[Evaluation of winter hardiness potential of new apple varieties and hybrids by artificial freezing]
2007
Yarmolich, S.A., National Academy of Sciences. Scientific and Practical Center for Potato, Vegetable and Fruit Growing (Belarus). Institute for Fruit Growing
The article presents results of the study of new apple varieties and hybrids for the main components of winter hardiness by applying the method of artificial freezing. The varieties Verbnoye, Witos, Imant, Syabryna, Yubilyar, the hybrids 85-14/95, 86-54/133, 86-56/29, 86-56/44 and 86-56/78 were selected for complex of indicators of high winter hardiness. These accessions are suitable initial material for further breeding. To the majority of allocated variety samples on two components of winter hardiness stability to sharp temperature drops during a thawing weather is characteristic, insufficient frost resistance of wood, a core and vascular-conducting bundle is noted at sharp decrease in temperature up to-40 deg C. In natural conditions at (-29.3 deg C) in January 2003 and at (-29.0 deg C) in January 2006 practically all investigated variety samples have shown high stability to cold stresses. They are capable to transmit in the tempered condition sharp temperature drop up to (-25 deg C) during thawing weather (+2 deg C). Thus damages of fabrics of annual branches and vegetative buds do not exceed 2,0 points. Allocated variety samples with high genetic potential stability on the main components of winter hardiness are the valuable selection material at selection of parental pairs for creation of varieties with the assigned parameters and for the state strain testing
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