Evaluation of Medicago truncatula ecotypes for resistance to salinity

Document Type : Research Paper

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Thirteen ecotypes of Medicago truncatula from Iran and Australia were evaluated forsalt tolerance under normal and stress conditions using a factorial experiment. In both of the conditions a high amount of diversity was observed. Results of correlation analysis showed that leaf number is one of the most important traits for increasing forage yield. Moreover, correlation between plant height and K or Na concentration was significant and negative. According to principal components analysis, the first three principal components with eigen values of more than 1 contributed 73.7% of the variability amongst the ecotypes. PC1 positively correlated to leaf number, tillage number and shoot fresh anddry weights. Characters with the biggest values on PC2 were root fresh weight, root dry weight and K concentration. Whereas, PC3 was positively correlated to plant height and Na concentration. The ecotypes were grouped into two main clusters using cluster analysis. In the first cluster, tolerance and in the second cluster susceptible ecotypes were observed.The results could be used for germplasm management and also in breeding programs

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