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Cytochrome P450 CYP90D5 Enhances Degradation of the Herbicides Isoproturon and Acetochlor in Rice Plants and Grains
Xiang Ning Su1, Xue Song Liu2, Chuan Ying Li1
1Research Institute of Plant Protection, Guangdong Academy of Agricultural Sciences & Key Laboratory of Green Prevention and Control of Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs & Key Laboratory of High Technology for Plant Protection of Guangdong Province, Guangzhou 510640, China.
Abstract:
The rice cytochrome P450 gene has been comprehensively studied in the present study. This gene encodes CYP90D5 in promoting the degradation of isoproturon (IPU) and acetochlor (ACT) in rice tissues and grains. It has here been found that CYP90D5 improved the resistance of the plant to IPU and ACT, which was reflected in the improvement of the growth of the overexpression (OE) lines. CYP90D5 also reduced the levels of IPU and ACT accumulation in rice, and the CRISPR-Cas9 (Cas9) lines displayed the opposite effects. This function of CYP90D5 for pesticide degradation was also confirmed by the transformation of CYP90D5 in Pichia pastoris. Compared with the control yeast, it grew better and could degrade more pesticides. In addition, the relative contents of the IPU and ACT derivatives increased in the OE rice, while they decreased in the Cas9 rice. This suggested that CYP90D5 plays a pivotal role in the pesticide detoxification and degradation.
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