EFFECTIVENESS OF DIFFERENT SELECTION METHODS IN SEGREGATING POPULATION OF RICE (0. SATIVA L.) IN ARC 10372 X IR 36 IN DIFFERENT ENVIRONMENTS

Abstract

Effectiveness of different selection methods (pedigree, bulk and SSD) in segregating population of rice cross ARC 10372 X IR 36 were worked out under different environments, viz. selected and tested in irrigated conditions, selected in upland and tested in irrigated conditions, selected in irrigated and tested in upland conditions and selected and tested in upland conditions. Substantial variability for yield and its components in F2 gradually declined with the i~creaseof mean values in subsequent generations of selection from F2 base population and varied from method to method and selection in different environments. Heritabilityvalues gradually increased with the advancementofgeneration. Whenever heritability was high in the early generations, it continues to remain high even after subsequent cycles ofselection. Bulk and SSD methods were superior in retaining and maintaining the high yielding lines in comparison to pedigree method of breeding. However, genotype X environment X method interaction had much bearing in changing the expression of yield and its components.