Genetic analysis of dry matter and reducing sugar content in potato (Solanum tuberosum L.).
1993
Jiaseio Zhan
The strong environmental effect was demonstrated by the observation that clones grown in the highlands had higher dry matter and reducing sugar contents than those grown in the lowlands. Both additive and dominance gene action influenced the dry matter content in potato tubers. Additive gene action, however, predominated over the dominance gene action. The average degree of dominance for dry matter content was in the overdominance range. The additive and dominance gene actions contributed 83.30% and 16.70%, respectively, of the total genetic variance in reducing sugar content. The average degree of dominance for reducing sugar content was in the partial dominance range. Broad sense heritability for dry matter content was quite high, but narrow sense heritability was low. Both broad and narrow sense heritabilities were low for reducing sugar content. High dry matter and reducing sugar contents were often associated with wide leaf, wide terminal leaflet, short plant, deep tuber color and late maturing varieties. However, the genotypic correlation of maturity with dry matter content was very weak. Early maturing varieties with high dry matter content could be selected by breaking the loose linkages. Stem number, stem diameter, tuber size and tuber weight were also stongly correlated with dry matter and reducing sugar contents, but the correlation was highly affected by the environment. The correlation of dry matter content with reducing sugar content was positive, significant and less influenced by the environment.
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