Abstract:

The experiment aims at breeding a new sweet potato variety which is rich in carotene, early-maturity, fresh-eating and high-quality. The female parent, ‘Longshu 9’ with early maturity, high yield and wide adaptability, and the male parent, the mixed pollen from 18 domestic and foreign fine varieties including ‘Jinganshu 9’, ‘Jishu 25’, ‘Huangjinqianguan’ and so on, were selected for mass cross. After seeding and selecting the lines, a reselection test, a comparison test, and a regional test in Shanxi were conducted to evaluate the adaptability and the disease resistance identification. The new sweet potato ‘Yunshu 9801’ was bred. In provincial multi-location adaptability test, the average yield of fresh storage root was 48528.15 kg/hm², which was 13.18% higher than that of the control variety ‘Jinganshu 9’. The dry matter and starch content of the root were 25.5% and 19%, respectively. The carotene content of fresh root was 4.41 mg/100g. The steamed root was sweet with good taste, which taste value was 88.7 scores. ‘Yunshu 9801’ was resistant to bacterial wilt, medium resistance to black rot and Fusarium bulbigenum. The special fresh-eating sweet potato variety ‘Yunshu 9801’ was characterized with high quality, high yield, wide adaptability, outstanding commodity value and good palatability, and conducive to promoting the production of sweet potato and improving the social and economic benefits of sweet potato cultivation. ‘Yunshu 9801’ was registered as a national non-major crop variety in 2020.

Key words: sweet potato, Yunshu 9801, variety breeding, fresh-eating, carotene, early maturity