Evidence of a major genetic factor conditioning freezing sensitivity in winter wheat
2008
The inheritance of freezing tolerance in F₂-derived F₄ populations from all possible crosses of winter wheat cultivars 'Kestrel', 'Eltan', 'Tiber', 'Froid' and germplasm line Oregon Feed Wheat #5 (ORFW) was investigated. When frozen to a temperature equal to the LT₅₀ of the least freezing tolerant parent (ORFW), survival frequency distributions were skewed to greater survival in six of the 10 crosses, however, very few of the progeny from the four crosses to ORFW survived. The inheritance of this freezing sensitivity was investigated with freezing of F₂:₄ populations from the crosses of ORFW to 'Eltan' or 'Tiber' to the LT₅₀ of the hardier parent. Very few of the F₂:₄ populations survived as well as 'Eltan' or 'Tiber', indicating a small number of strongly dominant genetic factors in ORFW that conditioned freezing sensitivity. Molecular analysis indicated these factors were not spring-type vernalization alleles.
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