Department of Plant Breeding, G. B. Pant University of Agric. & Tech., Pantnagar
1Present address: Department of Plant Breeding and Genetics, G. S. Azad University of Agriculture and Technology, Kanpur-208 002.
In the present findings, five groups of toria population formed on the basis of plant height and maturity were subjected to two cycles of selection for seed yield. Groups showed considerable amount of variability among themselves for seed yield, plant-height, maturity and test weight. The selection for yield was effective in two groups (EN and MN) in first and only in one group (MT) in second cycle. Selection with grouping offered two advantages: faster rate of genetic gain in certain groups and partitioning of population into different homogeneous groups. However, there was one disadvantage and it was that the total genetic variability became limited and restricted within some groups resulting in little or no scope for future selection work. Number of seeds per siliqua and thousand seed weight appeared to be important yield contributing characters.
