玉米引入热带种质对倒伏性的影响

选用一批热带、亚热带玉米育种材料与沈阳地区常用自交系5003、Mo17^Ht和丹340等进行杂交再回交，将其后代进行测交．结果表明：不是所有的热带、亚热带种质都能改善自交系的倒伏性：来源不同的热带、亚热带种质对改善自交系倒伏性效果不同；同一组合内由于热带血缘所占比例不同，倒伏率的改良效果不同；同一热带、亚热带种质对不同自交系的改良效果不同，就本试验而言，对亚热带地区种质改良Reid血缘种质较好，低纬度地区种质改良旅大红骨类群自交系为宜。

Effect of Introducing Tropical Germplasm on Maize Lodging Resistance

A group of tropical and subtropical breeding materials were crossed with inbred lines 5003,Mo17(Ht) and Dan 340 in Shenyang region,then backcrossed, The results indicated that: Not all the tropieas and subtropical germplasm can improve loging ratio of inbred lines. The tropical and subtropical germplasm of different sources differed from effect to improve lodging ratio of inbred lines. In the same combination, the tropical kin accounted for different proportion, the improved effect of lodging ratio was different. The ideutical tropical and subtropical germplasm was improved with different effect to the different inbred line, subtropical germplasm can improve Reid loging ratio, tropieas can improve Lvdahonggu loging ratio.