Affiliation:
1. Division of Life Sciences and Medicine, Ministry of Education Key Laboratory for Cellular Dynamics, School of Life Sciences, University of Science and Technology of China, Hefei 230027, China
Abstract
Root development is tightly controlled by light, and the response is thought to depend on signal transmission from the shoot. Here, we show that the root apical meristem perceives light independently from aboveground organs to activate the light-regulated transcription factor
ELONGATED HYPOCOTYL5
(
HY5
). The ROS balance between H
2
O
2
and superoxide anion in the root is disturbed under darkness with increased H
2
O
2
. We demonstrate that root-derived HY5 directly activates
PER6
expression to eliminate H
2
O
2
. Moreover, HY5 directly represses
UPBEAT1
, a known inhibitor of peroxidases, to release the expression of
PERs
, partially contributing to the light control of ROS balance in the root. Our results reveal an unexpected ability in roots with specific photoreception and provide a mechanistic framework for the HY5-mediated interaction between light and ROS signaling in early root development.
Funder
MOST | National Natural Science Foundation of China
the Strategic Priority Research Program of the Chinese Academy of Sciences
Publisher
Proceedings of the National Academy of Sciences
Cited by
5 articles.
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