Division of Genetics, Indian Agricultural Research Institute, Delhi-12
A study of 41 base populations derived from Indian, African and American sources of germ plasm for top-cross analysis in S0, S1 and S3 generations of testing showed that (a) I.P. 81 (Pusa Moti) was superior yielder per se when used as a control but was a poor combiner as a tester parent; (b) Seven S1 hybrids involving I.P. 232, I.P. 233, LP. 57, D. 1, I.P. 228, LP. 231, LP. 229 showed significant superiority for grain yield over their S0 hybrids in relation to the control; (c) 21 S3 hybrids yielded 43 to 261% higher than the control (1148 kg./ha); (d) Group comparisons showed superior significant performance of the exotic over indigenous materials for grain yield and its major components; (e) Tift 23A CMS line hybrid group was significantly superior as compared to Tift 18A hybrid group for grain yield, tillering and grain density.
