Tunhan DEMİRCİ, Özlem ARAS AŞCI, Nilgün GÖKTÜRK BAYDAR, Zehra BABALIK

HASAT ÖNCESİ 24–EPİBRASSİNOLİD (24–eBL) UYGULAMALARININ ALPHONSE LAVALLÉE VE HOROZ KARASI ÜZÜM ÇEŞİTLERİNDE ALFA, BETA, GAMA, DELTA TOKOFEROL BİRİKİMLERİ ÜZERİNE ETKİLERİ

Sofralık, kurutmalık ve şaraplık–şıralık olmak üzere farklı şekillerde değerlendirilen üzümün, besindeğerini ve antioksidan madde içeriğini zenginleştirmek amacıyla yetiştiricilikte çok farklı uygulamalaryapılabilmekte ve bu uygulamaların başında da büyümeyi düzenleyici madde kullanımları gelmektedir. Buaraştırma Alphonse Lavallée ve Horoz Karası üzüm çeşitlerine ait omcalara hasat öncesi yapılanbrassinosteroid uygulamalarının gerek besin değeri, gerekse antioksidan etkileri bakımından çok değerlibileşikler arasında yer alan α, β, γ ve δ–tokoferol birikimleri üzerine olan etkilerini belirlemek amacıylagerçekleştirilmiştir. Bu amaçla yeni nesil hormonlar arasında yer alan brassinosteroidlerin bir analoğu olan24–eBL, omcalara dört farklı konsantrasyon (0.2, 0.4, 0.6 ve 0.8 ppm) ve üç farklı uygulama dönemini (bendüşme dönemi; tane tutumundan 7 gün sonra +ben düşme dönemi; ile tane tutumundan 7 gün sonra+bendüşme dönemi+ben düşmeden 30 gün sonra) içeren kontrolle birlikte 13 uygulama şeklinde yapılmıştır. İkiyıl süreyle yapılan uygulamalar sonucunda en yüksek α, γ ve δ–tokoferol miktarlarının Horoz Karasıomcalarına ben düşme döneminde yapılan 0.8 ppm 24–eBL uygulamasından elde edildiği tespit edilmiştir.En yüksek β–tokoferol miktarının ise 1. yıl Alphonse Lavallée üzüm çeşidinde tane tutumundan 7 günsonra+ben düşme döneminde yapılan 0.4 ppm 24–eBL uygulamasından, 2. yıl ise Horoz Karası üzümçeşidinde ise ben düşme döneminde yapılan 0.6 ppm 24–eBL uygulamasından elde edildiği belirlenmiştir.

THE EFFECTS OF PREHARVEST 24–EPIBRASSINOLID (24–eBL) APPLICATIONS ON THE ACCUMULATION OF ALPHA, BETA, GAMMA, DELTA TOCOPHEROLS IN ALPHONSE LAVALLÉE AND HOROZ KARASI GRAPE CULTIVARS

Many different applications can be made in cultivation in order to enrich the nutrient and antioxidant contents of grapes evaluated in different forms such as table, raisin, wine and must. The most important treatments in grape growing for this purpose are the uses of plant growth regulators. This study was carried out to determine the effects of preharvest brassinosteroid applications on the accumulation of α, β, γ and δ– tocopherol, among the most valuable compounds in terms of nutrient value and antioxidant effects, in Alphonse Lavallée and Horoz Karası grape cultivars. For this purpose, 13 different treatments including control, four different concentrations (0.2, 0.4, 0.6 and 0.8 ppm) of 24–eBL as an analogue of brassinosteroids among the new generation of hormones, and three different application periods (veraison, 7 days after berry set+veraison, 7 days after berry set+veraison+30 days after veraison) were applied to vines. As a result of the applications performed for two years, the highest amounts of α, γ and δ–tocopherol were obtained from Horoz Karası applied with 0.8 ppm of 24–eBL at veraison. The highest amount of β– tocopherol was found in Alphonse Lavallée applied with 0.4 ppm 24–eBL at 7 days after berry set+veraison and in Horoz Karası applied with 0.6 ppm 24–eBL at veraison.

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