ABSTRACT
The evaluation of phenotypic variability, heritability and genetic advance in germplasm collections is important for both plant breeders and germplasm curators to optimize the use of the variability available. A total of 50 sesame accessions were used in this research work. Analysis of variance revealed significant difference among genotypes for all the nine characters studied. The magnitude of PCV and GCV was moderate to high for seed yield per plant, number of capsules per plant and number of branches per plant. High heritability was recorded for days to maturity, days to 50% flowering, seed yield per plant, number of capsules per plant and number of branches per plant. High heritability combined with high genetic advance was recorded for seed yield per plant, number of capsules per plant and number of branches per plant indicating that these characters are controlled by additive gene effect and phenotypic selection of these characters would be effective for further breeding purpose.
ABSTRACT
A collection of 280 sesame genotypes of different ecogeographical origin was evaluated using augumented block design along with four checks. Analysis of variance revealed the presence of significant variability among genotypes for all the characters studied. The highest heritability coupled with highest genetic advance was observed for capsules per plant indicating the predominance of additive gene effects. Whereas lower estimates of heritability and genetic advance was revealed for days to maturity and capsule length suggesting the presence of nonadditive gene action for controlling these traits. Based on diversity the genotypes were grouped into 12 clusters and highest intercluster distance was observed between cluster VI & XII followed by cluster VI & IX, cluster II & VI and cluster III & IV. Among the traits studied capsule per plant and plant height contributed maximum for studying divergence while no contribution from capsule length. Hybridization involving genotypes of cluster VI with KMR 3 (cluster XII) may result in exploiting maximum heterosis to produce desirable transgressive segregants for crop improvement.
ABSTRACT
Genetic variability, character association and path analysis between yield and its contributing traits were studied in 49 Rice cultures. Analysis of variance revealed the existence of significant differences among genotypes for all characters studied. The magnitude of PCV and GCV was moderate to high for number of grains per panicle, test weight and grain yield. High heritability coupled with high genetic advance as per cent of mean was observed for test weight and grain yield indicating the role of additive gene in expressing these traits. Grain yield was significant positively correlated with number of grains per panicle, panicle length and test weight. Path coefficient analysis indicated that number of grains per panicle, test weight and productive tillers per square meter were essential traits to be considered for realizing the improvement in yield.
ABSTRACT
Correlation and path coefficient analysis was carried out for yield and yield components in 21 gall midge resistant rice genotypes. Number of grains per panicle, days to 50% flowering and panicle length had a significant positive association with yield and also had a positive direct effect on grain yield. These traits contributed maximum to higher grain yield compared to other characters, thus, selection for these characters helps in selection of superior gallmidge resistant genotypes in rice.