Imazethapyr Enantioselectively Affects Chlorophyll Synthesis and Photosynthesis in Arabidopsis thaliana
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- 作者：Haifeng Qian ; Xiao Han ; Qiannan Zhang ; Zhengqi Sun ; Liwei Sun ; Zhengwei Fu
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2013
- 出版时间：February 13, 2013
- 年：2013
- 卷：61
- 期：6
- 页码：1172-1178
- 全文大小：296K
- 年卷期：v.61,no.6(February 13, 2013)
- ISSN：1520-5118
文摘
Imazethapyr (IM) is a chiral herbicide with reported enantioselective biological activities between its enantiomers. This report investigated the effect of enantioselectivity between R- and S-IM in Arabidopsis thaliana on chlorophyll synthesis and photosynthesis. The results suggest that R-IM inhibited the transcription of chlM to a greater extent than S-IM, which reduced chlorophyll synthesis. R-IM also showed a stronger inhibitory effect than S-IM on the transcription of photosynthesis-related genes, affecting linear electron transport and CO2 fixation. IM stress enantioselectively induced transcriptional upregulation of the ndhH gene, a representative of the NDH complex. In contrast, the expression of pgr5 was downregulated, which demonstrated that IM stress enhanced adenosine 5鈥?triphosphate (ATP) synthesis by stimulating an NDH-dependent and not ferredoxin (FD)-independent route. This study suggested that R-IM has a greater toxic effect on photosynthesis than S-IM, affecting plant growth through chlorophyll synthesis.