Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (18): 44-51.doi: 10.11924/j.issn.1000-6850.casb2021-0837

Special Issue: 生物技术 马铃薯

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New Purple-flesh Sweetpotato Variety ‘Ningzishu 6’ with High Yield and Good Quality: Breeding and Breeding Strategy

JIA Zhaodong(), MA Peiyong, BIAN Xiaofeng, YU Yang, ZHANG Qian, LIU Shuai, XIE Yizhi()   

  1. Institute of Food Crops, Jiangsu Academy of Agricultural Sciences, Nanjing 210014
  • Received:2021-08-31 Revised:2021-12-05 Online:2022-06-25 Published:2022-07-14
  • Contact: XIE Yizhi E-mail:jzdgood162@126.com;xyz@jaas.ac.cn

Abstract:

The objectives of the study are to breed new varieties of purple-flesh sweetpotato with high yield and good quality. ‘Sushu 8’ was used as female parent and ‘Yuzishu 7’ was the male parent, and sexual hybridization was conducted. The new purple-flesh sweetpotato variety ‘Ningzishu 6’ was bred by screening technology of multi-environment alternative directional selection and high-low generation combination selection. The results showed that ‘Ningzishu 6’ obtained the favorable traits of the hybrid parents, the average yield of fresh root of ‘Ningzishu 6’ was 40100.40 kg/hm2, which was 21.09% higher than that of ‘Ningzishu 1’ (CK). The average dry matter rate was 29.36%. The test score of cooked taste was 77.8, which was 7.8 points higher than that of CK. The content of anthocyanin was 17.68 mg/100gFW, and the rate of large and medium-sized tuberous root was 84.7%. ‘Ningzishu 6’ was resistant to root black rot and moderately resistant to stem nematode. In summary, the new variety‘Ningzishu 6’ has high and stable yield, good taste, and good comprehensive resistance. ‘Ningzishu 6’ passed the national variety registration in 2019. As a new purple-flesh variety for fresh-eating or processing, it is suitable for application and cultivation in the Yangtze River Basin and surrounding areas. Based on the discussion of breeding strategies, the authors believe that heterosis prediction and efficient utilization of core parent materials will significantly improve the breeding efficiency, and the application of the ‘participatory breeding model’ will accelerate the commercial application of new varieties.

Key words: purple-flesh sweetpotato, ‘Ningzishu 6’, variety breeding, core parent, breeding strategy

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