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Population Diversity of 'Candidatus Liberibacter asiaticus' and Diaphorina citri in Sichuan: A Case Study for Huanglongbing Monitoring and Interception

文献类型： 外文期刊

作者： Cui, Xuejin 1 ; Liu, Kehong 1 ; Huang, Jie 1 ; Fu, Shimin 1 ; Chen, Qingdong 2 ; Liu, Xu 2 ; Zhou, Changyong 1 ; Wang, Xuefeng 1 ;

作者机构： 1.Southwest Univ, Citrus Res Inst, Natl Citrus Engn Res Ctr, Chongqing 400712, Peoples R China

2.Sichuan Acad Agr Sci, Inst Plant Protect, Chengdu 610066, Sichuan, Peoples R China

关键词： disease management; pathogen diversity; prokaryotes

期刊名称：PLANT DISEASE （ 影响因子：4.614； 五年影响因子：5.33 ）

ISSN： 0191-2917

年卷期： 2022 年 106 卷 6 期

页码：

收录情况： SCI

摘要： Citrus huanglongbing (HLB) is present in 10 provinces in China and is associated with 'Candidatus Liberibacter asiaticus' (CLas), which is transmitted by the Asian citrus psyllid (Diaphorina citri, ACP). To date, HLB and ACP have expanded to Yibin city of Sichuan Province, posing an imminent threat to the citrus belt of the upper and middle reaches of the Yangtze River, an important late-maturing citrus-producing area in China. To understand the epidemiological route of CLas and ACP in newly invaded regions of Sichuan and thereby better establish an HLB interception zone ranging from Leibo to Yibin, we evaluated the molecular variability of 19 CLas draft genomes from citrus or dodder (Cuscuta campestris). They include three type-specific prophage loci, three variable number tandem repeat loci, a miniature inverted-repeat transposable element, and population diversity of 44 ACP mitochondrial genomes. The results indicated that CLas isolates in the newly invaded area (Pingshan) were more diverse than those in the HLB endemic areas (Leibo and Ningnan). Phylogenetic analysis based on mitochondrial genomes demonstrated that ACPs in Leibo, Pingshan, and Xuzhou (rural areas) represent a new mitochondrial group (MG4), distinguished by the three unique single-nucleotide polymorphisms in cox1, nad4, and cytb. However, the ACPs sampled from the urban areas of Cuiping and Xuzhou belonged to the southeastern China group (MG2-1). Altogether, our study revealed multiple sources of ACP and CLas in the HLB interception zone and proposed their transmission route. This study contributes to the formulation of precise HLB prevention and control strategies in the HLB interception zone in Sichuan and could be useful for HLB management efforts in other regions.

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