Evaluation of salt tolerance and screening for salt tolerant accessions of Medicago sativa and Medicago ruthenica at germination stage
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    Abstract:

    The objective of this study was to investigate the salt tolerance between Medicago sativa and Medicago ruthenica. Five wild alfalfa and five wild ruthenian medic from different areas were selected as test materials. Compared to the control, the salt stress of 0.3 %、0.6 %、0.9 %、1.2 %、1.5 % was used to explore the effect of tested materials in germination stage. The comprehensive evaluation of salt tolerant coefficients (STC) contained the germination rate (GR), germination energy (GE), germination index (GI), vital index (VI), root length (RL), seedling length (SL) and seedling dry weight (DW). The salt-tolerance comprehensive evaluation value (D value) were analyzed by variance analysis, correlation analysis, principal components analysis and subordinate function analysis. The results showed that different salt concentration and different materials had significant differences in the same index. There were different correlational relationships among different indexes. 2 indexes including GR and DW were closely related to the salt tolerance, the correlation value was 0.745 and 0.752. Besides, the materials of ruthenian medic came from Tongliao Daqinggou Nature Reserve and Wuchuan county near Hohhot of Inner Mongolia had the higher salt resistance, the D value and the correlation value was 0.807, 0.699 and 0.793, 0.716 respectively. To sum up, ruthenian medic are better than alfalfa in terms of salt resistance.

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History
  • Received:August 18,2016
  • Revised:October 21,2016
  • Adopted:October 21,2016
  • Online: May 19,2017
  • Published:
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