Mycorrhizal symbiosis enhances tolerance to NaCl stress through selective absorption but not selective transport of K+ over Na+ in trifoliate orange

文献类型： 外文期刊

第一作者： Wu, Qiang-Sheng

作者： Wu, Qiang-Sheng;Zou, Ying-Ning;He, Xin-Hua;He, Xin-Hua

作者机构：

关键词： Arbuscular mycorrhizal fungi;Citrus;Ion selectivity;Potassium;Salt stress

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）

ISSN： 0304-4238

年卷期： 2013 年 160 卷

页码：

收录情况： SCI

摘要： Selectivity of potassium ion (K+) over sodium ion (Na+) is essential to understand plant's tolerance to salt stress, whereas information is limited whether arbuscular mycorrhizal fungi (AMF) increase selective absorption or transport of K+ over Na+ (SA(K+/Na+), or STK+/Na+) in host plants. The 61 -d-old trifoliate orange (Poncirus trifoliata) inoculated with or without an AM fungus Funneliformis mosseae was subjected to 45-day 100 mM NaCl stress. The AMF inoculation significantly increased plant growth (height, leaf number, stem diameter and biomass production), leaf relative water content (LRWC), and tissue K+ absorption but decreased Na+ absorption under no-NaCl or NaCl stress. Mycorrhization also significantly increased ratio of K+/Na+ in leaf, root and total plant under no-NaCl and NaCl stress. Meanwhile mycorrhizal seedlings showed higher SA(K+/Na+) under no-NaCl and NaCl stress, and higher STK+/Na+ under no-NaCl stress but lower STK+/Na+. under NaCl stress. In addition, SA(K+/Na+) significantly positively correlated with LRWC and almost all tested growth traits, whilst STK+/Na+ only with leaf number and root biomass. These results suggested that it was the mycorrhizal-mediated increase of SA(K+/Na+), rather than STK+/Na+, under NaCl stress, that could enhance the plant's tolerance to NaCl stress, thus conferring a greater LRWC and plant growth in mycorrhizal citrus seedlings. (C) 2013 Elsevier B.V. All rights reserved.

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