Mapping QTLs for salt tolerance in rice
2003
Nguyen Thi Lang | Masood, S. | Yanahigara, S. | Bui Chi Buu
One hundred eight F8 recombinant inbred lines (RILs) derived from the cross Tesanai 2/CB were evaluated. These RILs were evaluated for seeding survival day (SD), dry root weight (Rt.wt), dry shoot weight (St.wt), Na+ and K+ content, and Na+/K+ ratio in culture solution (EC = 12 dS m¯¹). A linkage map was constructed using 108 RFLP markers and SSR markers covering 2,340.50 cM, with an average interval of 21.68 cM between marker loci. Markers associated with salt tolerance were located on chromosomes 1, 2, 3, 9, 11, and 12. Several QTLs were identified: four for SD, one for dry shoot weight, two for dry root weight, one for Na+ absorption, one for K+ absorption, and four for Na+/K+ ratio. The proportion of phenotypic variation explained by each QTL ranged from 5.2% to 11.6% for SD, and from 4.8% to 14.4% for morphological characters and Na+ and K+ accumulation. Common QTLs were observed on chromosomes 3 and 9 for quantitative traits (SD and Rt.wt, and SD and Na+/K+). Common QTLs were also detected on chromosome 12 for Na+/K+ and K+ content.
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