Scientia Agricultura Sinica ›› 2011, Vol. 44 ›› Issue (1): 185-191 .doi: 10.3864/j.issn.0578-1752.sas-2010-07082

• RESEARCH NOTES • Previous Articles     Next Articles

Study on Main Na+ Exclusion Localization and Na+/H+ Antiport Activity of Buckwheat

MA De-yuan, ZHAN Wei-yan, YANG Hong-bing, YI Yan-jun
   

  1. (青岛农业大学生命科学学院)
  • Received:2010-07-26 Revised:2010-08-07 Online:2011-01-01 Published:2011-01-01
  • Contact: YANG Hong-bing

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Abstract:

【Objective】The objective of this experiment is to determine the main Na+ exclusion localization of buckwheat (Fagopyrum esculentum Moench) and the correlation between proton pump and Na+/H+ antiport activity with Na+ exclusion property. 【Method】Buckwheat varieties Chuanqiao 1 (salt-tolerant variety) and TQ-0808 (salt-sensitive variety) were used as experimental materials. Na+ exclusion capability of different parts was determined through “pressure chamber” method extruding xylem juice. Proton pump and Na+/H+ antiport activity were also determined by sucrose density gradient centrifugation method separating plasmolemma and tonoplast. 【Result】The main Na+ exclusion localization of salt-sensitive variety was in roots, while that of salt-tolerant one was in roots and stem base, and the whole Na+ exclusion capability of salt-tolerant variety was obviously higher than that of salt-sensitive one. Proton pump and Na+/H+ antiport activity of salt-tolerant variety were obviously higher than that of salt-sensitive one in the same salinity treatment. It indicated that Na+ extrusion capability and Na+ circumscription capability of the main Na+ exclusion localization cell in salt-tolerant variety were obviously higher than that in salt-sensitive one. 【Conclusion】Na+ circumscription of the main Na+ exclusion localization in salt-tolerant variety played an important role in restricting transportation Na+ to shoot, which was the main way to Na+ exclusion of main Na+ exclusion localization in salt-tolerant buckwheat variety.

Key words: buckwheat, NaCl, Na+ exclusion capability, Na+ exclusion localization, Na+/H+ antiport activity

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