Genome-wide association mapping of aluminum tolerance in Medicago truncatula

doi:10.11686/cyxb20130421

Abstract

Abstract: Aluminum (Al) toxicity is a major limiting factor of crop production in acidic soils, which make reduction of crop production every year. Medicago truncatula, a close relative of alfalfa, which is distributing in the world, is used as a source of genes to improve cultivated alfalfa (Medicago sativa). We screened 62 diverse M. truncatula accessions, conducted a genome-wide association (GWA) study using Al tolerance based on relative root growth. Fifty-eight SNPs associated with Al tolerance were identified by GWA analysis. These genes containing or neighboring to SNPs were annotated and analyzed. The results showed that they participated in cell wall, lipids metabolism, stress response process, redox regulation and small molecular transport. Using Al tolerance relative SNPs by genomic selection for predicting RRG (relative root growth) in M. truncatula accessions, and the predictive ability was estimated as 0.80. The results indicated that SNPs identified by GWA in this study could be used for improvement of Al tolerance in M. truncatula and M. sativa.

CLC Number:

JIANG Ge-ge, SONG Li-li, GUO Dong-lin, CAI Hong-sheng, GUO Chang-hong, SHU Yong-jun. Genome-wide association mapping of aluminum tolerance in Medicago truncatula[J]. Acta Prataculturae Sinica, 2013, 22(4): 170-178.

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