Abstract: Abstract: 【Objective】Accumulation law of anthocyanin in developing root and the relationship between the law and major economic traits in purple-fleshed sweetpotato ( Ipomoea Batatas (L.) Lam ) were studied in present paper. 【Method】The dynamics of 20 kinds of economic traits in 13 purple-fleshed sweetpotato varieties at 20d, 40d, 60d, 80d, 100d, 120d and140d after their transplanting were investigated, these traits included anthocyanin content in root, length of the longest stem, number of base branches, root number, dry matter contents in stem, foliage and root, fresh and dry yields of root, fresh and dry yields of stem, fresh and dry yields of foliage, fresh and dry yields of vine, fresh and dry yields of whole plant, and rations of photosynthate to root, to stem and to foliage. The correlationships of anthocyanin content with other 19 economic traits in varieties and whole developmental stages were analyzed. So as the correlationships of daily growth rate of anthocyanin content with other daily growth rates of 10 kinds of yields. 【Result】 (1) There were three types of anthocyanin accumulation in these purple-fleshed sweetpotatoes, that is slowly increasing, fluctuating and devious ascending. (2) Anthocyanin content had significant negatively correlationships with the number of base branches, fresh and dry yields of root, ration of photosynthate to root，and had significant positive correlationships with dry matter content of root, length of the longest stem, fresh and dry yields of stem,, dry yield of whole plant and ration of photosynthate to foliage, and had no significant correlationships with other economic traits among purple-fleshed sweetpotato varieties. (3) Purple-fleshed sweetpotatoes belonging to different types of anthocyanin accumulation had different responses to the growth of length of the longest stem, number of base branches, fresh and dry yields of root and photosynthate allotments, and had no responses to the growth of other economic traits during whole developmental stages. (4) Because of the significant negative correlationship between daily growth rates of anthocyanin content and dry matter yield of root, the anthocyanin accumulation competed with dry matter accumulation for photosynthate in root, and the competitive relation was resolved in different way in different purple-fleshed sweet potato varieties.【Conclusion】The three types of anthocyanin accumulation in purple-fleshed sweetpotato can be demonstrated by the their different responses to the growth of economic traits , the competitive relations in accumulations of anthocyanin and dry matter in root, and their different settling ways of these competitive relations. The anthocyanin accumulation characteristics will give scientific proofs for the further research, breeding, cultivation and industrialization of purple-fleshed sweetpotato.

Key words: Purple-fleshed sweetpotato, Anthocyanin, Anthocyanin accumulation, Economic trait, Correlationship