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The relation between fall dormancy rate and salt tolerance in alfalfa (Medicago sativa L.)
Experiments were conducted to study the relationship of fall dormancy and salt tolerance of alfalfa or lucerne (Medicago sativa L.). Seeds of eight cultivars of alfalfa (WL168HQ, WL319HQ, WL343HQ, WL363HQ, WL440HQ, WL525HQ, WL656HQ, and WL712HQ), whose fall dormancy rating (FDR) is 2.0, 2.8, 3.9, 4.9, 6.0, 8.2, 9.3 and 10.2, respectively were germinated in a growth chamber. Subordinate function value method (SFVM) was adopted in this paper to evaluate salt tolerance of eight alfalfa cultivars comprehensively. Seed germination rate (SGR), seed germination potential (SGP), seedling electrolyte leakage (SEL), seedling shoot length (SSL), seedling root length (SRL), seedlings fresh weight (SFW), seedling root-shoot ratio (R/S), seedling sodium concentration (SC), seedling potassium concentration (PC) and potassium and sodium ratio (K+/Na+) were used as the indices of evaluation. Under 1.2% salt treatment, salt tolerance rank was WL656HQ> WL440HQ> WL712HQ> WL525HQ> WL343HQ> WL319HQ> WL363HQ> WL168HQ, with FDR being 9.3, 6.0, 10.2, 8.2, 3.9, 2.8, 4.9, and 2.0, respectively. The results of this study showed that non-dormant cultivars were generally more salt tolerant than dormant cultivars.
CP17121 Accepted 01 November 2017
© CSIRO 2017