| 【Objective】During the creation of sweet potato breeding in 2020, from the selected seedlings to the
reselection test, the upgraded fresh-eating strains were selected to participate in the field variety comparison test so as
to provide diversified special varieties for provincial and national（southern）regional trials, production demonstration,
development and utilization.【Method】Select the 50 test strains upgraded from the selection test were selected and
comparison test was conducted based on three categories: anthocyanin（purple）, carotene and high-quality starch. In
each category, the strains were arranged according to random blocks and repeated three times. During the harvest period,
the basic characteristics of stems, leaves and roots were observed and identified, the root setting ability was recorded, the yield of fresh roots, the dry matter rate of roots, the contents of fresh root starch, carotene and anthocyanin were measured,
and the taste of steamed roots was evaluated.【Result】In the carotene category, two lines were selected and upgraded, of
which Guangshu 18-10 belonged to the type with multi-roots, high quality and high yield, and Guangshu 18-62 belonged to
the type with short vine and ultra-high carotene. In the high-quality starch category, four lines were selected and upgraded,
Guangshu 18-28, Guangshu 18-114, Guangshu 18-126 and Guangshu 18-111 belonged to four types: good root setting,
high yield, high starch content and purple stems and leaves. Three other strains（17-111, 18-91 and 18-127）were
conserved in the resource nursery and used as high-quality materials. Six lines were selected from the anthocyanin sweet
potato lines, including Guangshu 18-70, Guangshu 18-82, Guangshu 18-79, Guangshu 18-46, Guangshu 17-156 and
Guangshu 18-57, which belonged to six types: beautiful root, excellent taste, anthocyanin specific, high yield, super high
starch content and stem and leaf vegetables, and another four lines（17-175, 18-40, 18-88, 18-106）were introduced into
the resource nursery for conservation and used as high-quality purple sweet potato materials.【Conclusion】Therefore, the
field variety comparison and identification test provides rich special variety types of sweet potato for further variety breeding,
identification, development, production demonstration and utilization. |
