Heterosis for Yield and Yield Components in Upland Cotton (Gossypium hirsutum L.)

摘要

Heterosis was studied in 49 crosses over check (HS-6) in a line × tester analysis for yield and yield contributing attributes in American cotton. Significant heterosis was observed for almost all the characters for several crosses except lint index.High heterotic effects were recorded for seed index, number of bolls, boll weight, seed cotton yield; whereas, low for ginning out-turn. High heterotic expression in yield seemed to be associated with high degree of heterosis for boll weight and number of bolls per plant. Economic helerosis (over check variety) was high in H-1021×S-12(160.37%)crosscombination which yielded highest cotton seed yield per plant and hence, could he utilised in further breeding programmes.