The Auxin-Regulated Protein ZmAuxRPI Coordinates the Balance between Root Growth and Stalk Rot Disease Resistance in Maize  

作　　者：Jianrong Ye Tao Zhong Dongfeng Zhang Chuanyu Ma Lina Wang Lishan Yao Qianqian Zhang Mang Zhu Mingliang Xu 

机构地区：[1]State Key Laboratory of Plant Physiology and Biochemistry/National Maize Improvement Center/College of Agronomy and Biotechnology/Center for Crop Functional Genomics and Molecular Breeding,China Agricultural University,2 West Yuanmingyuan Road,Beijing 100193,P.R.China

出　　处：《Molecular Plant》2019年第3期360-373,共14页分子植物（英文版）

基　　金：the Ministry of Agriculture and Rural Affairs of the people's Republic of China (grant numbers 2018ZX0800917B) and the National Natural Science Foundation of China (31671704).

摘　　要：To optimize fitness, plants must efficiently allocate their resources between growth and defense. Although phytohormone crosstalk has emerged as a major player in balancing growth and defense, the genetic basis by which plants man age this balance remai ns elusive. We previously ide ntified a quantitative disease . resistance locus, qRfg2, in maize (Zea mays) that protects against the fungal disease Gibberella stalk rot. Here, through map-based cloning, we demonstrate that the causal gene at qRfg2 is ZmAuxRPI, which encodes a plastid stroma-localized auxin-regulated protein. ZmAuxRPI responded quickly to pathogen challenge with a rapid yet transient reduction in expression that led to arrested root growth but enhanced resista nee to Gibberella stalk rot and Fusarium ear rot. ZmAuxRPI was show n to promote the biosynthesis of indole-3-acetic acid (IAA), while suppressing the formation of benzoxazinoid defense compounds. ZmAuxRPI presumably acts as a resource regulator modulating indole-3-glycerol phosphate and/or indole flux at the branch point between the IAA and benzoxazinoid biosynthetic pathways. The concerted interplay between IAA and benzoxazinoids can regulate the growth-defense balance in a timely and efficient manner to optimize plant fitness.

关 键 词：MAIZE quantitative disease resistance GIBBERELLA STALK ROT Fusarium ear ROT indole-3-acetic acid benzoxazinoids 

分 类 号：Q[生物学]