this study was to investigate the potential of a rice endophytic isolate, Streptomyces albidoflavus OsiLf-2, onthe control of rice blast and the possible mechanisms involved. In vitro assays displayed a variety of antagonistic effectsof OsiLf-2 against different physiological races of M. oryzae, with peak mycelial growth inhibition ranging from74.1% to 83.0%. In vivo tests of OsiLf-2 showed 18.0% and 19.6% reduction in disease index in greenhouse and fieldconditions, respectively. The stable active metabolites in its cell-free culture filtrate inhibited the mycelial growth, sporegermination and appressorial formation of M. oryzae in a dose-dependent manner. They also possessed strong antifun-gal capacities toward various phytopathogens in vitro. OsiLf-2 secreted multiple antimicrobial compounds, cell walldegradation enzymes, siderophore, plant hormones, and 1-aminocyclopropane-1-carboxylate deaminase, which mightfunction in direct or indirect resistance to M. oryzae. In addition, a variety of defence responses were induced in OsiLf-2-treated rice, including hydrogen peroxide (H2O2) accumulation, callose deposition, defence-related enzymes activa-tion, and elevated expression of salicylic acid (SA) and jasmonic acid (JA) pathways genes, which might contribute inresisting pathogen attack. The significant biological control activity and host defence-stimulation ability of OsiLf-2 sug-gest that this endophytic actinobacterial strain could be a promising candidate in the management of rice blast disease.

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