FRENK ÜZÜMLERİNDE {Ribes nigrum LL. Ribes rubrum L.) ÇİÇEKLENMEYLE BÜNYESEL HORMANLAR ARASINDAKİ İLİŞKİLER
özetBu çalışma, Erzurum şartlarında Mulka, Rosenthaîs ve Silvergieter Frenküzümüçeşitlerine, tomurcukların teşekkül döneminden çiçeklerin açılmasınakadar geçen devrede, bünyesel hormonların nasıl bir değişim gösterdiğini belirleyebilmekamacıyla yapılmıştır.Tomurcuklardaki büyümeyi engelleyici maddeler yaz ortasında nispeten yüksekbulunmuş ve bunların etkilerinin Eylül ortasına doğru azaldığı ve Kasım, Ocak,hatta Şubatta bile etkilerin yüksek olduğu belirlenmiştir. Engelleyici maddelerdeAralık ayından itibaren nispi bir azalma başlamış ve bunların etkinlikleri Nisanayında minimuma düşmüştür. Büyümeyi uyartıcı maddelerin ise Mart ayındanitibaren etkili olmaya başladıkları saptanmıştır.SUMMARYThe Relation Between Blooming and. Endogenous Hormones in Currants (Ribes nigrum L., Ribes rubrum L.).This study was carried out to determine the changing of the endogenoushormones from bud formation to blooming period in Mulka, Rosenthals, andSilvegieter currant cvs. grown in Erzurum conditions.Bud samples were extracted with methanol, lsopropil alcohol: ammonia:water (8:1:1 v/v) was used as tank solution for. paper chromatography. Oatcoleoptile test was used to determine the Rf value of growth inhibitors andpromoters. The influence of growth inhibitors and promoters was changedmonth from according to the oat coleoptile test. The growth promoters werefound in the sections of .Rf -0.1-0.1 and 0.7-Û.9 It was observed that the mosteffective sections of Rf for growth inhibitors was between 0.3-0.5 values.The effect of growth inhibitors was high during mid-summer. But they declinedfrom mid-summer to mid-September. However they began to increase againfrom mid-September to December. It was found that the effect of growth inhibitorswas high even in January. But this effect declined steadily and it was theminimum in April. On the other hand the effect of growth promoters began toincrease steadily from mid-March to on. The influence of growth inhibitors wasless in Rosenthals and Silvegrieter than Mulka on 10 th of April which was thedate of bud burst for previous cvs.
