Hardness exhibited an extremely significant positive correlation with dry matter content and starch content ( r = 0.6424 and 0.6420, respectively), and showed no significant correlation with main aboveground morphologic traits (stem diameter, number of basal branches, maximum vine length).
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Genetic diversity evaluation and selection methods of sweet potato hybrid F<sub>1</sub> population based on SSR markers and phenotypic detection.
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Starch yield per plant exhibited highly significant positive correlations with main aboveground morphologic traits (stem diameter, number of basal branches, maximum vine length), fresh yield and the number of large and medium storage roots per plant ( r = 0.2978, 0.2866, 0.2963, 0.9353, and 0.7174, respectively), and it showed no significant correlation with fresh yield and number of small storage roots per plant, or starch content.