Comparative efficiency of pedigree, modified bulk and single seed descent breeding methods of selection for developing high-yielding lines in rice (Oryza sativa L.) under aerobic condition
AbstractThe knowledge about the relative efficiency of the different breeding methods may greatly help the plant breeder in selecting a
better method to be adopted in a particular crop. In the present experiment, the comparative efficiency of three selection
methods, viz., pedigree, modified bulk and single seed descent (SSD) were assessed in F3, F4, F5 and F6 generations of a cross
combination Moroberekan/IR20 of rice. Bulk population showed superiority over pedigree for grain yield, panicle length, number
of panicles, number of tillers and harvest index in F3 generation. Pedigree method was found to be superior over bulk and SSD
for grain yield per plant in F4 and F5 generations. In the three breeding methods, mean values of grain yield showed directional
shift across the generations. In F6 generation, the pedigree-derived lines showed higher superiority over mean value than lines
derived from SSD and modified bulk for grain yield, number of panicles and harvest index. No significant differences existed
between pedigree and modified bulk-derived F6 lines for grain yield and harvest index. Inter-generation correlation coefficients
were significant and positive between all the generations for grain yield, number of tillers and number of panicles. Significant
and positive correlations were observed between these three characters across generations supporting the intergeneration
correlation results. Visual selection based on the number of tillers and number of panicles per plant was very effective for
increasing yield in bulk and pedigree methods.
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