Genetic effects of major QTLs controlling grain number (Grain number la (GNIa)) and number of primary branches per panicle (Wealthy Farmer's Panicle (WFP)) on the agronomic performance of different nerica varieties of rice (Oryza sativa L.)
2018
Reyes, V.P.
Rice grain yield is a quantitative trait determined by multiple genes. In this study the effect of major QTLs, from the donor parent ST12 and ST6, controlling grain number (Grain number la (Gnla) and number of primary branches per panicle (Wealthy Farmer's Panicle (WFP)) in the genetic background of 5 African rice varieties, introgressed by marker assisted backcross (MABC) breeding using indel markers for foreground selection and together with phenotypic selection were reported. Analysis on the performance of the improved lines with Gnla alleles from ST12 showed significant increase in the average number of total spikelets per panicle ( in all genetic backgrounds. While in lines with Gnla allele from ST6, showed significant increase in total number of spikelets per panicle in three genetic backgrounds (NERICA 4, WAB56-50 and WAB 56-104). Improved lines with WFP allele from ST12 showed significant increase in number of primary branches per panicle in three genetic background (NERICA 1, WAB 56-104, and WAB56-50). Evaluation of agromorphological traits suggests that Gnla and WFP allele causes pleiotropic effects on other agromorphological traits . Further, effects of these QTLs varies across seasons hence the need to further evaluate them on specific environments.
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