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Seasonal Variability and Pathogenicity of Kiwifruit Bacterial Canker Pathogens in Sichuan Province, China

文献类型： 外文期刊

作者： He, Chengyong 1 ; Xu, Zihong 1 ; Wang, Lingli 1 ; Li, Yarui 1 ; Li, Jing 1 ; Song, Haiyan 1 ; Chen, Dong 1 ; Jiang, Guoliang 1 ; Tu, Meiyan 1 ;

作者机构： 1.Sichuan Acad Agr Sci, Inst Hort, Chengdu 610066, Peoples R China

2.Minist Agr & Rural Affairs, Key Lab Hort Crop Biol & Germplasm Creat Southwest, Chengdu 610066, Peoples R China

关键词： kiwifruit; Psa; summer canker disease; Pca

期刊名称：PATHOGENS （ 影响因子：3.3； 五年影响因子：3.6 ）

ISSN：

年卷期： 2025 年 14 卷 2 期

页码：

收录情况： SCI

摘要： Kiwifruit canker disease, caused by different bacterial pathogens, was observed in Sichuan Province, China. Specifically, in the winter and spring seasons, Pseudomonas syringae pv. actinidiae (Psa) was identified as the primary pathogen, causing reddish-brown exudates, branch dieback, and phloem decay. In contrast, during the summer months, Pectobacterium carotovorum subsp. actinidiae (Pca) emerged as the primary causal agent of kiwifruit canker, exhibiting similar symptoms to those caused by Psa, such as exudates from leaf scars and lenticels, xylem necrosis, and branch desiccation. From 55 symptomatic samples, 34 bacterial isolates were obtained, with 28 identified as Psa and 6 as Pca. Pathogenicity tests revealed significant variation in virulence, with Psa isolate G5 and Pca isolate M5 showing the highest pathogenicity on leaves and branches, respectively. Both pathogens caused characteristic necrosis and lesion expansion, fulfilling Koch's postulates. Phylogenetic analyses confirmed the distinct evolutionary relationships of Psa and Pca isolates. These findings highlight the seasonal variability of kiwifruit canker pathogens and emphasize the need for targeted disease management strategies.

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