Suwansa Chuchert, Charassri Nualsri, Nattapon Junsawang, and Watcharin Soonsuwon

DOI: 10.14456/sjst-psu.2018.73

pp. 609 - 616

Abstract

Genetic diversity, genetic variability, and relationships of yield and its components are very important data for plant
breeders that affect the design of a breeding program. Twenty-two upland rice genotypes were evaluated. The genotypes
indicated significant variations in nine traits. High phenotypic and genetic coefficients of variation were observed for yield per
plant, number of panicles per plant, and number of spikelets per panicle. High broad-sense heritability and genetic adaptations
were found for yield per plant. Positive significant correlations were recorded between flag leaf length, number of panicles per
plant, and number of spikelets per panicle. The highest direct effects on yield were attributed to the number of spikelets per
panicle and the number of panicles per plant. Cluster analysis grouped the 22 genotypes into groups I, II, and III, and the outgroups consisting of nine, five, six, and two genotypes. These results may facilitate upland rice breeding programs to improve
yield.