Characterization of a Topramezone-Resistant Rice Mutant TZR1: Insights into GST-Mediated Detoxification and Antioxidant Responses
文献类型： 外文期刊
第一作者： Hu, Shiyuan
作者： Hu, Shiyuan;Luo, Kai;Pan, Lang;Li, Sifu;Tang, Tao;Ma, Guolan;Peng, Yajun;Li, Sifu;Zhang, Yuzhu;Liu, Yang
作者机构：
关键词：
radiation mutagenesis; topramezone; HPPD; glutathione
期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）
ISSN： 2223-7747
年卷期： 2025 年 14 卷 3 期
页码：
收录情况： SCI
摘要： Mutagenesis breeding, combined with the application of corresponding herbicides to develop herbicide-resistant rice germplasm, provides great promise for the management of weeds and weedy rice. In this study, a topramezone-resistant rice mutant, TZR1, was developed from the indica rice line Chuangyu 9H (CY9H) through radiation mutagenesis and topramezone selection. Dose-response curves revealed that the resistance index of TZR1 to topramezone was 1.94-fold compared to that of CY9H. The resistance mechanism of TZR1 was not due to target-site resistance. This resistance could be reversed by a specific inhibitor of glutathione S-transferase (GST). The activity of antioxidant enzymes was analyzed. SNPs and Indels were detected using whole-genome resequencing; differentially expressed genes were identified through RNA sequencing. Then, they underwent Gene Ontology and Kyoto Encyclopedia of Genes and Genomes enrichment analyses. Key candidate genes associated with topramezone resistance were validated via a real-time quantitative PCR assay. Five GST genes, two UDP-glycosyltransferase genes, and three ATP-binding cassette transporter genes were identified as potential contributors to topramezone detoxification in TZR1. Overall, these findings suggest that GST enzymes possibly play an important role in TZR1 resistance to topramezone. This study will provide valuable information for the scientific application of 4-hydroxyphenylpyruvate dioxygenase inhibitors in paddy fields in future.
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