Genetic variability for tuber dormancy and associated traits in potato (Solanum tuberosum L.)
1998
Md Harun-Or Rashid
Analyses of variance indicated that there was high genetic variability for each of the traits of consideration. Genetic analysis showed that tuber dormancy was predominantly controlled by additive gene effects although significant amounts of nonadditive effects were present. For seedling emergence and sprout weight, both additive and dominance effects were also significant, with the former being predominant. Only nonadditive type of gene effects were predominant for tuber size and tuber yield, while only additive effects were predominant for tuber dry matter content and weight loss due to respiration. There were no significant maternal effects for most of the traits. Triphenyl tetrazolium chloride (TTC) tests were found to give an indication of tuber dormancy, but the continuous variation in staining may confuse in making any conclusive decision. Tuber dormancy was found to be positively genetically correlated with seed dormancy and dry matter content, and negatively correlated with sprout weight, weight loss and TTC color index indicating that selection for long tuber dormancy should be accompanied by selection for long seed dormancy and high tuber dry matter content, and supplemented with TTC tests for maximum selection efficiency. In view of the results, recurrent selection breeding along with indirect selection of related traits would be the best method for genetic improvement of tuber dormancy and dry matter content of potato. For the two other traits studied, namely, tuber size and tuber yield, reciprocal recurrent selection or biparental crosses followed by clonal selection may be more appropriate
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