NDLI: Hydrogen Peroxide-Mediated Growth of the Root System Occurs via Auxin Signaling Modification and Variations in the Expression of Cell-Cycle Genes in Rice Seedlings Exposed to Cadmium Stress

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Hydrogen Peroxide-Mediated Growth of the Root System Occurs via Auxin Signaling Modification and Variations in the Expression of Cell-Cycle Genes in Rice Seedlings Exposed to Cadmium Stress

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Hydrogen Peroxide-Mediated Growth of the Root System Occurs via Auxin Signaling Modification and Variations in the Expression of Cell-Cycle Genes in Rice Seedlings Exposed to Cadmium Stress

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Zhao, Feng-Yun Han, Ming-Ming Zhang, Shi-Yong Wang, Kai Zhang, Cheng-Ren Liu, Tao Liu, Wen
Description	Country affiliation: China Author Affiliation: Zhao FY ( College of Life Sciences, Shandong University of Technology, Zibo 255049, China. zhaofengyun@sdut.edu.cn)
Abstract	The link between root growth, $H_{2}O_{2},$ auxin signaling, and the cell cycle in cadmium (Cd)-stressed rice (Oryza sativa L. cv. Zhonghua No. 11) was analyzed in this study. Exposure to Cd induced a significant accumulation of Cd, but caused a decrease in zinc (Zn) content which resulted from the decreased expression of OsHMA9 and OsZIP. Analysis using a Cd-specific probe showed that Cd was mainly localized in the meristematic zone and vascular tissues. Formation and elongation of the root system were significantly promoted by 3-amino-1,2,4-triazole (AT), but were markedly inhibited by N,N’-dimethylthiourea (DMTU) under Cd stress. The effect of $H_{2}O_{2}$ on Cd-stressed root growth was further confirmed by examining a gain-of-function rice mutant (carrying catalase1 and glutathione-S-transferase) in the presence or absence of diphenylene iodonium. DR5-GUS staining revealed close associations between $H_{2}O_{2}$ and the concentration and distribution of auxin. $H_{2}O_{2}$ affected the expression of key genes, including OsYUCCA, OsPIN, OsARF, and OsIAA, in the auxin signaling pathway in Cd-treated plants. These results suggest that $H_{2}O_{2}$ functions upstream of the auxin signaling pathway. Furthermore, $H_{2}O_{2}$ modified the expression of cell-cycle genes in Cd-treated roots. The effects of $H_{2}O_{2}$ on root system growth are therefore linked to auxin signal modification and to variations in the expression of cell-cycle genes in Cd-stressed rice. A working model for the effects of $H_{2}O_{2}$ on Cd-stressed root system growth is thus proposed and discussed in this paper.
File Format	HTM / HTML
ISSN	16729072
Issue Number	12
Volume Number	54
e-ISSN	17447909
Journal	Journal of Integrative Plant Biology
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2012-12-01
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Botany Cadmium Toxicity Genes, Cdc Hydrogen Peroxide Pharmacology Indoleacetic Acids Metabolism Oryza Sativa Genetics Plant Roots Drug Effects Signal Transduction Cytology Growth & Development Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Plant Science Biochemistry

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Hydrogen Peroxide-Mediated Growth of the Root System Occurs via Auxin Signaling Modification and Variations in the Expression of Cell-Cycle Genes in Rice Seedlings Exposed to Cadmium Stress

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Hydrogen Peroxide-Mediated Growth of the Root System Occurs via Auxin Signaling Modification and Variations in the Expression of Cell-Cycle Genes in Rice Seedlings Exposed to Cadmium Stress