Role of heterosis and inbreeding depression in the inheritance of grain yield and its components in wheat (Triticum aestivum L.)

摘要

Heterosis for crop yield and yield components of the P1, P2, F1, F2, BC1 and BC2 populations of three bread wheat crosses (UP-301 x RAJ-3077, CPAN-3004 x HD-2329 and HD-2428 x RAJ 1482) was evaluated in the field during the rabi season of 1994-95. Significant positive heterosis was observed for most of the traits except plant height and grain yield in UP-301 x RAJ-3077, plant height in CPAN-3044 x HD-2329, and plant height and grain yield per plant in HD-2428 x RAJ-1482. Inbreeding depression in segregating populations was also observed for most of the characters except number of days to heading in UP-301 x RAJ-3077 and HD-2428 x RAJ-1482.