F1-F 4 cotton hybrids obtained with introgressive cotton lines

Research Institute of Cotton Breeding, Seed Production and Agrotechnologies Research Institute, Tashkent, 111218, Uzbekistan

^* Corresponding author: namazov-05@mail.ru

Abstract

The article presents cytogenetic analyzes of introgressive lines obtained by intergenome crossing and F1 - F4 cotton hybrids obtained with their participation. According to the obtained results, the presence of open bivalents and univalents in MKP in the crossed variants of F1 - F4 hybrid plants obtained from introgressive lines showed the absence of complete conjugation in the chromosomes due to the presence of structural differences between the homologous chromosomes in the crossed forms caused by the exchange of chromosomes with foreign chromosomes . According to the results of the tetrad analysis of the studied F 1 hybrids, the average was from 95.65 % (F1T-158/16 x Sultan) to 99.61% (F1T-4747-48/16 x Sultan), tetrads in F2 hybrid plants according to the results of the analysis, the meiotic index in 16 combinations ranged from 96.76 ± 0.34 to 99.54 ± 0.19 , and according to the results of the tetrad analysis in F 3 hybrid plants, the meiotic index in 16 combinations was 96.51 ± 0.56 to 99.34 ± 0.30 and according to the results of the analysis of tetrads in F4 hybrid plants, the meiotic index in 17 combinations was from 97.14 ± 0.29 to 98.92 ± 0.12, confirming the normal course of meiosis. (monod, dyad, triad, pentad, hexad and polyad) led to an increase in the number of This negatively affects the formation of normal gametes.