The land plant‐specific MIXTA‐MYB lineage is implicated in the early evolution of the plant cuticle and the colonization of land

第一作者：Bo Xu

第一单位：中科院植物所

通讯作者：Samuel F. Brockington

 Abstract 

背景回顾：The evolution of a lipid‐based cuticle on aerial plant surfaces that protects against dehydration is considered a fundamental innovation in the colonization of the land by the green plants.

提出问题：However, key evolutionary steps in the early regulation of cuticle synthesis are still poorly understood, owing to limited studies in early‐diverging land plant lineages.

主要发现：Here, we characterize a land plant specific subgroup 9 R2R3 MYB transcription factor MpSBG9, in the early‐diverging land plant model Marchantia polymorpha, that is homologous to MIXTA proteins in vascular plants.

结果1-SBG9特异功能：The MpSBG9 functions as a key regulator of cuticle biosynthesis by preferentially regulating expression of orthologous genes for cutin formation, but not wax biosynthesis genes.

结果2-SBG9经典功能：The MpSBG9 also promotes the formation of papillate cells on the adaxial surface of M. polymorpha, which is consisitent with its canonical role in vascular plants.

结论：Our observations imply conserved MYB transcriptional regulation in the control of the cutin biosynthesis pathway as a core genetic network in the common ancestor of all land plants, implicating the land plant‐specific MIXTA MYB lineage in the early origin and evolution of the cuticle.

 通讯作者 

doi: 10.1111/nph.16997

Journal: New Phytologist

Published online: Nov 08, 2020