Genetic variability, heritability and associations between yield attributes and grain quality traits in rice (Oryza sativa L) [electronic resource].

Includes references.

Information on genotypic (GCV) and phenotypic (PCV) coefficients of variability, broad sense heritability, genetic advance and phenotypic correlation coefficients were ohtaioed for 22 yield attrihutes and several grain quality characters of 24 local and exotic rice genotypes grown at the farm of Rice Research and Training Ceoter, Sakha,Kafr El-Sheikh ,Egypt during 200t and 2002 seasons. Results revealed that 100-grain weight, nnmber of filled grains/panicle, grain elongation, days to 50% heading, number of panicles/plant, and grain yield/plant had high coefficient of variation at both the genotypic (GCV) and phenotypic (PCV) Levels. Broad-sense heritability estimates were low to high for all characters studied and ranged from 30% to 89% for graio elongation and panicle weight, respectively. Expected genetic gain as a percentage of the population mean was high for most studied traits. However, high heritability coupled with high genetic advance were recorded for 100-grain weight, panicle weight, number of primary branches/panicle, grain shape, grain length and panicle length suggesting the preponderance of additive gene effects in the expression of these traits. Grain yield/plant exhihited positively strong positive-correlation with number of panicles, panicle weight, number of primary branches/panicle, and number of filled grains/panicle, but it was negatively associated with sterility % and Hulling %. Gelatinization temperature was significantly positively correlated with grain length, graio elongation and amylose content (%). Key words: Rice, Genetic variability, Genetic advance, Heritability, Correlation, Field components, Grain quality characters.

Summary in Arabic.

1