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A recessive LRR-RLK gene causes hybrid breakdown in cotton

文献类型： 外文期刊

作者： Xu, Peng 1 ; Xu, Jianwen 1 ; Guo, Qi 1 ; Xu, Zhenzhen 1 ; Ji, Wei 1 ; Yu, Huan 1 ; Cai, Jihong 1 ; Zhao, Liang 1 ; Zhao, Jun 1 ; Liu, Jianguang 1 ; Chen, Xianglong 1 ; Shen, Xinlian 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Ind Crops, Key Lab Cotton & Rapeseed Nanjing, Minist Agr & Rural Affairs, Nanjing 210014, Peoples R China

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.4； 五年影响因子：5.7 ）

ISSN： 0040-5752

年卷期： 2023 年 136 卷 9 期

页码：

收录情况： SCI

摘要： Key messageAn LRR-RLK gene causing interspecific hybrid breakdown between Gossypium. anomalum and G. hirsutum was identified by deploying a map-based cloning strategy.The self-destructing symptoms of hybrid incompatibility in most cases are attributed to autoimmunity. The cloning of genes responsible for hybrid incompatibility in cotton is helpful to clarify the mechanisms underlying hybrid incompatibility and can break the barriers in distant hybridization. In this study, a temperature-dependent lethality was identified in CSSL11-9 (chromosome segment substitution line) with Gossypium anomalum chromosome segment on chromosome A11. Transcriptome analysis showed the differentially expressed genes related to autoimmune responses were highly enriched, suggesting that expression of CSSL11-9 plant lethal gene activated autoimmunity in the absence of any pathogen or external stimulus, inducing programmed cell death (PCD) and causing a lethal phenotype. The lethal phenotype was controlled by a pair of recessive genes and then fine mapped between JAAS3191-JAAS3050 interval, which covered 63.87 kb in G. hirsutum genome and 98.66 kb in G. anomalum. We demonstrated that an LRR-RLK gene designated as hybrid breakdown 1 (GoanoHBD1) was the causal gene underlying this locus for interspecific hybrid incompatibility between G. anomalum and G. hirsutum. Silencing this LRR-RLK gene could restore CSSL11-9 plants from a lethal to a normal phenotype. Our findings provide new insights into reproductive isolation and may benefit cotton breeding.

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