茉莉酸
蜡
拟南芥
突变体
生物
拟南芥
植物对草食的防御
脂肪酸
新陈代谢
生物化学
脂质代谢
化学防御
植物
生物合成
细胞生物学
食草动物
基因
作者
Jiong Liu,Lu Li,Zhilong Xiong,Christelle Robert,Baozhu Li,Shan He,W Chen,Jiasheng Bi,Guanqing Zhai,Siyi Guo,Hui Zhang,Jieping Li,Shiying Zhou,Xi Zhang,Chun‐Peng Song
摘要
Plants have evolved complex physical and chemical defense systems that allow them to withstand herbivory infestation. Composed of a complex mixture of very-long-chain fatty acids (VLCFAs) and their derivatives, cuticular wax constitutes the first physical line of defense against herbivores. Here, we report the function of Glossy 8 (ZmGL8), which encodes a 3-ketoacyl reductase belonging to the fatty acid elongase complex, in orchestrating wax production and jasmonic acid (JA)-mediated defenses against herbivores in maize (Zea mays). The mutation of GL8 enhanced chemical defenses by activating the JA-dependent pathway. We observed a trade-off between wax accumulation and JA levels across maize glossy mutants and 24 globally collected maize inbred lines. In addition, we demonstrated that mutants defective in cuticular wax biosynthesis in Arabidopsis thaliana and maize exhibit enhanced chemical defenses. Comprehensive transcriptomic and lipidomic analyses indicated that the gl8 mutant confers chemical resistance to herbivores by remodeling VLCFA-related lipid metabolism and subsequent JA biosynthesis and signaling. These results suggest that VLCFA-related lipid metabolism has a critical role in regulating the trade-offs between cuticular wax and JA-mediated chemical defenses.
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