中文摘要：

利用形态农艺性状标记对来自17个省份的176份中国甘薯地方种质资源进行遗传多样性分析,结果表明形态标记并未按照这些地方种质的来源地聚类,176份种质可以划分为5大类群,发现了复份保存的2对种质材料。对其中133份地方种质资源的品质特征进行比较和统计分析,筛选到高干物率、高淀粉种质11份,其中广东地方种质爆皮王的干物率和鲜薯淀粉含量最高,分别为34.87%和23.32%;鲜薯可溶性糖≥4.00%的材料11份,其中来自云南的腾冲本地种可溶性糖含量最高,为5.22%;筛选高蛋白材料2份。同时利用品质性状标记将133份地方种质划分为5大类群,第Ⅰ类群主要为干物率、淀粉含量和粗蛋白含量低,可溶性糖含量高的14份种质;第Ⅱ类群主要为可溶性糖含量较高、干物率和粗蛋白含量较低的28份种质;第Ⅲ类群由可溶性糖含量最高的腾冲本地种1份种质构成;第Ⅴ类群由干物率及鲜薯淀粉含量都很高的4份广东品种构成;剩余的86份种质组成第Ⅳ类群,各项表现不等。通过对我国甘薯地方种质资源遗传多样性的探索,为甘薯育种选配亲本提供参考,同时促进我国甘薯种质资源研究利用和种质创新。

英文摘要：

Genetic diversity of 176 sweetpotato landraces from 17 provinces in China was analyzed using mor- phological traits. The accessions from the same origins were clustered into different groups, indicating that there was no direct relationship between genetic diversity and geographical origins. 176 landraces could be divided into five groups by UPGMA cluster based on euclidean distance. And two pairs of duplicate accessions were found. The qual- ity characters of 133 landraces were identified. 11 accessions with high dry matter content and high starch content were screened,in which Baopiwang from Guangdong was the highest one with 34. 87% dry matter content and 23.32% starch content of fresh sweetpotato respectively. The 11 landraces with soluble sugar content of fresh sweet- potato〉~4. 00% were screened, of which a landrace Tengchongbendizhong from Yunnan was the highest with the content of 5.22%. And 2 landraces were screened with high raw protein content. The 133 landraces were clustered into five groups based on quality traits. The group I was mainly composed with the landraces with low starch and protein content, high soluble sugar content. The group 11 included 28 landraces with high soluble sugar content, low dry matter and raw protein content. There was only 1 accession with the highest soluble sugar content in the group m. The group V included 4 landraces from Guangdong with high starch content. The rest of the 86 landraces constituted the group 1Vand the quality traits of these accessions had no obvious regularity. The genetic diversity analysis of sweetpotato landraces germplasm could provide reference for selecting parents in sweetpotato breeding and promote utilization and innovation of sweetpotato industry in China.