Genotype × Environment Interactions For Seed-Oil And Protein Content In Cotton (Gossypium Hirsutum L.)

Pattern of inter- and intraseasonal variation for seed-oil and protein content was examined in 10 elite cultivars and 5 experimental hybrids for 3 years. The cultivars showed a general trend of decrease in oil content at the third harvest in each year, but different levels of protein over the years and harvests. Effects of years, cultivars, harvests, and their two-factor interactions were highly significant for oil content. Third order interaction of years × cultivars × harvest times was not significant. A small increase in oil content over parents was recorded in the F₁ and decline in F₂. Protein content was relatively lower in the F₁, as compared to the respective parents.