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GENETIC MAPPING OF QTLs, CONTROLLING SHOOT FRESH AND DRY WEIGHT UNDER SALT STRESS IN RICE (ORYZA SATIVA L.) CROSS BETWEEN Co39 × MOROBEREKAN
Abstract
A mapping population of 120 recombinant inbred lines (RILs) derived from the cross between Co39 (lowland, Indica) and Moroberekan (upland, Japonica) rice (Oryza sativa L.) cultivars was used to map QTLs associated with shoot growth traits under salinity on all chromosomes of rice. The dilution of salt concentration in shoot tissues by higher vegetative growth is an established mechanism of salt tolerance in plants. The fresh weight of shoots was recorded after 42 days of growth at 100 mol m–3 NaCl + 5.0 mol m–3 CaCl2 in nutrient solution in a flood bench system. We also determined shoot dry weight and shoot fresh/dry weight ratio traits from the above data. A total of 7 QTLs for 3 shoot growth traits were detected on chromosomes–1
