Genetic analysis of frost hardiness traits in tuber-bearingSolanum species |
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Authors: | Roberto Valverde Tony H H Chen |
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Institution: | (1) Department of Horticulture, ALS 4017, Oregon State University, 97331 Corvallis, OR, USA;(2) Centra de Investigaciones, Agronomicas, Universidad de Costa Rica, San Jose, Costa Rica |
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Abstract: | The inheritance of frost hardiness and cold acclimation potential traits was studied in three segregating populations derived
from a cross betweenSolanum commersonii Dun. PI 243503 (cmm) andSolanum cardiophyllum Lindl., PI 184762 (cph), two parental genotypes with contrasting frost hardiness and cold acclimation potential. The levels of frost hardiness and
cold acclimation potential were expressed as the LT50, the temperature at which 50% of the cells in leaf discs were killed, as measured by the ion leakage method, following a
controlled freeze test There was considerable variation in both frost hardiness and cold acclimation potential in all three
segregating populations (F1 F1 xcmm, and F1 xcph). Frost hardiness and cold acclimation potential were not correlated, suggesting that these two traits are under independent
genetic control. The analysis of generation means indicated that the variation for both traits could be best explained by
an additive-dominance model, with additive gene effects the most important Broad-sense heritability was 0.73 and 0.74 in the
F1 population, for frost hardiness and cold acclimation potential, respectively, and was 0.85 for either trait in the F1 xcmm population, indicating that these two traits are highly inheritable. Our results suggest that it should be possible to incorporate
the frost hardiness and cold acclimation traits from S.commersonii into cultivated potato species. |
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Keywords: | Frost injury generation mean analysis heritability potato |
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