Effects of the dominant glandless gene Gl(2)(e) on agronomic and fibre characters of Upland cotton

Seven pairs of near-isogenic lines (glandless vs. glanded) and the recurren t parents were used to determine the effects of the dominant glandless gene from 'Hai 1' (Gossypium barbadense) on agronomic, fibre, and seed characte rs in Upland cotton, Gossypium hirsutum, backgrounds. The results showed th at there were no apparent linkage associations of the glandless gene on mos t agronomic, fibre and seed characters of Upland cotton, except for seed qu ality. The glandless line derived from 'Liaomian 7' had significantly more protein (489.6 g/kg), and that from H237 had significantly more oil (362.4 g/kg) and had the largest oil index (2.70 g) and protein index (3.03 g). Th e gossypol content of seed in dominant glandless lines in Upland cotton was very low (<0.04 g/kg). Therefore, it is suggested that the glandless gene can play an important role in breeding glandless or low seed-gossypol Uplan d cotton cultivars.