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Article|20 Jan 2022|OPEN
H and HL synergistically regulate jasmonate-triggered trichome formation in tomato
Bing Hua1,2 ,† , Jiang Chang1 ,† , Xiaoqian Han1 ,† , Zhijing Xu1 , Shourong Hu1 , Shuang Li1 , Renyin Wang1 , Liling Yang1 , Meina Yang1 , Shasha Wu1 , Jingyuan Shen1 and Xiaomin Yu1 , Shuang Wu,1 ,
1College of Horticulture, FAFU-UCR Joint Center for Horticultural Biology and Metabolomics, Fujian Agriculture and Forestry University, Fuzhou 350002, China
2College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China
*Corresponding author. E-mail: wus@fafu.edu.cn
Bing Hua and Jiang Chang,Xiaoqian Han contributed equally to the study.

Horticulture Research 9,
Article number: uhab080 (2022)
doi: https://doi.org/10.1093/hr/uhab080
Views: 28

Received: 06 Sep 2021
Accepted: 25 Nov 2021
Published online: 20 Jan 2022

Abstract

The development of trichomes, which protect plants against herbivores, is affected by various stresses. In tomato, previous studies showed that stress-triggered jasmonic acid (JA) signaling influences trichome formation, but the underlying mechanism is not fully resolved. Here, we found that two C2H2 zinc finger proteins synergistically regulate JA-induced trichome formation in tomato. The naturally occurring mutations in the H gene and its close homolog H-like in a spontaneous mutant, LA3172, cause severely affected trichome development. Compared with the respective single mutant, the h/hl double mutant displayed more severe trichome defects in all tissues. Despite their partially redundant function, the H and HL genes regulate trichome formation in a spatially distinct manner, with HL more involved in hypocotyls and leaves while H is more involved in stems and sepals. Furthermore, the activity of H/HL is essential for JA-triggered trichome formation. The JA signaling inhibitor SlJAZ2 represses the activity of H and HL via physical interaction, resulting in the activation of THM1, a negative regulator of trichome formation. Our results provide novel insight into the mechanism of trichome formation in response to stress-induced JA signaling in tomato.