Photosynthetic characteristics, stress responses and plant growth of Eupatorium adenophorum in response to foliar application of different concentrations of glyphosate
2016
Jia-dong Chang | Jianli Huang | Yaseen, M. | Bo Jiang | Zonggen Shen | Defa Shi | Zhengdong Jiang | Zhechen Qi | Hongfei Lu | Zongsuo Liang
The effects of glyphosate on Eupatorium adenophorum, a worldwide noxious invasive weed, were investigated. Results showed that glyphosate had a progressive influence on photosynthethic characteristics and growth of E. adenophorum. However, variation in response was observed in plots treated with different concentrations (0%, 0.3%, 0.5%, 1.0% and 2.0%) of glyphosate. Firstly, chlorophyll flourescence and photosynthesis revealed that glyphosate significantly decreased the chlorophyll content, net photosynthetic rate (P sub N) effective quantum yield of photochemical energy conversion (Yield), the relative rate of electron transport through PSII (ETR), photochemical quenching (qP) and non-photochemical quenching (NPQ) at 2, 5 and 9 d after treatment, Superoxide dismutase (SOD) activity and proline content increased at first and then decreased with increase in concentration of glyphosate application, Secondly, application of glyphosate caused increase in shikimic acid content and a reverse trend in the synthesis of tryptophan. Results suggests that glyphosate should not be lower than 1.0% to kill rhizomes and suppress re-growth of E. adenophorum. Additional information on a hypothetical scheme explains the possible mechanisms of E. adenophorum coping with glyphosate stress.
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