Heterosis studies for yield and its components in breadwheat (Triticum aestivum L.)

A set of diallel crosses involving 10 parents was made to have information on the extent of heterosis over better parent (BP) and standard variety (SV) for yield and yield contributing characters including some of the physiological traits. The maximum better parent heterosis for grain yield per plant was observed to be 59.7 per cent. The extent of standard heterosis however, was not of appreciable magnitude being 27.3 per cent for grain yield per plant. Magnitude of heterosis over better parent indicated that grain yield per plant was the most heterotic character next only to biological yield per plant. The crosses showing heterosis for grain yield were not heterotic for all the characters.