ĐÁNH GIÁ KHẢ NĂNG KẾT HỢP VÀ ƯU THẾ LAI VỀ TÍNH TRẠNG NĂNG SUẤT VÀ CHẤT LƯỢNG XƠ CỦA CÁC CON LAI KHÁC LOÀI GIỮA BÔNG LUỒI (GOSSYPIUM HIRSUTUM L.) VÀ BÔNG HẢI ĐẢO (GOSSYPIUM BARBADENSE L.)
ĐÁNH GIÁ KHẢ NĂNG KẾT HỢP VÀ ƯU THẾ LAI VỀ TÍNH TRẠNG NĂNG SUẤT VÀ CHẤT LƯỢNG XƠ CỦA CÁC CON LAI KHÁC LOÀI GIỮA BÔNG LUỒI (GOSSYPIUM HIRSUTUM L.) VÀ BÔNG HẢI ĐẢO (GOSSYPIUM BARBADENSE L.)
Estimates on combining ability and heterosis for yield traits and fiber quality in interspecific F1 of Gossypium hirsutum L. Gossypium barbadense L.
The objective of this study was to estimate the general combining ability (GCA) of the parents and specific combining ability (SCA) of hybrids, to identify good parents and hybrid combinations for yield traits, quality fiber and can determine the heterosis of F1 hybrid combinations. In this study, 15 F1 hybrid combinations developed from line x tester mating design by crossing 3 lines (L591, L1530, L1598) and 3 testers (HD138, HD139, HD147). Results analysis of variance components in some yield and fiber quality traits showed that the phenotypic expression of these traits are controlled by additive genes and non-additive genes. Except ginning percentage traits is controlled equal by additive genes. Bolls per plant, boll weight, seed cotton yield, ginning percentage, fiber strength, fiber fineness were influenced by additive gen effects, particularly fiber length is influenced by non-additive gen effects. GCA were highly significant for L591 and HD138 for bolls per plant, boll weight, seed cotton yield, fiber length and fiber strength. GCA were highly significant for L591 x HD138 bolls per plant, seed cotton yield, fiber length and fiber strength. Result heterosis estimates of hybrid combinations showed that two hybrid combinations L591 x HD138, L591 x HD139 had highly heterosis for yield and fiber quality traits. Results also indicated that identification and selection of best F1 hybrids should not be only based on GCA and SCA, but also based on heterosis estimates of hybrid combinations.