Chromosomal abnormality behaviors and morphological evaluation of genotypes derived from hybrids of Kerman endemic cotton and VTDL variety of Arboreum

This study was carried out in order to investigate on chromosomal behavior during meiosis in Kerman endemic cotton (Gossypium herbaceum) and VTDL (G. arboretum) species, F1 hybrids of two species and BC4 genotypes. The F1s investigations showed that in 40 percent of tested cells, there was one adjacent quadrivalent. Only in one case there was one lag chromosome at MII and the rest of next meiosis stages were normal. Repeated back crosses (up to BC4) caused to reduce the irregularities. Morphological traits in back crosses, were mostly similar to G. herbaceum and only in few cases were left from G. arboretum species. Since simultaneously breeding for all traits, especially through far hybridization, is not possible at one stage, so the resulted offspring would be great achievement at the early steps of endemic cotton improvement.