利用杂种优势是棉花增产的重要途径之一,但由于配制杂交种有很多困难,致使“杂交棉花”至今未能真正大面积应用。1982年,从北京农大引入了以“出苗稍晚、前期发育较迟”为标记,由一对隐性核基因控制的棉花雄性不育系81A,发现其中216可育自交株系在3—5片真叶时叶色有黄、绿之别,且黄色与雄性不育 The use of heterosis is one of the important ways to increase yield of cotton, but due to the difficulties in formulating hybrids, “hybrid cotton” has not been applied in large area so far. In 1982, the male sterile line 81A, which was controlled by a pair of recessive nuclear genes, was introduced from Beijing Agricultural University with “late emergence and early development” as the marker. It was found that 216 male sterile lines were 3-5 true leaf leaves when the color yellow, green, and yellow and male sterile