Relation between level of autumn dormancy and salt tolerance in lucerne (Medicago sativa)
Kunyong Huang A D , Xiaoxia Dai A D , Yiquan Xu A , Shibing Dang A , Tianran Shi A , Jianmin Sun B and Kehua Wang A C
+ Author Affiliations
- Author Affiliations
A Department of Grassland Science, China Agricultural University, Beijing 100193, China.
B Beijing Clover Group Co. Ltd., Beijing, 100029, China.
C Corresponding author. Email: kehwang@cau.edu.cn
D These authors contributed equally to this work.
Crop and Pasture Science 69(2) 194-204 https://doi.org/10.1071/CP17121
Submitted: 27 March 2017 Accepted: 1 November 2017 Published: 22 January 2018
Abstract
Experiments were conducted to study the relationship between autumn (fall) dormancy rating (FDR) and salt tolerance of lucerne (alfalfa, Medicago sativa L.). Seeds of eight cultivars with different FDRs (range 2.0–10.2) were germinated in a growth chamber under five concentrations of NaCl (range 0–1.2%). A subordinate function value method was adopted for comprehensive evaluation of salt tolerance of the lucerne cultivars. Seed germination rate and germination potential, and seedling electrolyte leakage, shoot length, root length, fresh weight, root : shoot length ratio, Na+ and K+ concentrations and K+ : Na+ ratio were used as the indices of evaluation. Under 1.2% salt treatment, salt-tolerance ranking of the cultivars was WL656HQ > WL440HQ > WL712HQ > WL525HQ > WL343HQ > WL319HQ > WL363HQ > WL168HQ, with respective FDRs of 9.3, 6.0, 10.2, 8.2, 3.9, 2.8, 4.9 and 2.0. The results of this study show that non-dormant cultivars were generally more salt tolerant than dormant cultivars.
Additional keyword: fall dormancy rating.
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