Two Kinds of Starch Type Sweet Potatoes: Differential Analysis of the Growth and Development Rule and Yield & Quality

doi:10.11923/j.issn.2095-4050.cjas18050029

Abstract

Abstract: To meet the market need for high yield and good quality sweet potato cultivars and accelerate the breeding and popularization of a new line ‘Taishu 15’ of starch type sweet potato, in this experiment, ‘Jishu 25’ was used as a control to analyze the changes of biological characteristics at different developmental stages, yield and quality of ‘Taishu 15’. The results shown, on the biological characteristics, the length of vine and stem diameter of the two cultivars (lines) shown a continuous increase trend after planting 40-100 d, and the stem diameter of ‘Taishu 15’ was obviously greater than that of ‘Jishu 25’. The fresh weight of stem and leaf per plant, the leaf area per plant both shown a trend of first increased and then decreased, and reached the peak value at 80 d after planting. The potato fresh weight per plant and single potato weight increased continuously after planting, which the potato fresh weight per plant of ‘Taishu 15’ was significantly greater than that of ‘Jishu 25’. The T/R value continued to decrease after planting, while the storage root thickening rate reached the maximum of 80-100 d after planting. On yield and quality, the fresh potato yield and total soluble sugar content of ‘Taishu 15’ were all significantly higher than that of ‘Jishu 25’, which the fresh potato yield reached 38951.40 kg/hm2 and increased yield by 17.76%, the total soluble sugar content was 74.07 mg?g-1?DW. The difference of dry rate and starch content between two cultivars (lines) was relatively small, which the dry rate and starch content of ‘Taishu 15’ was 29.37% and 756.07 mg?g-1?DW respectively. The comprehensive performance of ‘Taishu 15’ was better.

CLC Number:

S531

References

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