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KMID : 0368420200630040311
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Journal of Plant Biology
2020 Volume.63 No. 4 p.311 ~ p.320
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Ethylene was Involved in Ca2+-Regulated Na+ Homeostasis, Na+ Transport and Cell Ultrastructure During Adventitious Rooting in Cucumber Explants Under Salt Stress
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Yu Jian
Yu Jihua
Liao Weibiao
Xie Jianming
Niu Lijuan
Zhang Guobin
Lv Jian
Xiao Xuemei
Wu Yue
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Abstract
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Salt stress as one of main abiotic stresses damaged plant growth and development. In this study, the effects of ethylene on Ca2+-regulated rooting index, Na+ and K+ concentration, Na+ transportation and cell ultrastructure during adventitious rooting in cucumber (Cucumis sativus L.) under salt stress were investigated. The results showed that ethylene might play a positive role in Ca2+-regulated rooting index during adventitious rooting under salt stress. Moreover, CaCl2 treatment significantly decreased the intracellular Na+ level but increased K+ content of cucumber explants under salt stress. However, the Na+ and K+ concentration which treated with Ca2+ treatment was significantly influenced by ethylene inhibitors under salt stress. Our results also showed that ethylene might be involved in Ca2+-affected cell ultrastructure of cucumber explants under salt condition. Further analysis showed that ethylene might be responsible for Ca2+-regulated Na+ transport through enhancing the transcriptional and protein levels of Na+/H+ antiporter as well as H+-ATPase for alleviating the negative effects of NaCl stress. Therefore, ethylene might act as a downstream signaling molecule of Ca2+ to maintain Na+ and K+ homeostasis via regulating Na+ transport and preserve the integrity of cellular ultrastructure of cucumber explant during adventitious rooting under salt condition.
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KEYWORD
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Calcium ion, Ethylene, Na+ transport, Adventitious rooting, Salt stress
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