试验选用地方常用自交系甸骨11A、红玉米、长3、Mo17(未改良自交系)和导入热带玉米种质选育的8份自交系(改良自交系)，每份改良自交系分别选定2个测验种，配制16个杂交种(改良杂交种)，未改良系与选定2个测验种组配的杂交种(未改良杂交种)作为改良杂交种的相邻对照，对比法设计。改良自交系和未改良自交系、改良杂交种和未改良杂交种的性状观测值作为一对数据，按成对资料统计方法分析，t测验。结果表明：甸骨11A导入Suwan1、5-56的改良自交系与红玉米杂种优势较高，红玉米导入Suwan1、EVT5的改良自交系与甸骨11A杂种优势较高，长3导入Suwan1、墨黄9的改良自交系与海014的杂种优势较高。改良自交系主要性状变化表现为生育时期延后、单株产量增加。未改良自交系熟期越早，改良自交系及改良杂交种生育时期延后时间越长，改良自交系单株产量增加幅度越大。改良自交系及其改良杂交种的玉米大斑病、茎腐病的抗性有了较大提高。

Eight inbred lines were selected by introducing tropic maize germplasm into Diangu11A, Hongyumi, Chang3, Mo17, 2 test varieties were selected for each inbred line. Contrast design, three replications. The observed values of agronomic traits of selected lines with tropic and subtropics germplasm and unimproved lines, hybrids of the selected inbred lines and the cross combinations of unimproved lines were taken as a pair of data and analyzed by pairing statistical method, t test. The results showed that the heterosis of hybrids crossed by Diangu11A induced Suwan1, 5-56 and Hongyumi, Hongyumi induced Suwan1, EVT5 and Diangu11A, Chang3 induced Suwan1, Mohuang9 and Hai014 were all higher than the adjacent control groups. The main agronomic traits change of inbred lines induced into tropical germplasm was the delay of growth period. The earlier mature period of induced inbred lines, the longer growth period of relevant new selected inbred lines and crossed hybrids. All the plant yield of tropic germplasm introduced inbred lines get improved. The earlier mature period of induced inbred lines, the higher increase yield range of tropic germplasm introduced inbred lines than unimproved lines. The northern leaf blight and stalk rot resistance of tropic germplasm introduced inbred lines and crossed hybrids had improved widely while the pathogenesis degree of head smut showed difference.

国家科技支撑计划“高产优质多抗玉米育种技术研究及新品种培育”(2006BAD01A03)、国家863计划“强优势杂交种的创新与应用”(2009AA101103)