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《浙江大学学报B辑(生物医学与生物技术)(英文版)》 2019-01
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Effects of ZJ0273 on barley and growth recovery of herbicide-stressed seedlings through application of branched-chain amino acids

Ling XU;Jian-yao SHOU;Rafaqat Ali GILL;Xiang GUO;Ullah NAJEEB;Wei-jun ZHOU;Zhejiang Key Lab of Plant Secondary Metabolism and Regulation and College of Life Sciences, Zhejiang Sci-Tech University;Zhuji Municipal Agro-Tech Extension Center;Institute of Crop Science and Zhejiang Key Lab of Crop Germplasm, Zhejiang University;Queensland Alliance for Agriculture and Food Innovation, Centre for Plant Science, the University of Queensland;  
In this study, we evaluated the effect of the herbicide propyl 4-(2-(4,6-dimethoxypyrimidin-2-yloxy)benzylamino) benzoate(ZJ0273) on barley growth and explored the potential to trigger growth recovery through the application of branched-chain amino acids(BCAAs). Barley plants were foliar-sprayed with various concentrations of ZJ0273(100, 500, or 1000 mg/L) at the four-leaf stage. Increasing either the herbicide concentration or measurement time after herbicide treatment significantly impaired plant morphological parameters such as plant height and biomass, and affected physiological indexes, i.e. maximal photochemical efficiency(Fv/Fm), quantum yield of photosystem II(ФPSII), net photosynthetic rate(Pn), and chlorophyll meter value(soil and plant analyzer development(SPAD)). Cellular injury of herbicide-treated plants was also evidenced by increased levels of reactive oxygen species(ROS) and antioxidative enzyme activity. Elevated levels of herbicide significantly reduced the activity of acetolactate synthase(ALS)—a keyD, enzyme in the biosynthesis of BCAAs. In a separate experiment, growth recovery in herbicide-stressed barley plants ? was studied using various concentrations of BCAAs(10, 50, 100, and 200 mg/L). Increasing BCAA concentration in growth media significantly increased the biomass of herbicide-stressed barley seedlings, but had no significant effect on non-stressed plants. Further, BCAAs(100 mg/L) significantly down-regulated ROS and consequently antioxidant enzyme levels in herbicide-stressed plants. Our results showed that exogenous application of BCAAs could reverse the inhibitory effects of ZJ0273 by restoring protein biosynthesis in barley seedlings.
【Fund】: Project supported by the Zhejiang Science and Technology Department(Nos.LGN18C130007 and 2016C02050-8);; the Jiangsu Collaborative Innovation Center for Modern Crop Production;; the Science Foundation of Zhejiang Sci-Tech University(No.14042216-Y) China
【CateGory Index】: S451.221
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