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Superoxide radical and auxin are implicated in redistribution of root growth and the expression of auxin and cell-cycle genes in cadmium-stressed rice

文献类型： 外文期刊

作者： Zhao, F. Y. 1 ; Hu, F. 1 ; Han, M. M. 1 ; Zhang, S. Y. 2 ; Liu, W. 1 ;

作者机构： 1.Shandong Univ Technol, Coll Life Sci, Zibo 255049, Shandong, Peoples R China

2.Shandong Rice Res Inst, Jining 272077, Shandong, Peoples R China

关键词： cadmium: 7440-43-9;superoxide dismutase: 9054-89-1;EC 1.15.1.1;Tiron: 149-45-1;superoxide radical: 11062-77-4;indole-3-butyric acid: IBA;133-32-4;2;3;5-triiodobenzoic acid: TIBA;sodium diethyldithiocarbamate: DDC;148-18-5;root growth;cell-cycle

期刊名称：RUSSIAN JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：1.481； 五年影响因子：1.608 ）

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收录情况： SCI

摘要： Changes of root growth and the expression of auxin and cell-cycle genes were analyzed in rice (Oryza sativa L. cv. Zhonghua No. 11) treated with Cd alone, Cd plus TIBA (2,3,5-triiodobenzoic acid, an inhibitor of polar auxin transport) or IBA (indole-3-butytric acid) and Cd plus Tiron (a scavenger of O (2) (center dot-) or DDC (sodium diethyldithiocarbamate, a superoxide dismutase inhibitor). It was shown that Cd-stimulated rice root growth can be further enhanced by Cd plus IBA or DDC treatments but can be significantly suppressed following Cd together with Tiron or TIBA application. A comprehensive expression analysis of auxin genes, such as OsPID, OsPINs (Pin-Formeds), OsARFs (auxin response factors), and core cell-cycle genes, such as CDKs and CYCs in differently treated roots was conducted by semi-quantitative RT-PCR. The results showed that the expressions of 21 out of 35 tested auxin genes and 51 out of 63 tested cell-cycle genes were regulated by various treatments. Among the modified expression profiles of 72 genes, 53 and 59 genes were up- or down-regulated by auxin (including Cd plus TIBA or IBA treatments) and O (2) (center dot-) (including Cd plus Tiron or DDC treatments), respectively. In the roots treated with Cd plus IBA or TIBA, the expressions of 39 genes changed differently from those under single Cd treated roots. Following Cd plus DDC or Tiron treatment, the transcripts of 36 genes were also altered differently from those under single Cd treatment. Obviously, auxin and O (2) (center dot-) affected the expression of auxin and core cell-cycle genes under Cd stress. Taken together, our results indicated that in Cd-stressed rice plants, O (2) (center dot-) and auxin were implicated in the redistribution of root growth and the expression of auxin and cell-cycle genes.

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