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. 2024 Feb 9;383(6683):659-666.
doi: 10.1126/science.adl2953. Epub 2024 Feb 8.

Molecular regulation of oil gland development and biosynthesis of essential oils in Citrus spp

Hongxing Wang #  1 , Jie Ren #  1 , Shiyun Zhou  1 , Yaoyuan Duan  1 , Chenqiao Zhu  1 , Chuanwu Chen  2 , Ziyan Liu  1 , Qingyou Zheng  1   3 , Shu Xiang  1 , Zongzhou Xie  1 , Xia Wang  1   3 , Lijun Chai  1   3 , Junli Ye  1 , Qiang Xu  1   3 , Wenwu Guo  1   3 , Xiuxin Deng  1   3 , Fei Zhang  1   3
Affiliations

Molecular regulation of oil gland development and biosynthesis of essential oils in Citrus spp

Hongxing Wang et al. Science. .

Abstract

Secretory structures in terrestrial plants serve as reservoirs for a variety of secondary metabolites. Among these, the secretory cavity of the Rutaceae family is notable for containing essential oils with a wide range of applications. However, the molecular basis underlying secretory cavity development is unknown. Here, we reveal a molecular framework for Citrus oil gland formation. Using genetic mapping and genome editing, we demonstrated that this process requires LATE MERISTEM IDENTITY1 (LMI1), a key regulator of leaf serration. A conserved GCC box element of the LMI1 promoter recruits DORNROSCHEN-like (DRNL) for transcriptional activation. This DRNL-LMI1 cascade triggers MYC5 activation, facilitating the development of oil glands and the biosynthesis of essential oils. Our findings spotlight cis-regulatory divergence within leaf shape genes, propelling novel functional tissue formation.

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