Field Crop Research 213 (2017): 89-99
ABSTRACT
Increasing rice production to feed the world ’s growing population will be a signi ficant challenge, particularly in the developing countries where Indica Group cultivars are predominantly grown. Rice genotypes suitable for water-saving conditions are also necessary to cope with current and predicted water scarcities. Here, we report a high-yielding introgression line, YTH183, derived from new-plant-type rice with an Indica Group cultivar (‘ IR64 ′ ) genetic background. 14 trials in three countries (Philippines, Indonesia, and Lao PDR) and comparison of grain yield with IR 64 and Philippine ’s high-yielding cultivars showed the superior performance of YTH183 under fl ooded and water-saving conditions. YTH183 signi ficantly increased harvest index without increasing total shoot biomass in the most of the trials. Among the yield components, 1000-grain weight signi ficantly and stably contributed to increased grain yield in YTH183. Genetic analysis revealed greater 1000-grain weight is controlled by the putative quantitative trait loci (QTL), qGW5-YP5 . Morphologically, YTH183 had steep root phenotype, a thicker culm, and a greater number of vascular bundles at the panicle neck than IR 64.
See: http://dx.doi.org/10.1016/j.fcr.2017.07.006
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