A defensive pathway from NAC and TCP transcription factors activates a BAHD acyltransferase for (Z)‐3‐hexenyl acetate biosynthesis to resist herbivore in tea plant ( Camellia sinensis )

作者：Honglian Gu, Jia Li, Dahe Qiao, Mei Li, Yingjie Yao, Hui Xie, Kelin Huang, Shengrui Liu, De‐Yu Xie, Chaoling Wei, Junyan Zhu · 发表于：New Phytologist · 年份：2024 · DOI：10.1111/nph.20283 · 被引用次数：19 · 研究领域：Plant biochemistry and biosynthesis、Insect-Plant Interactions and Control、Insect and Pesticide Research

Numerous herbivore-induced plant volatiles (HIPVs) play important roles in plant defense. In tea plants (Camellia sinensis), (Z)-3-hexenyl acetate (3-HAC) has been characterized as associated with resistance to herbivores. To date, how tea plants biosynthesize and regulate 3-HAC to resist herbivores remain unclear. Based on transcriptomes assembled from Ectropis obliqua-fed leaves, a cDNA encoding BAHD acyltransferase, namely CsCHAT1, was highly induced in leaves fed with E. obliqua. Enzymatic assays showed that CsCHAT1 converted (Z)-3-hexenol into 3-HAC. Further suppression of CsCHAT1 expression reduced the accumulation of 3-HAC and lowered the resistance of tea plants to E. obliqua, while 3-HAC replenishment rescued the reduced resistance of CsCHAT1-silenced tea plants against E. obliqua. Two transcription factors (TFs), CsNAC30 and CsTCP11, were co-expressed with CsCHAT1. An integrative approach of biochemistry, DNA-protein interaction, gene silencing, and metabolic profiling revealed that the two TFs positively regulated the expression of CsCHAT1. The suppression of either one decreased the production of 3-HAC and eliminated the resistance of tea plants to E. obliqua. Notably, the suppression of either one considerably impaired JA-induced 3-HAC biosynthesis in tea plant. The proposed pathway can be targeted for innovative agro-biotechnologies protecting tea plants from damage by E. obliqua.