New red flower germplasm lines of cotton selected from hybrid ofGossypium hirsutum XG. bickii.
By means of dropping GA(3)(50 ppm) and NAA (40 ppm) on the hybrid boll-embryo culturein vitro, one F(1) plant ofG. hirsutum x G. bickii was obtained; when F(1) branches were grafted on upland cotton and then back-crossed with upland cotton under short-day and cooler-night condition, some BC(1) seeds could be harvested. The characteristic segregation was very violent in early generation. Through 3 times of back-crossing and selecting, ten stable hybrid lines with the character of both male parent (viz. red petal-purple spot and strong fibre) and female parent (plant type, earliness, white fibre, lint length, etc.) were established. These lines were assigned as HB red flower lines (HBRL). Transference of character ofG. bickii to upland cotton was proved to be successful for the first time. These new germplasms may play an important role in both the genetic research and new cotton variety breeding.
Liang
Z
Z
Institute of Genetics, Chinese Academy of Sciences, 100101, Beijing, China.
Jiang
R
R
Zhong
W
W