Heterosis Component Studies in Upland Cotton
Feb 11, 2019
Heterosis is by far the most important and effective tool in the hand of crop breeders for effecting rapid improvement in the yield and others economic attributes. Study of heterosis and inbreeding depression has a direct bearing on the breeding methodology to be employed for genetic improvement. In the present study, four diverse parents present of American Upland Cotton, g Bikaneri Narma, Model, Ganganagar Ageti and DP-16 were crossed to make hybrids. Data were recorded for seed cotton yield per plant and on its contributing traits. From the weighted least square estimates of components of generation means, components of heterosis were calculated. Heterosis in the F1 could be obtained if no mutual cancellation of components of heterosis occur. Over the over dominance as the predominant assignable cause of the heterosis was ruled out by observation of a higher magnitude of dominance (h) and its interaction components than of the additive (d) component.