关键词: 马铃薯, 彩色, 有性杂交, 系统选育

Abstract: ‘Xigezi 2’is a new fresh eating colored potato cultivar. It was developed through sexual hybridization and systematic selection，with‘Heijingang’as the female parent and the collected resource ‘S50’as the male parent. It is a medium-late-maturing variety，with a growth period of about 95 days. The plant height is around 52.1 cm，the plant type is spreading，and the number of branches is moderate. The tuber shape is long-ovoid. The tuber skin is rose-red，and the tuber flesh is pink. The tubers are uniform，without secondary growth，and the bud eyes are of medium size. The dry matter content of the tubers is 22.2%，the starch content is 16%，the protein content is 5.74%，the reducing sugar content is 0.37%，and the vitamin C content is 34.7 mg · g^-1. It is resistant to PVX virus disease and moderately resistant to PVY virus disease. The average yield is 28 500 kg · hm^-2. It is suitable for planting in the river-valley agricultural areas of Tibet at an altitude of 2 600–4 200 m.

Key words: potato, colored, sexual hybridization, systematic selection