文献类型： 外文期刊

作者： Guo, Kun-Mei ¹ ; Babourina, Olga ¹ ; Christopher, David A. ³ ; Borsics, Tamas ³ ; Rengel, Zed ¹ ;

作者机构： 1.Univ Western Australia, Sch Earth & Geog Sci, Crawley, WA 6009, Australia

2.Shanxi Acad Agr Sci, Dryland Agr Res Ctr, Beijing 030031, Peoples R China

3.Univ Hawaii, Dept Mol Biosci & Bioengn, Honolulu, HI 96822 USA

期刊名称：PHYSIOLOGIA PLANTARUM （ 影响因子：4.5； 五年影响因子：4.576 ）

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收录情况： SCI

摘要： Cyclic nucleotide-gated channels (CNGCs) in the plasma membrane transport K and other cations; however, their roles in the response and adaptation of plants to environmental salinity are unclear. Growth, cation contents, salt tolerance and K fluxes were assessed in wild-type and two AtCNGC10 antisense lines (A2 and A3) of Arabidopsis thaliana (L.) Heynh. Compared with the wild-type, mature plants of both antisense lines had altered K and Na concentrations in shoots and were more sensitive to salt stress, as assessed by biomass and Chl fluorescence. The shoots of A2 and A3 plants contained higher Na concentrations and significantly higher Na/K ratios compared with wild-type, whereas roots contained higher K concentrations and lower Na/K ratios. Four-day-old seedlings of both antisense lines exposed to salt stress had smaller Na/K ratios and longer roots than the wild-type. Under sudden salt treatment, the Na efflux was higher and the K efflux was smaller in the antisense lines, indicating that AtCNGC10 might function as a channel providing Na influx and K efflux at the root/soil interface. We conclude that the AtCNGC10 channel is involved in Na and K transport during cation uptake in roots and in long-distance transport, such as phloem loading and/or xylem retrieval. Mature A2 and A3 plants became more salt sensitive than wild-type plants because of impaired photosynthesis induced by a higher Na concentration in the leaves.