Variation in yield attributing traits and genetic parameters estimates of some advanced promising lines of upland rice (Oryza sativa L.) grown under shade conditions

Abstract

Efforts to develop upland rice need to be supported by plant breeding programs by assembling superior upland rice varieties. Eight advanced promising lines developed through a hybridization breeding program and two check varieties were used to study. The study conducted in Langgea Village (4°3’24”S and 121°27’59”E), Ranomeeto District, South Konawe Regency, Southeast Sulawesi. The experiment arranged in a split-plot design using randomized complete block (RCB) and three replications. Shade treatments arranged as main plots and the different of upland rice promising lines as subplots. The parameters observed were included vegetative and generative character. The results showed that the genotypes significantly differed in grain yield and yield attributing traits. The estimation of genetic parameters of some upland rice promising lines for grain yield and yield attributing traits indicated that total grain per panicle and leaf area had high both genotypic and phenotypic coefficient variance. There were genotypic diversity values on the appearance of some upland rice promising lines at a low light intensity, which had the highest value on the total grain per panicle (282.13) and the lowest value on the grain weight per clump (1.02).