数字农科院2.0

Potential Role of EPSPS Mutations in the Resistance of Eleusine indica to Glyphosate

文献类型： 外文期刊

作者： Jingchao Chen;Hailan Cui;Zhiling Li;Haiyan Yu;Qiang Hou;Xiangju Li

作者机构：

关键词： affinity;Eleusine indica;fitness;glyphosate;metabolomics;mutation

期刊名称： International Journal of Molecular Sciences

ISSN： 1661-6596

年卷期： 2023 年 24 卷 9 期

页码：

收录情况： SCIE（2023版）

摘要： Gene mutation is a basic evolutionary mechanism in plants under selection pressure of herbicides. Such mutation has pleiotropic effects on plant growth. We systemically investigated the effects of Pro106Leu (P106L), Pro106Ser (P106S), and Thr102Ile + Pro106Ser (TIPS) mutations on EPSPS functionality and fitness traits in Eleusine indica at the biochemical and physiological levels. The affinity of natural EPSPS for glyphosate was 53.8 times higher than that for phosphoenolpyruvate (PEP), as revealed by the dissociation constant; the constant decreased in both the P106L (39.9-fold) and P106S (46.9-fold) mutants but increased in the TIPS (87.5-fold) mutant. The Km (PEP) values of the P106L, P106S, and TIPS mutants were 2.4-, 0.7-, and 4.1-fold higher than that of natural EPSPS, corresponding to resistance levels of 2.5, 1.9, and 11.4, respectively. The catalytic efficiency values (maximum reaction rates) were 0.89-, 0.94-, and 0.26-fold higher than that of natural EPSPS. The levels of metabolites related to amino acids and nucleotides were significantly reduced in the mutated plants. The fitness costs were substantial for the biomass, total leaf area, seed number, and seedling emergence throughout the growth period in the plants with P106L and TIPS mutations. These results provide insights into EPSPS kinetics and their effect on plant growth.

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