Limited infection by 'Candidatus Liberibacter asiaticus' in 'Valencia' sweet orange trees in the presence of Citrus tristeza virus

文献类型： 外文期刊

第一作者： Fu Shi-min

作者： Fu Shi-min;Zhou Chang-yong;Hartung, John S.;Gouin, Cristina

作者机构： Southwest Univ, Natl Citrus Engn Res Ctr, Citrus Res Inst, Chinese Acad Agr Sci, Chongqing 400712, Peoples R China;USDA ARS, Mol Plant Pathol Lab, Beltsville, MD 20705 USA;Anim & Plant Hlth Inspect Serv, Biotechnol & Regulatory Serv, USDA, Riverdale, MD 20705 USA

关键词： huanglongbing; plant defense; plant protection

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 2020影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2019 年 18 卷 10 期

页码：

收录情况： SCI

摘要： Huanglongbing (HLB) is the most destructive disease of citrus and is associated with 'Candidatus Liberibacter asiaticus' (CLas), a member of the alpha-proteobacteria. Citrus tristeza virus (CTV) is another pathogen of citrus with very great historic as well as current importance. Both CLas and CTV are phloem-restricted pathogens. A severe CTV isolate, CTV-B6, and CLas-B232 induce a group of symptoms of phloem dysfunction that overlap, but the mild isolate CTV-B2 does not cause any loss to commercial trees. Prior inoculation and establishment of CLas-B232 did not affect subsequent establishment of either CTV-B2 or CTV-B6, while super infection by CLas-B232 was reduced by prior establishment of CTV-B2 and to a lesser extent by prior infection with CTV-B6. Trees co-infected with CTV-B6 and CLas-B232 developed more severe symptoms, typical of CTV-B6, than either of the two pathogens co-infected with CTV-B2. In this study, we confirmed that CLas established in the rootlets earlier and with higher concentration than in leaves. The distribution of CLas in the plant infected by CLas-B438 alone and with CTV-B2 fits a previously proposed model but CLas was more sporadically distributed in a plant co-infected by CLas and CTV-B2 than in a plant infected by CLas alone. These biological phenomena are aligned with previously analyzed transcriptome data and the study provides a novel idea that mild CTV strains may provide some protection against CLas by limiting its multiplication and spread. The protective effect may be due to opposite regulation of key host defense pathways in response to CTV-B2 and CLas-B438.

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