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Developmentally regulated Arabidopsis thaliana susceptibility to tomato spotted wilt virus infection

文献类型： 外文期刊

作者： Huang, Ying 1 ; Hong, Hao 1 ; Xu, Min 1 ; Yan, Jiaoling 1 ; Dai, Jing 1 ; Wu, Jianyan 1 ; Feng, Zhike 1 ; Zhu, Min 1 ; Zhang 1 ;

作者机构： 1.Nanjing Agr Univ, Key Lab Plant Immun, Dept Plant Pathol, Nanjing 210095, Peoples R China

2.Yunnan Acad Agr Sci, Inst Biotechnol & Genet Resources, Yunnan Prov Key Lab Agri Biotechnol, Kunming, Yunnan, Peoples R China

3.Shandong Agr Univ, Shandong Prov Key Lab Agr Microbiol, Coll Plant Protect, Dept Plant Pathol, Tai An, Shandong, Peoples R China

关键词： Arabidopsis thaliana; developmentally regulated susceptibility; mature-dependent pathogen infection; Tomato spotted wilt virus

期刊名称：MOLECULAR PLANT PATHOLOGY （ 影响因子：5.663； 五年影响因子：5.626 ）

ISSN： 1464-6722

年卷期： 2020 年 21 卷 7 期

页码：

收录情况： SCI

摘要： Tomato spotted wilt virus (TSWV) is one of the most devastating plant viruses and often causes severe crop losses worldwide. Generally, mature plants become more resistant to pathogens, known as adult plant resistance. In this study, we demonstrated a new phenomenon involving developmentally regulated susceptibility of Arabidopsis thaliana to TSWV. We found that Arabidopsis plants become more susceptible to TSWV as plants mature. Most young 3-week-old Arabidopsis were not infected by TSWV. Infection of TSWV in 4-, 5-, and 6-week-old Arabidopsis increased from 9%, 21%, and 25%, respectively, to 100% in 7- to 8-week-old Arabidopsis plants. Different isolates of TSWV and different tospoviruses show a low rate of infection in young Arabidopsis but a high rate in mature plants. When Arabidopsis dcl2/3/4 or rdr1/2/6 mutant plants were inoculated with TSWV, similar results as observed for the wild-type Arabidopsis plants were obtained. A cell-to-cell movement assay showed that the intercellular movement efficiency of TSWV NSm:GFP fusion was significantly higher in 8-week-old Arabidopsis leaves compared with 4-week-old Arabidopsis leaves. Moreover, the expression levels of pectin methylesterase and beta-1,3-glucanase, which play critical roles in macromolecule cell-to-cell trafficking, were significantly up-regulated in 8-week-old Arabidopsis leaves compared with 4-week-old Arabidopsis leaves during TSWV infection. To date, this mature plant susceptibility to pathogen infections has rarely been investigated. Thus, the findings presented here should advance our knowledge on the developmentally regulated mature host susceptibility to plant virus infection.

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