拟南芥
转录因子
词根(语言学)
生物
细胞生物学
战斗或逃跑反应
化学
基因
遗传学
突变体
语言学
哲学
作者
Lulu Zheng,Yongfeng Hu,Ting Yang,Zhen Wang,Daoyuan Wang,Letian Jia,Yuanming Xie,Lin Luo,Weicong Qi,Yuanda Lv,Tom Beeckman,Wei Xuan,Yi Han
标识
DOI:10.1038/s41467-024-46482-7
摘要
Abstract Plants are capable of altering root growth direction to curtail exposure to a saline environment (termed halotropism). The root cap that surrounds root tip meristematic stem cells plays crucial roles in perceiving and responding to environmental stimuli. However, how the root cap mediates root halotropism remains undetermined. Here, we identified a root cap-localized NAC transcription factor, SOMBRERO (SMB), that is required for root halotropism. Its effect on root halotropism is attributable to the establishment of asymmetric auxin distribution in the lateral root cap (LRC) rather than to the alteration of cellular sodium equilibrium or amyloplast statoliths. Furthermore, SMB is essential for basal expression of the auxin influx carrier gene AUX1 in LRC and for auxin redistribution in a spatiotemporally-regulated manner, thereby leading to directional bending of roots away from higher salinity. Our findings uncover an SMB-AUX1-auxin module linking the role of the root cap to the activation of root halotropism.
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