Rust effector PNPi interacting with wheat TaPR1a attenuates plant defense response

Author:

Bi Weishuai,Zhao Shuqing,Zhao Jiaojie,Su Jun,Yu Xiumei,Liu Daqun,Kang Zhensheng,Wang Xiaojie,Wang XiaodongORCID

Abstract

Abstract NPR1 is a key regulator of systemic acquired resistance (SAR) in plant species. In our previous study, we identified a conserved fungal effector PNPi from Puccinia striiformis f. sp. tritici (Pst) that can suppress acquired resistance in local leaf by directly targeting the wheat NPR1 protein. In this investigation, we identified and validated a novel protein interaction between PNPi and wheat pathogenesis-related TaPR1a in the apoplastic space. TaPR1a-overexpressing wheat lines exhibited enhanced resistance to both Pst and Puccinia triticina (Pt). We further determined that exogenous expression of PNPi RNA in transgenic wheat lines reduced the degree of acquired resistance to Magnaporthe oryzae isolate P131 in the region adjacent to Pseudomonas syringae pv. tomato DC3000 infection area. Additionally, when PNPi was overexpressed, the expression levels of two plant defense responsive genes were suppressed upon P. syringae DC3000 infection in the local infiltration region. These findings established the mechanism of a single rust effector that can suppress multiple defense responses in wheat plants by targeting different components.

Funder

National Natural Science Foundation of China

Modern Agricultural Industry Technology System

Provincial Natural Science Foundation of Hebei for Excellent Young Scholar

Technology Innovation Team of Shaanxi Province

Open Project Program of State Key Laboratory of Crop Stress Biology for Arid Areas

Provincial Supporting Program of Hebei for the Returned Oversea Scholars

Mordern Agricultural Industry System Wheat Innovation Team in Hebei Province

Publisher

Springer Science and Business Media LLC

Subject

General Medicine

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