双低杂交油菜油研七号的选育研究Ⅲ亲本资源的选择及其杂种的适应性分析

双低杂交油菜油研七号亲本资源分别来源于长江上游和中游（其中又具有欧洲品种材料的血缘）不同的生态类型，并具有在全国适应性最广、推广面积最大的中油821的血缘，在贵州的生态条件下育成，其遗传基础丰富，通过近4年在整个长江流域的推广实践表现适应性好：其抗病性、耐肥抗倒性与中油821接近，优于其它品种；苗期抗寒耐冻力较强，花期耐低温能力优于中油821和秦油二号等品种；生育期适中，能适应全流域不同海拔不同纬度各种耕作制度的栽培；全流域154个试点的统计资料显示增产点在90％以上，比现有的中油821、秦油二号等推广品种平均增产9.8%。

Selection of Parental Resources and Adaptability Analysis of its Hybrid

Youyan 7,with the plentiful genetic foundation including different ecological types of upper and middle reaches of Changjiang river with the consanguinity of European rape varieties and Zhongyou 821,was bred under the ecological condition of Guizhou.Youyan 7 has the better adaptability,strong disease resistance and resistance to lodging,better cold resistance in seedling stage and flowering stage which are close to or better than those of Zhongyou 821 and Qinyou 2,and its growing period is suited to the different cropping systems,latitudes and elevations of the whole catchment area.The slatictics data show that the average yield of over 90% of 154 test plots increased by 9.8% higher than yields of Zhongyou 821 and Qinyou 2.