Auxin and abscisic acid antagonistically regulate ascorbic acid production via the SlMAPK8–SlARF4–SlMYB11 module in tomato

• DOI: 10.1093/plcell/koac262
• Publication Date: 2022-08-24T13:47:49Z
• Authors: Xin Xu; Qiongdan Zhang; Xueli Gao; Guanle Wu; Mengbo Wu; Yujin Yuan; Xianzhe Zheng; Zehao Gong; Xiaowei Hu; Min Gong; Tiancheng Qi; Honghai Li; Zisheng Luo; Zhengguo Li; Wei Deng
• Keywords: 2. Zero hunger; 0301 basic medicine; Indoleacetic Acids; Ascorbic Acid; 15. Life on land; 6. Clean water; Droughts; 03 medical and health sciences; Solanum lycopersicum; Gene Expression Regulation, Plant; Stress, Physiological; Abscisic Acid; Plant Proteins

Ascorbic acid (AsA) is a multifunctional phytonutrient that essential for the human diet as well plant development. While much known about AsA biosynthesis in plants, how this process regulated tomato (Solanum lycopersicum) fruits remains unclear. Here, we found auxin treatment inhibited accumulation leaves and pericarps of tomato. The response factor gene SlARF4 induced by to mediate auxin-induced inhibition accumulation. Specifically, transcriptionally inhibits transcription SlMYB11, thereby modulating regulating genes l-galactose-1-phosphate phosphatase, l-galactono-1,4-lactone dehydrogenase, dehydroascorbate. By contrast, abscisic (ABA) increased under drought stress. ABA expression mitogen-activated protein kinase SlMAPK8. We demonstrate SlMAPK8 phosphorylates its transcriptional activity, whereas SlMYB11 activates activity. functions ABA-induced stress tolerance. Moreover, antagonizes effects on biosynthesis. Therefore, auxin- regulation mediated SlMAPK8-SlARF4-SlMYB11 module during fruit development responses, shedding light roles phytohormones