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Rice Os DOF 15 contributes to ethylene‐inhibited primary root elongation under salt stress
Author(s) -
Qin Hua,
Wang Juan,
Chen Xinbing,
Wang Fangfang,
Peng Peng,
Zhou Yun,
Miao Yuchen,
Zhang Yuqiong,
Gao Yadi,
Qi Yidong,
Zhou Jiahao,
Huang Rongfeng
Publication year - 2019
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.15824
Subject(s) - meristem , elongation , ethylene , microbiology and biotechnology , oryza sativa , biosynthesis , transcription factor , biology , chemistry , biochemistry , gene , materials science , ultimate tensile strength , metallurgy , catalysis
Summary In early seedlings, the primary root adapts rapidly to environmental changes through the modulation of endogenous hormone levels. The phytohormone ethylene inhibits primary root elongation, but the underlying molecular mechanism of how ethylene‐reduced root growth is modulated in environmental changes remains poorly understood. Here, we show that a novel rice ( Oryza sativa ) DOF transcription factor Os DOF 15 positively regulates primary root elongation by regulating cell proliferation in the root meristem, via restricting ethylene biosynthesis. Loss‐of‐function of Os DOF 15 impaired primary root elongation and cell proliferation in the root meristem, whereas Os DOF 15 overexpression enhanced these processes, indicating that Os DOF 15 is a key regulator of primary root elongation. This regulation involves the direct interaction of Os DOF 15 with the promoter of Os ACS 1 , resulting in the repression of ethylene biosynthesis. The control of ethylene biosynthesis by Os DOF 15 in turn regulates cell proliferation in the root meristem. Os DOF 15 transcription is repressed by salt stress, and Os DOF 15‐mediated ethylene biosynthesis plays a role in inhibition of primary root elongation by salt stress. Thus, our data reveal how the ethylene‐inhibited primary root elongation is finely controlled by Os DOF 15 in response to environmental signal, a novel mechanism of plants responding to salt stress and transmitting the information to ethylene biosynthesis to restrict root elongation.