Genetic diversity, genetic variability, and path analysis for yield and its components in indigenous upland rice ( Oryza sativa L. var. glutinosa)

摘要

Genetic diversity, genetic variability, and relationships of yie ld 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 coeff icients 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 pe r panicle and the number of panicles per plant. Cluster analysis grouped the 22 g enotypes into groups I, II, and III, and the out - groups consisting of nine, five, six, and two genotypes. These results may facilitate upland rice breeding programs to improv e yield.