Kırbağ Fikriye ZENGİN, Alpaslan KOÇAK, Ömer MUNZUROĞLU

Ayçiçeği (Helianthus annuus L.) fidelerinde kök, gövde ve yaprak ile yaprak disklerinin absisik asit düzeyleri üzerine civanın $(Hg^{++})$ etkileri

Bu çalışmada ayçiçeği fidelerinin ve ayçiçeği yaprak disklerinin absisik asit içerikleri üzerine civanın etkileri araştırıldı. Bir haftalık ayçiçeği fideleri civa klorür (HgCl2) ün farklı konsantrasyonlarında (0.03, 0.05 ve 0.07 mM) on gün süreyle büyütüldü. Fidelerin absisik asit düzeyleri kök, gövde ve yaprak dokularında HPLC ile tespit edildi. Elde edilen sonuçlara göre civa stresi altında büyütülen ayçiçeği fidelerinin kök, gövde, yaprak, fide ve yaprak disklerindeki absisik asit miktarları önemli artışlar gösterdi. Civa tuzu uygulanan ayçiçeği bitkilerinin kök, gövde, yaprak, fide ve yaprak disklerinde absisik asit miktarının kontrole göre sırasıyla % 141-206, % 131-269, % 223-300, % 202-287 ve % 277-367 arasında değişen oranlarda (p

Effects of mercury $(Hg^{++})$ on the abscisic acid contents of root, shoot, leaf and leaf disc in sunflower (Helianthus annuus L.) seedlings

In this study, the effects of mercury (HgCl2) on abscisic acid contents of sunflower seedlings and leaf discs were investigated. Also one-week-old sunflower seedlings were used. Seedlings were left in the mercury chloride at 0.03, 0.05 and 0.07 mM concentration prepared with hoagland solution ten day growing. Abscisic acid contents tissues root, shoot, leaf of seedlings were determined by HPLC. According the results we have obtained, mercury stress caused increased at significant rations, in the abscisic acid contents of root, shoot, leaf, seedling and leaf discs. The abscisic acid contents of root, shoot, leaf, seedling and leaf discs the sunflower to which mercury salt treatment were increased by 141-206%, 131-269%, 223-300%, 202-287% and 277-367 % (p

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