INHERITANCE AND MANIFESTATION OF WINTER RESISTNCE FEATURES BY PEAR HYBRIDS IN CONDITIONS OF NON-BLACK EARTH REGION
Research results on defining optimum combinations of crossing pear varieties and hybrids are presented in this article for the purpose of acquiring winter-resistant posterity. Studied hybrids had a certain level of stability to temperature mode influences of second and fourth components of winter resistance. The level of hybrid winter resistance was established by means of damaging studied samples by artificial freezing. Studied samples were frozen at temperature modes of second (-380C) and fourth (-320C, after thaw influence of + 50C) winter resistance components. Winter resistant levels of the hybrids were established by means of damaging the studied samples by artificial freezing. Damage levels of frozen buds, terminal buds, bark and wood samples were carried out.. The received results were compared with the level of winter resistance of initial forms. On this basis, the amount of genotypes in hybrid families possessing equal or surpassing level of winter resistance in comparison with parental samples was calculated.