Abstract:

To speed up the breeding process of new sweet potato cultivars with high quality and high starch yield, the high-quality starch type cultivar ‘Xicheng 007’ was selected as the female parent, and the seedling seeds were obtained by open pollination. In field, the candidate materials with stable yield were obtained through screening seedlings and the identification of high generation, then the southwest combined test and disease resistance test were conducted, and the new sweet potato cultivar with high quality and high starch yield was selected, which was named ‘Chuanshu231’. The morphological characteristics, flowering habit, yield, disease resistance, quality and superior characteristics of ‘Chuanshu231’ were studied. In 2017 and 2018 southwest combined tests, the average fresh weight yield of ‘Chuanshu231’ was 33.84 t/hm², the dry matter rate was 35.62%, dry yield of sweet potato was 11.87 t/hm², and the starch rate was 23.01%, all higher than those of the control ‘Xushu22’. In field, ‘Chuanshu231’ showed resistance to stem rot disease, moderate resistance to root rot and black spot diseases, and had the advantages of good germination and rapid growth of seedlings. In a word, ‘Chuanshu231’ is a new starch type cultivar with high quality and high yield. It has the characteristics of good germination and early growth dominance which can reduce the consumption of sweet potato tubers, prolong the growing period in field and increase economic benefits. The fast growth rate of ‘Chuanshu231’ in field is beneficial to enhancing stress resistance, so this cultivar has a large market potential, and can provide important breeding material for new starch type sweet potato cultivars with high quality and high yield. ‘Chuanshu231’ was registered as GPD Sweet Potato (2021)510016 through the registration application of non-major crop in 2021.

Key words: ‘Chuanshu231’, high quality, starch, stress resistance, growth vigor