In this study,36 crosses were made with four tropical,subtropical maize inbred lines as test-crossed and nine temperate inbred lines as tested ones by NCII genetic design,and were evaluated in Kunming,Qujing and Dehong of Yunnan province.General combining ability(GCA),Special combining ability(SCA) and genetic parameters of nine agronomic traits of these inbred lines and crosses were recorded.The results showed that the CRN3760-1-2-2-1-1-2 (tropical maize inbred line) has the highest yield GCA,next were YML46,[A1112 × T(5003 × Yun146)] ##-1-1-1-1-B,2870263-4-2-1-B-B-B-B-B,IRF321,8723 and 23X,and they were had significant at P ≤0.05.Above inbred lines could be used in developing the crosses with higher heterosis.Four cross combinations with having significant higher yield SCA and high yield potential were selected,which were CRN3760-1-2-2-1-1-2 ×23X,CRN3760-1-2-2-1-1-2 × 2870263-4-2-1-B-B-B-B-B,CRN3760-1-2-2-1-1-2 × [E1112 ×T(5003 ×Yun146)]##-1-1-1-1-B and YML46 × 8723,and their performance of high yield and yield stability would be further tested in Yunnan.The hereditary of the nine agronomic traits were mainly under control by the additive gene effect.The narrow heredity of axis diameter,100-kernel weight and grain rate were higher than 55.2 ％,which showed that the variation of these traits were affected mainly by hereditary,and they should be selected at early generation.The narrow heredity of ear diameter,sterile length and row number were lower than 23.2 ％,and they should be selected at the late generation.%以4个优良热带、亚热带玉米自交系为测验种,9个优良温带玉米自交系为被测系,按NCⅡ遗传交配设计配制36个杂交组合,在云南省昆明、曲靖和德宏3个不同生态条件下进行田间鉴评,研究其9个性状的配合力及遗传参数.结果表明:热带自交系CRN3760-1-2-2-1-1-2的产量GCA效应值最高,其次是YML46、[阿1112×T(5003×云146)]##-1-1-1-1-B、2870263-4-2-1-B-B-B-B-B、IRF321、8723、23X等自交系,都具有显著的产量GCA正效应值,是组配强优势杂交组合的优良自交系.杂交组合CRN3760-1-2-2-1-1-2×23X、CRN3760-1-2-2-1-1-2×2870263-4-2-1-B-B-B-B-B、CRN3760-1-2-2-1-1-2×[阿1112×T(5003×云146)]##-1-1-1-1-B和YML46×8723具有显著的产量SCA效应值,有一定的增产潜力,可作为潜势组合在云南进一步鉴定其丰产性和稳定性.9个性状的遗传以加性基因效应为主,轴粗、百粒重和出籽率的狭义遗传力都大于55.2％,其变异由遗传引起的比重较大,宜在早代进行选择,穗粗、秃尖和穗行数的狭义遗传力低于23.2％,宜在晚代选择.
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