文献类型： 外文期刊

作者： Long, Meimei ¹ ; Wang, Qiuyue ² ; Li, Shanshan ¹ ; Liu, Changyun ¹ ; Chen, Shan ¹ ; Yang, Yanhui ¹ ; Ma, Haoyue ¹ ; Guo, Lulu ¹ ; Fan, Guangjin ¹ ; Sun, Xianchao ¹ ; Ma, Guanhua ¹ ;

作者机构： 1.Southwest Univ, Coll Plant Protect, Chongqing Key Lab Plant Dis Biol, Chongqing, Peoples R China

2.Chongqing Acad Agr Sci, Inst Characterist Crops, Chongqing, Peoples R China

3.Southwest Univ, Coll Plant Protect, Chongqing 400716, Peoples R China

关键词： biocontrol; Streptomyces XJC2-1; phytophthora pathogens; capsicum annuum; inducement mechanisms; pepper blight; dimethomorph

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：3.8； 五年影响因子：4.3 ）

ISSN： 1526-498X

年卷期： 2023 年

页码：

收录情况： SCI

摘要： BackgroundPepper blight, caused by Phytophthora capsici, is a destructive soilborne disease, which poses a serious threat to pepper, Capsicum annuum L., production. Chemical fungicides, which mainly are used to control pepper blight, have a negative effect on the environment, rendering biological control as a promising alternative to maintain the balance between ecology and pest management. The purpose of this study was to screen the biocontrol bacteria, reduce the dosage of fungicides and increase the stability of biocontrol bacteria, and to find the mixing ratio of biocontrol bacteria and fungicides giving the best control effect. ResultsWe isolated actinomycetes strains from the soil surrounding the roots of healthy pepper plants amongst field-grown plants infected with P. capsici. Of these, Streptomyces albus XJC2-1 showed a strong inhibition effect on the growth of P. capsici, with an inhibition rate of <= 85%. XJC2-1 effectively inhibited the formation of sporangium and release of zoospores of P. capsici as well as directly destroyed its hyphae, to achieve the inhibitory effect. Transcriptomic profiling of pepper leaves, postirrigation of plants with the XJC2-1 fermentation broth, revealed upregulation of genes related to the photosynthesis pathway in pepper. Furthermore, XJC2-1 treatment improved the net photosynthetic rate and intercellular CO2 concentration, thereby improving the pepper plant's resistance to pathogens. The combination of XJC2-1 with the fungicide dimethomorph (8 mu g mL(-1)) displayed strong synergism in inhibition of P. capsici infection, with a control efficiency as high as 75.16%, thus providing a basis for its application in the field. ConclusionOur study demonstrated that S. albus XJC2-1 inhibited Phytophthora pathogens from infecting pepper plants and enhanced plant host resistance. The combination of XJC2-1 and dimethomorph displayed a more stable and stronger control effect on pepper blight, showing potential for the future application of XJC2-1 in the field of biological control. (c) 2023 Society of Chemical Industry.