Cytomorphology of Haploid Gossypium Hirsutum X G. Anomalum

An interspecific hybrid (A_2/2 D₂ B₁) between haploid G.hirsutum L. (2n=2x=26, A₂ D₂) and G. anomalum Waw. & Peyr. (2n=26, 2B₁ B₁) has been obtained. Its morphological characters and meiosis were studied. The sterility in the hybrid is explained from its cytological analysis. The hybrid had 2n=26 chromosomes with an average of 7.2¹¹ per PMC, the rest being univalents and exceptionally trivalents. Second meiotic division was highly irregular giving rise to abnormal tetrads containing 1–8 sporads and sterile pollen grains. An amphidiploid with 2n=52 (A₂ D₂B₁ B₁) chromosomes from this combinations is likely to be a good source for securing combinations for jassid and blackarm resistance and desirable fibre quality characters like length., strength and fineness.