甘薯品种抗黑斑病鉴定及其遗传趋势

对2745份甘薯品种及育种材料的黑斑病抗性鉴定结果表明，高抗型占7．7％，抗病型占17．7％，中抗型占23.2％，感病型占27．2％，高感型占24．2％。对898份材料及其亲本的抗性分析表明，不同抗性组合后代中均可分离出高抗至高感类型的材料，杂交后代的抗性强弱随双亲抗性水平的增加而提高。相关分析显示，甘薯品种抗黑斑病性与其它主要经济性状间没有相关关系。采用品种阃杂交育种技术先后育成了一批高产、优质的抗病型优良品种。

Identification of Sweetpotato Varieties for Resistance to Black Rot and Inheritance of the Resistance

Totally 2745 sweetpotato accessions were identified for resistance to black rot from 1984 to 2002. Results demonstrated that about 7.7% of varieties or lines were highly resistant, 17.7% resistant, 23.2% medium resistant, 27.2% susceptible and 24.3% highly susceptible. The analyses of the resistance of 898 lines showed that resistant plants could be obtained from the progeny of any parental combinations. However, the higher parental resistance was, the more percentage of resistant plants in their progeny was. Results of correlation analysis indicated that there was not any correlation between resistance to black rot of varieties and its main economic characters. A lot of improved varieties of resistance to black rot with high yield and good qualities have been developed.