Abscisic Acid Regulates Auxin Distribution to Mediate Maize Lateral Root Development Under Salt Stress

Chongchong Lu; Mo-Xian Chen; Mo-Xian Chen; Mo-Xian Chen; Rui Liu; Lin Zhang; Xuanxuan Hou; Shouxu Liu; Xinhua Ding; Yong Jiang; Jiandi Xu; Jianhua Zhang; Jianhua Zhang; Xiangyu Zhao; Ying-Gao Liu

doi:10.3389/fpls.2019.00716

Frontiers in Plant Science (Jun 2019)

Abscisic Acid Regulates Auxin Distribution to Mediate Maize Lateral Root Development Under Salt Stress

Chongchong Lu,
Mo-Xian Chen,
Mo-Xian Chen,
Mo-Xian Chen,
Rui Liu,
Lin Zhang,
Xuanxuan Hou,
Shouxu Liu,
Xinhua Ding,
Yong Jiang,
Jiandi Xu,
Jianhua Zhang,
Jianhua Zhang,
Xiangyu Zhao,
Ying-Gao Liu

Affiliations

Chongchong Lu: State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
Mo-Xian Chen: State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
Mo-Xian Chen: Department of Biology, Hong Kong Baptist University, Shatin, Hong Kong
Mo-Xian Chen: State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, Hong Kong
Rui Liu: School of Life Sciences, Shandong University, Jinan, China
Lin Zhang: Department of Agronomy, Northeast Agricultural University, Harbin, China
Xuanxuan Hou: State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
Shouxu Liu: State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
Xinhua Ding: State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
Yong Jiang: National Oceanography Centre, Qingdao, China
Jiandi Xu: Rice Research Institute, Shandong Agricultural Research Institute, Jinan, China
Jianhua Zhang: Department of Biology, Hong Kong Baptist University, Shatin, Hong Kong
Jianhua Zhang: State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, Hong Kong
Xiangyu Zhao: State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China
Ying-Gao Liu: State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, China

DOI: https://doi.org/10.3389/fpls.2019.00716
Journal volume & issue: Vol. 10

Abstract

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Roots are important plant organs. Lateral root (LR) initiation (LRI) and development play a central role in environmental adaptation. The mechanism of LR development has been well investigated in Arabidopsis. When we evaluated the distribution of auxin and abscisic acid (ABA) in maize, we found that the mechanism differed from that in Arabidopsis. The distribution of ABA and auxin within the primary roots (PRs) and LRs was independent of each other. Auxin localization was observed below the quiescent center of the root tips, while ABA localized at the top of the quiescent center. Furthermore, NaCl inhibited LRI by increasing ABA accumulation, which mainly regulates auxin distribution, while auxin biosynthesis was inhibited by ABA in Arabidopsis. The polar localization of ZmPIN1 in maize was disrupted by NaCl and exogenous ABA. An inhibitor of ABA biosynthesis, fluridone (FLU), and the ABA biosynthesis mutant vp14 rescued the phenotype under NaCl treatment. Together, all the evidence suggested that NaCl promoted ABA accumulation in LRs and that ABA altered the polar localization of ZmPIN1, disrupted the distribution of auxin and inhibited LRI and development.

Published in Frontiers in Plant Science

ISSN: 1664-462X (Online)
Publisher: Frontiers Media S.A.
Country of publisher: Switzerland
LCC subjects: Agriculture: Plant culture
Website: https://www.frontiersin.org/journals/plant-science

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