关键词: 肌苷, 肌苷, 绿豆, 种子萌发, 幼苗生长

Abstract: To summarize and explore the theory and practice of the breeding methods of starch sweetpotato varieties, and accelerate the breeding process of breakthrough varieties, the authors conducted statistical analysis on variety characteristics of 16 varieties in Sushu starch-type sweetpotato series, which were bred in 2000-2016. The main agronomic and economic traits of these varieties were analyzed. The results showed that: the yield of these sweetpotato varieties steadily increased, and the disease resistance increased gradually. However, the starch content of varieties needed to be further improved. In the pedigree analysis, these varieties were mostly family lineage of Nancy Hall and Okinawa No.100, so these varieties had low levels of genetic diversity, and the genetic basis was narrow. The paper pointed out that, the dual-purpose starch varieties which had medium dry matter content and high yield, were more popular than special purpose varieties in the market. Trait analysis results showed that the length of the longest vine tended to shorten, about 160 cm; the stem diameter changed greatly, and the change varied among different varieties; the number of base branches had a large improvement space. Therefore, innovation and screening of germplasm resources should put starch content as one of the breeding targets, based on short vine (less than 150 cm), multi-branched (more than 10). We should focus more on the collection of germplasm resources with high starch content, and increase starch content of starch-type sweetpotato varieties to 25%.