GENETIC VARIABILITY, HERITABILITY AND GENETIC ADVANCE FOR YIELD AND RELATING TRAITS IN RICE (ORYZA SATIVA L.) GENOTYPES INTRODUCED FROM IRRI IN MEKONG DELTA

Abstract

Two-hundred and fifty-two inbred rice genotypes introduced from IRRI were evaluated under standard field-evaluation condition in Mekong Delta. These genotypes were assessed for 08 quantitative traits and 04 qualitative traits concerning yield and other relating characteristics. The morphological data were subjected to Pearson correlation matrix, Principal Component Analysis and cluster analysis to determine the level of diversity and degree of association existing between evaluated traits. Yield and most relating traits exhibited higher GCV and PCV compared to growth parameters. Genetic advance as percent of mean ranged from 5.57% for spike length to over 100% for qualitative traits. High heritability estimation were recorded for maturity and qualitative traits (1.00) following by plant height, estimated yield (0.76) and grain filling rate (0.73). The PCA results suggests that grain density and estimated grain yield were the principal discriminatory traits for evaluated IRRI rice genotypes, which indicated that selection in favour of these traits might be effective in this population and environment.