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Synergistic action of auxin and cytokinin mediates aluminum‐induced root growth inhibition in Arabidopsis
Author(s) -
Yang ZhongBao,
Liu Guangchao,
Liu Jiajia,
Zhang Bing,
Meng Wenjing,
Müller Bruno,
Hayashi Kenichiro,
Zhang Xiansheng,
Zhao Zhong,
De Smet Ive,
Ding Zhaojun
Publication year - 2017
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.15252/embr.201643806
Subject(s) - cytokinin , auxin , meristem , arabidopsis , microbiology and biotechnology , biology , lateral root , plant hormone , botany , shoot , biochemistry , mutant , gene
Abstract Auxin acts synergistically with cytokinin to control the shoot stem‐cell niche, while both hormones act antagonistically to maintain the root meristem. In aluminum (Al) stress‐induced root growth inhibition, auxin plays an important role. However, the role of cytokinin in this process is not well understood. In this study, we show that cytokinin enhances root growth inhibition under stress by mediating Al‐induced auxin signaling. Al stress triggers a local cytokinin response in the root‐apex transition zone ( TZ ) that depends on IPT s, which encode adenosine phosphate isopentenyltransferases and regulate cytokinin biosynthesis. IPT s are up‐regulated specifically in the root‐apex TZ in response to Al stress and promote local cytokinin biosynthesis and inhibition of root growth. The process of root growth inhibition is also controlled by ethylene signaling which acts upstream of auxin. In summary, different from the situation in the root meristem, auxin acts with cytokinin in a synergistic way to mediate aluminum‐induced root growth inhibition in Arabidopsis .