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Vitellogenin from planthopper oral secretion acts as a novel effector to impair plant defenses

文献类型： 外文期刊

作者： Ji, Rui 1 ; Fu, Jianmei 1 ; Shi, Yu 2 ; Li, Jing 1 ; Jing, Maofeng 2 ; Wang, Lu 1 ; Yang, Shiying 1 ; Tian, Tian 1 ; Wang, L 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Plant Protect, Jiangsu Key Lab Food & Safety, State Key Lab Cultivat Base,Minist Sci & Technol, Nanjing 210014, Peoples R China

2.Nanjing Agr Univ, Coll Plant Protect, Nanjing 210014, Peoples R China

3.Guangdong Key Lab New Technol Rice Breeding, Guangzhou 510640, Peoples R China

4.Univ Melbourne, Inst Bio21, Sch BioSci, Parkville, Vic 3010, Australia

5.Texas A&M Univ, Dept Entomol, College Stn, TX 77843 USA

关键词： effector; planthopper; plant-insect interaction; rice OsWRKY71; vitellogenin

期刊名称：NEW PHYTOLOGIST （ 影响因子：10.152； 五年影响因子：10.476 ）

ISSN： 0028-646X

年卷期： 2021 年 232 卷 2 期

页码：

收录情况： SCI

摘要： Vitellogenin (Vg) is a well-known nutritious protein involved in reproduction in nearly all oviparous animals, including insects. Recently, Vg has been detected in saliva proteomes of several piercing-sucking herbivorous arthropods, including the small brown planthopper (Laodelphax striatellus, SBPH). Its function, however, remains unexplored. We investigated the molecular mechanism underlying SBPH orally secreted Vg-mediated manipulation of plant-insect interaction by RNA interference, phytohormone and H2O2 profiling, protein-protein interaction studies and herbivore bioassays. A C-terminal polypeptide of Vg (VgC) in SBPH, when secreted into rice plants, acted as a novel effector to attenuate host rice defenses, which in turn improved insect feeding performance. Silencing Vg reduced insect feeding and survival on rice. Vg-silenced SBPH nymphs consistently elicited higher H2O2 production, a well-established defense mechanism in rice, whereas expression of VgC in planta significantly hindered hydrogen peroxide (H2O2) accumulation and promoted insect performance. VgC interacted directly with the rice transcription factor OsWRKY71, a protein which is involved in induction of H2O2 accumulation and plant resistance to SBPH. These findings indicate a novel effector function of Vg: when secreted into host rice plants, this protein effectively weakened H2O2-mediated plant defense through its association with a plant immunity regulator.

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