Bazı Elma Çeşitlerinin Çiçek Tomurcuklarının Farklı Safhalarında İlkbahar Geç Donuna Dayanıklılığı

Bu çalışmada, meyve bahçesinde 17 Nisan 2004 sabahı 3:00-8:00 saatleri arasında meydana gelen ve sıcaklığın –4 ile –6 oC’e düştüğü dondan sonra 7 elma Malus x domestica Borkh. çeşidinin açılmamış tomurcuk safhasından çiçek safhasına kadar farklı gelişme safhalarındaki çiçek tomurcuklarında dişi organların canlılık oranları belirlenmiştir. Dondan sonra dişi organlardaki canlılık oranları, açılmamış tomurcuklarda % 36.7 ve 96.5, pembe ucun göründüğü tomurcuklarda % 6.2 ve 86. 0, pembe tomurcuklarda ise % 0.2 ve 52.0 arasında değişmiştir. Açılmamış tomurcuk safhasından çiçek safhasına kadar farklı gelişme safhalarındaki çiçek tomurcuklarında ‘Starkspur Golden Delicious’ % 18.0 , ‘Granny Smith’ % 33.0 ve ‘Canada Reinette’ % 36.7 dondan sora en az zarar gören çeşitler olmuştur

Anahtar Kelimeler:

Elma, Malus x domestica borkh., ilkbahar geç donları

The Late Spring Frost Hardiness of Some Apple Varieties at Various Stages of Flower Buds

In this study, survival rates of pistils of seven apple Malus x domestica Borkh. varieties at various stages from tight cluster to full bloom on trees were determined after frost that occurred on the morning at 3:00-8:00 of April 17, 2004when the temperature dropped to –4 to –6 oC in the orchard. The survival rates of pistils of varieties ranged between 36.7 and 96.5% at tight cluster, 6.2 and 86.0 % at first pink and, 0.2 and 52.0 % at full pink stages after frost injury. ‘Starkspur Golden Delicious’ 18.0 % , ‘Granny Smith’ 33.0 % and ‘Canada Reinette’ 36.7 % were the least damaged apple varieties at various flower buds stages from tight cluster to first bloom on trees after frost

Keywords:

Apple, Malus x domestica borkh., late spring frost,

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