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

Pornpen SOMCHIT; Tanee SREEWONGCHAI; Prapa SRIPICHITT; Weerachai MATTHAYATTHAWORN; Saovaluck UCKARACH; Yaowamarn KEAWSAARD; Fisseha WOREDE

Authors

Pornpen SOMCHIT Department of Agronomy, Faculty of Agriculture, Kasetsart University, Bangkok 10900
Tanee SREEWONGCHAI Department of Agronomy, Faculty of Agriculture, Kasetsart University, Bangkok 10900 http://orcid.org/0000-0002-2893-330X
Prapa SRIPICHITT Department of Agronomy, Faculty of Agriculture, Kasetsart University, Bangkok 10900
Weerachai MATTHAYATTHAWORN Department of Agronomy, Faculty of Agriculture, Kasetsart University, Bangkok 10900
Saovaluck UCKARACH Department of Agronomy, Faculty of Agriculture, Kasetsart University, Bangkok 10900
Yaowamarn KEAWSAARD Department of Agronomy, Faculty of Agriculture, Kasetsart University, Bangkok 10900
Fisseha WOREDE Amhara Regional Agricultural Research Institute, Sirinka Agricultural Research Center

Keywords:

Correlation, path coefficient analysis, rice, yield, yield components

Abstract

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.

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