Genetic Relationships of Rice Yield and Yield Components in RILs Population Derived from a Cross between KDML105 and CH1 Rice Varieties.

There are many rice characteristics that contribute to the grain yield. This study aimed to characterize relationships of yield and yield components into direct and indirect effects, and to estimate the magnitude of genotypic and phenotypic variation, heritability and genetic advance. The study was conducted with 232 recombinant inbred lines (RILs) derived from a cross between low yield but good cooking quality, KDML105, and new plant type with high yield, CH1 rice variety. These lines were planted in RCBD with 3 replications. Data were collected for agronomic traits, yield components and yield. The results indicate that path coefficient analysis elucidated a positive direct effect on the number of panicles per plant (0.540) and the number of filled grains per panicle (0.510). Percentages of their direct effect were 62.11 and 74.68 %, respectively. These 2 traits demonstrate high significant value which could be used as selection criteria for yield improvement. Moreover, high values of heritability along with high genetic advance were observed for plant height, grain yield and the number of filled grains per panicle. Thus, these characters may serve as selection criteria combined with flag leaf length for improved high yield potential of rice. [ABSTRACT FROM AUTHOR]