Cummings Laboratory, Division of Genetics, I.A.R.I., Delhi-12
*present address: I.A.R.I., R. R. S., Rajendranagar, Hyderabad—30 (A.P.)
The nature of gene interactions in two heterotic hybrids CSH-1 and CSH-2 show that heterosis for yield could result from divergent mechanisms. In CSH-1 it is the additive (d’) and additive X additive (i) components which were effective in contributing to increased yields. In CSH-2 the components h and l are in the same direction and are of considerable magnitude. The implications of the differences in the nature of gene action in influencing developmental mechanisms and selection procedures are discussed.
