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Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (2): 508-514.doi: 10.13287/j.1001-9332.202002.005

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Effects of root abscisic acid on Na+ transport and photosystem Ⅱ in Helianthus tuberosus under salt stress

BIAN Tian-tian1,2, YAN Kun2, HAN Guang-xuan2, AN Meng-xin3, YANG Run-ya1*   

  1. 1School of Life Sciences, Ludong University, Yantai 264025, Shandong, China;
    2CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences CAS, Yantai 264003, Shandong, China;
    3School of Agriculture, Ludong University, Yantai 264025, Shandong, China
  • Received:2019-08-11 Online:2020-02-15 Published:2020-02-15
  • Contact: * E-mail: yry74@163.com
  • Supported by:
    This work was supported by the Key Deployment Project of Chinese Academy of Sciences (KFZD-SW-112) and the Natural Science Foundation of Shandong Province (ZR2017QC005).

Abstract: The effects of root abscisic acid (ABA) signal on Na+ transport and photosystem Ⅱ (PSⅡ) in Jerusalem artichoke (Helianthus tuberosus) under salt stress (150 mmol·L-1 NaCl) were examined by applying ABA synthesis inhibitor sodium tungstate to roots. Sodium tungstate inhibited ABA synthesis in roots, reduced root Na+ efflux, and increased the efficiency of Na+ transport from roots to leaves under salt stress. Salt stress increased leaf Na+ content and did not affect leaf membrane lipid peroxidation, PSⅡ reaction center protein and PSⅡ maximum photochemical efficiency (Fv/Fm ). The inhibition on root ABA synthesis significantly increased leaf Na+ accumulation, aggravated leaf membrane lipid peroxidation, impaired PSⅡ reaction center protein, decreased Fv/Fm, and induced PSⅡ photoinhibition. In conclusion, root ABA signal was beneficial to reducing leaf Na+ accumulation and preventing PSⅡ oxidative damage by inducing root Na+ efflux and inhibiting Na+ transport to the aerial part in H. tuberosus under salt stress.