Feng-Yan Zhou , Huan Lu , Xueping Huang , Yunjing Han , Yong Zhang , Heping Han , Liudmyla Tsykalchuk , Alex Nyporko , Qin Yu
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引用次数: 0
Abstract
In our previous study with a wild radish (Raphanus raphanistrum) population resistant to HPPD-inhibiting herbicides we indicated that two additional candidate P450 genes, CYP71A28 and CYP72A13-like, may also contribute to the resistance. This study investigates the role of these two P450 genes in mesotrione resistance in the wild radish population. The full-length R. raphanistrum P450 genes (thereafter named as RrCYP71A28 and RrCYP72A15) were cloned from mesotrione-resistant (R) and -susceptible (S) wild radish plants. RT-qPCR results showed that basal expression levels of the two P450 genes are significantly higher (up to 3-fold) in the R than the S plants. Escherichia coli cells transformed respectively with RrCYP71A28 and RrCYP72A15 were more tolerant to mesotrione. Transgenic Arabidopsis plants expressing RrCYP72A15 showed a modest level of resistance to mesotrione. UPLC-MS/MS analysis demonstrated that tissue mesotrione levels in RrCYP72A15 transgenic Arabidopsis plants were significantly lower (up to 2-fold) than that in the wild type. Structural modelling predicts CYP72A15 can bind to RrCYP72A15 and metabolize mesotrione likely through formation of 4-OH-mesotrione. Although the RrCYP72A15 gene confers a modest level of resistance, overexpression of the multiple herbicide-metabolizing genes could contribute to the low level of mesotrione resistance observed in the R wild radish population.
期刊介绍:
Pesticide Biochemistry and Physiology publishes original scientific articles pertaining to the mode of action of plant protection agents such as insecticides, fungicides, herbicides, and similar compounds, including nonlethal pest control agents, biosynthesis of pheromones, hormones, and plant resistance agents. Manuscripts may include a biochemical, physiological, or molecular study for an understanding of comparative toxicology or selective toxicity of both target and nontarget organisms. Particular interest will be given to studies on the molecular biology of pest control, toxicology, and pesticide resistance.
Research Areas Emphasized Include the Biochemistry and Physiology of:
• Comparative toxicity
• Mode of action
• Pathophysiology
• Plant growth regulators
• Resistance
• Other effects of pesticides on both parasites and hosts.