Analysis on the Heterosis and Combining Ability between Marked Breeding Lines with Open-bud in Upland Parents

Fifteen F1 and F2 were used between five marked breeding lines with open-bud parents and three upland parents to analyze high parent heterosis, mid-parent heterosis and useful heterosis, and combining ability effects for 11 characters. The result showed that the heterosis for yield and fiber properties were obvious for the prefrost lint cotton yield, the range of high parent heterosis were -28.88%13.17% with average value -3.06%, 6 crosses have positive heterosis, the range of mid-parent heterosis were 18.14%80.12%, with average value 53.08%. 15 crosses have positive heterosis,the range of useful heterosis were -15.32%46.43% with average value 11.27%, and 10 crosses have positive heterosis. Of the combining ability , CCRI 19 and Shi 321 of the females, 96-1, 96-67 and 96-33 of the males were good perants for most of characters, A1B2, A2B2, and A4B1 were good crosses for most of SCA.