PJB-2018-988
GENETIC VARIABILITY, PATH COEFFICIENTS ANALYSIS AND CLUSTER ANALYSIS FOR PHENOLOGICAL CHARACTERS OF PREDOMINANT UPLAND RICE GENOTYPES IN SOUTHERN THAILAND
SHAMS SHAILA ISLAM1
Abstract
This research purposes to evaluate genetic variability with regards to genetic advance, path coefficients analysis with direct and indirect effects as well as cluster analysis between ten popular upland rice genotypes (Oryza sativa L.) of southern Thailand from yield and yield component traits. The highest and lowest σ_g^(2 )are found from grain yield per genotypes (7735.3333) in addition for harvest index (0.0042). Similarly, the maximum and minimum σ_p^2 are found from grain yield per genotypes (112167.4444) and harvest index (0.0069). High genotypic coefficient of variation and phenotypic coefficient of variation values for total grain weight, total dry weight, harvest index, filled grains per plant also for leaf area index show that assortment of these yield contributing characters would be effective. The path analysis indicates that plant height (0.339), unfilled grains per plant (0.212), flag leaf width (0.176), total dry weight (0.156), filled grains per plant (0.122), 1000 seed weight (0.103), tiller number per plant (0.098), panicle number per plant (0.05), panicle length per plant (0.037) and total grain weight (0.007) have positive and direct effect. Cluster analysis assembled 10 genotypes obsessed by groups I, II and III containing three, four as well as three genotypes, respectively. Consequently, upland rice grain yield development would be augmented exclusively in terms of tiller number per plant, panicle number per plant, flag leaf width, total dry weight, total grain weight, filled grains and unfilled grains per plant because these yields and yield contributing characters have high, positive, direct phenotypic effects on upland rice yield.
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