GENETIC VARIATION FOR YIELD TRAITS IN MAGIC INDICA PLUS POPULATION AND INDIAN RICE GERMPLASM
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Genetic diversity represents the heritableÂ variation within and between populations ofÂ accessions. The success of plant breeding dependsÂ on the available genetic variability both indigenous asÂ well as exotic to cater to the need of various farmingÂ situations of rice. Higher grain production is the primaryÂ trait targeted for the improvement of rice productivity inÂ both favourable and unfavourable environments fromÂ its present level. Knowledge of the genetic architectureÂ of genotypes is necessary to formulate efficient breedingÂ methodology. It is essential to find out the relativeÂ magnitude of additive and non additive geneticÂ variances, heritability, and genetic gain about theÂ characters of concern to the breeder. The cropÂ improvement program generally involves generation of
genetic variability, selection, and yield evaluation trailsÂ to evolve promising varieties. The large spectrum ofÂ genetic variability in segregating populations dependsÂ on the level of genetic diversity among genotypes thatÂ are chosen for hybridisation. Besides, heritability and
genetic advance are other important selectionÂ parameters. The evaluation of heritability helps the plantÂ breeder in determining the character for which selectionÂ would be rewarding. The breeders are interested inÂ the selection of superior genotypes based on theirÂ phenotypic expression. The major function of heritabilityÂ estimates is to provide information on the transmissionÂ of characters from the parents to the progeny. Heritability
estimates along with genetic advance are normallyÂ helpful in predicting the gain under selection thanÂ heritability estimates alone. Keeping in view theÂ importance of the subject, an attempt was made toÂ estimate genetic variability in rice MAGIC indica plusÂ lines along with rice accessions and four checks.