Abstract
Aim. Vernalization response and photosensitivity were evaluated in some new cultivars originating from West European countries. Methods. Vrd and Ppd-1gene effects were measured by comparing numbers of days to heading at planting in natural and 10-hours photoperiods after preliminary green seedling vernalization of various duration. Those genes inheritance was studied under environment combinations securing the division of their effects. Results. Studied gene effects were inherited as partially dominant with additive-epistatic interactions. Evaluated stocks characterized often by durable vernalization requirement and photosensitivity presence differing essentially from modern Ukrainian cultivars. Conclusions. We call in question the assertion of leading Ukrainian breeders that strong physiological reactions of initial development delay are the factors limiting the modern productivity level in winter bread wheat.
 Keywords: winter bread wheat, heading dates, vernalization requirement, photosensitivity, modern cultivars, productivity.
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