Inheritance and Molecular Characterization of a Novel Mutated AHAS Gene Responsible for the Resistance of AHAS-Inhibiting Herbicides in Rapeseed (Brassica napus L.)

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ID: 112982
2020
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Abstract
The use of herbicides is an effective and economic way to control weeds, but their availability for rapeseed is limited due to the shortage of herbicide-resistant cultivars in China. The single-point mutation in the acetohydroxyacid synthase (AHAS) gene can lead to AHAS-inhibiting herbicide resistance. In this study, the inheritance and molecular characterization of the tribenuron-methyl (TBM)-resistant rapeseed (Brassica napus L.) mutant, K5, are performed. Results indicated that TBM-resistance of K5 was controlled by one dominant allele at a single nuclear gene locus. The novel substitution of cytosine with thymine at position 544 in BnAHAS1 was identified in K5, leading to the alteration of proline with serine at position 182 in BnAHAS1. The TBM-resistance of K5 was approximately 100 times that of its wild-type ZS9, and K5 also showed cross-resistance to bensufuron-methyl and monosulfuron-ester sodium. The BnAHAS1544T transgenic Arabidopsis exhibited higher TBM-resistance than that of its wild-type, which confirmed that BnAHAS1544T was responsible for the herbicide resistance of K5. Simultaneously, an allele-specific marker was developed to quickly distinguish the heterozygous and homozygous mutated alleles BnAHAS1544T. In addition, a method for the fast screening of TBM-resistant plants at the cotyledon stage was developed. Our research identified and molecularly characterized one novel mutative AHAS allele in B. napus and laid a foundation for developing herbicide-resistant rapeseed cultivars.
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huang2020internationalinheritance Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Qianxin Huang;Jinyang Lv;Yanyan Sun;Hongmei Wang;Yuan Guo;Gaoping Qu;Shengwu Hu;Huang, Qianxin;Lv, Jinyang;Sun, Yanyan;Wang, Hongmei;Guo, Yuan;Qu, Gaoping;Hu, Shengwu;
Journal International journal of molecular sciences
Year 2020
DOI
10.3390/ijms21041345
URL
https://www.mdpi.com/1422-0067/21/4/1345/htm
Keywords
rapeseed (brassica napus l.) acetohydroxyacid synthase single-point mutation herbicide resistance rapeseed (brassica napus l.) acetohydroxyacid synthase single-point mutation herbicide resistance

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