马铃薯品种抗旱性评价及遗传多样性分析.

Potato is an important food crop, and sensitive to water. With global warming, drought damage to agriculture is increasing. In order to enrich new varieties of potato resistant to drought in Inner Mongolia Autonomous Region, the main agronomic characters, yield and quality characters related to drought resistance of 18 potato varieties were measured under the drought stress treatments. Principal component analysis was performed on 10 main traits, including the number of tubers per plant, mean tuber weight and number of large- and medium- sized tubers. The cumulative contribution rate of three principal components was 71.293% . According to the comprehensive score, 'Zhongshu 31', 'Huasong 7' and 'Huasong 56' were considered relatively drought- resistant. The genetic diversity of 18 potato varieties was analyzed using SSR molecular marker technology. Based on the genetic distance (GD) value of 0.66, 18 potato varieties were divided into four categories: 'Zhongshu 9', 'Zhongshu 28', 'Zhongshu 31', 'Neinongshu 2', 'Atlantic', 'Zhongshu 18' and 'Zhongshu 668' in category I; 'Zhongshu 27', 'Zhongshu 19', 'V7', 'Huasong 56', 'Xisen 6', 'Huasong 58', 'Neinongshu 1' and 'Huasong 34' in category II; 'Huasong 7' and 'Innovator' in category III; and 'Jizhangshu 12' in category IV. This study provides a basis for the utilization of potato germplasm resources and the selection of drought resistant breeding parents in the future. [ABSTRACT FROM AUTHOR]