WRR4B contributes to a broad‐spectrum disease resistance against powdery mildew in Arabidopsis

Author:

Mei Shuangshuang12,Song Yuxin12,Zhang Zuer12,Cui Haitao3,Hou Shuguo4ORCID,Miao Weiguo12ORCID,Rong Wei12ORCID

Affiliation:

1. College of Plant Protection Hainan University Haikou Hainan China

2. Key Laboratory of Green Prevention and Control of Tropical Plant Diseases and Pests Hainan University, Ministry of Education Haikou Hainan China

3. Shandong Provincial Key Laboratory of Agricultural Microbiology, College of Plant Protection Shandong Agricultural University Tai'an Shandong China

4. Institute of Advanced Agricultural Sciences Peking University Weifang Shandong China

Abstract

AbstractOidium heveae HN1106, a powdery mildew (PM) that infects rubber trees, has been found to trigger disease resistance in Arabidopsis thaliana through ENHANCED DISEASE SUSCEPTIBILITY 1 (EDS1)‐, PHYTOALEXIN DEFICIENT 4 (PAD4)‐ and salicylic acid (SA)‐mediated signalling pathways. In this study, a typical TOLL‐INTERLEUKIN 1 RECEPTOR, NUCLEOTIDE‐BINDING, LEUCINE‐RICH REPEAT (TIR‐NB‐LRR)‐encoding gene, WHITE RUST RESISTANCE 4 (WRR4B), was identified to be required for the resistance against O. heveae in Arabidopsis. The expression of WRR4B was upregulated by O. heveae inoculation, and WRR4B positively regulated the expression of genes involved in SA biosynthesis, such as EDS1, PAD4, ICS1 (ISOCHORISMATE SYNTHASE 1), SARD1 (SYSTEMIC‐ACQUIRED RESISTANCE DEFICIENT 1) and CBP60g (CALMODULIN‐BINDING PROTEIN 60 G). Furthermore, WRR4B triggered self‐amplification, suggesting that WRR4B mediated plant resistance through taking part in the SA‐based positive feedback loop. In addition, WRR4B induced an EDS1‐dependent hypersensitive response in Nicotiana benthamiana and contributed to disease resistance against three other PM species: Podosphaera xanthii, Erysiphe quercicola and Erysiphe neolycopersici, indicating that WRR4B is a broad‐spectrum disease resistance gene against PMs.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Plant Science,Soil Science,Agronomy and Crop Science,Molecular Biology

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