数字农科院2.0

Identification and application of a candidate gene AhAftr1 for aflatoxin production resistance in peanut seed ( Arachis hypogaea L.)

文献类型： 外文期刊

作者： Yu, Bolun;Liu, Nian;Huang, Li;Luo, Huaiyong;Zhou, Xiaojing;Lei, Yong;Yan, Liying;Wang, Xin;Chen, Weigang;Kang, Yanping;Ding, Yingbin;Jin, Gaorui;Pandey, Manish K.;Janila, Pasupuleti;Sudini, Hari Kishan;Varshney, Rajeev K.;Jiang, Huifang;Liu, Shengyi;Liao, Boshou

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关键词： Peanut;Aflatoxin production resistance;NB-LRRs;ETI;Diagnositic marker

期刊名称： JOURNAL OF ADVANCED RESEARCH

ISSN： 2090-1232

年卷期： 2024 年 62 卷

页码：

收录情况： SCIE（2024版）

摘要： Introduction: Peanut is susceptible to infection of Aspergillus fungi and conducive to aflatoxin contamination, hence developing aflatoxin-resistant variety is highly meaningful. Identifying functional genes or loci conferring aflatoxin resistance and molecular diagnostic marker are crucial for peanut breeding. Objectives: This work aims to (1) identify candidate gene for aflatoxin production resistance, (2) reveal the related resistance mechanism, and (3) develop diagnostic marker for resistance breeding program. Methods: Resistance to aflatoxin production in a recombined inbred line (RIL) population derived from a high-yielding variety Xuhua13 crossed with an aflatoxin-resistant genotype Zhonghua 6 was evaluated under artificial inoculation for three consecutive years. Both genetic linkage analysis and QTL-seq were conducted for QTL mapping. The candidate gene was further fine-mapped using a secondary segregation mapping population and validated by transgenic experiments. RNA-Seq analysis among resistant and susceptible RILs was used to reveal the resistance pathway for the candidate genes. Results: The major effect QTL qAFTRA07.1 for aflatoxin production resistance was mapped to a 1.98 Mbp interval. A gene, AhAftr1 ( Arachis hypogaea Aflatoxin resistance 1), was detected structure variation (SV) in leucine rich repeat (LRR) domain of its production, and involved in disease resistance response through the effector-triggered immunity (ETI) pathway. Transgenic plants with overexpression of AhAftr1(ZH6) (ZH6) exhibited 57.3% aflatoxin reduction compared to that of AhAftr1(XH13). (XH13) . A molecular diagnostic marker AFTR.Del.A07 was developed based on the SV. Thirty-six lines, with aflatoxin content decrease by over 77.67% compared to the susceptible control Zhonghua12 (ZH12), were identified from a panel of peanut germplasm accessions and breeding lines through using AFTR.Del.A07. Conclusion: Our findings would provide insights of aflatoxin production resistance mechanisms and laid meaningful foundation for further breeding programs. (c) 2024 The Authors. Published by Elsevier B.V. on behalf of Cairo University. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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