The Genetic Effects of the Pigment Gland Genes of Upland Cotton (Gossypium. hirsutum L.)on the Glandless Seeds-Glanded Plant Trait from G. bickii Construction of IF2 Population and Its Application in Studies on Genetic Effects and Heterosis for Fiber Quality in Upland Cotton (G. hirsutum L.) Studies on the Inheritance of Flaring-Bract in Upland Cotton