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Journal of Zhejiang University SCIENCE B 1998 Vol.-1 No.-1 P.

10.1631/jzus.B1700375


Effects of ZJ0273 on barley and growth recovery of herbicide-stressed seedlings through application of branched-chain amino acids


Author(s):  Ling XU, Jian-yao SHOU, Rafaqat Ali GILL, Xiang GUO, Ullah NAJEEB, Wei-jun ZHOU

Affiliation(s):  Zhejiang Key Lab of Plant Secondary Metabolism and Regulation and College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou 310018, China; more

Corresponding email(s):   n.ullah@uq.edu.au, wjzhou@zju.edu.cn

Key Words:  Antioxidant enzyme activities, Barley, Branched-chain amino acids, Photosynthetic system, Reactive oxygen species, ZJ0273


Ling XU, Jian-yao SHOU, Rafaqat Ali GILL, Xiang GUO, Ullah NAJEEB, Wei-jun ZHOU. Effects of ZJ0273 on barley and growth recovery of herbicide-stressed seedlings through application of branched-chain amino acids[J]. Journal of Zhejiang University Science B, 1998, -1(10): .

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author="Ling XU, Jian-yao SHOU, Rafaqat Ali GILL, Xiang GUO, Ullah NAJEEB, Wei-jun ZHOU",
journal="Journal of Zhejiang University Science B",
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publisher="Zhejiang University Press & Springer",
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%T Effects of ZJ0273 on barley and growth recovery of herbicide-stressed seedlings through application of branched-chain amino acids
%A Ling XU
%A Jian-yao SHOU
%A Rafaqat Ali GILL
%A Xiang GUO
%A Ullah NAJEEB
%A Wei-jun ZHOU
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T1 - Effects of ZJ0273 on barley and growth recovery of herbicide-stressed seedlings through application of branched-chain amino acids
A1 - Ling XU
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A1 - Rafaqat Ali GILL
A1 - Xiang GUO
A1 - Ullah NAJEEB
A1 - Wei-jun ZHOU
J0 - Journal of Zhejiang University Science B
VL - -1
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PB - Zhejiang University Press & Springer
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Abstract: 
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 PSII (ФPSII), net photosynthetic rate (Pn) and chlorophyll meter value (SPAD). Cellular injury of herbicide-treated plants was also evidenced by increased levels of reactive oxygen species (ROS) and antioxidative enzyme activities. Elevated levels of herbicide significantly reduced the activity of acetolactate synthase (ALS) – a key enzyme in the biosynthesis of BCAAs. In a separate experiment, growth recovery in herbicide-stressed barley plants was studied using various concentrations (10, 50, 100 and 200 mg/L) of BCAAs. Increasing BCAAs concentration in growth media signifcantly 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.

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