Güler ÇOLAK, Sebahat Töre YAMAN, Necmettin CANER

Farklı Tuzluluk Stresi Koşullarının Lycopersicon esculentum Mill.’in Bazı Fizyolojik Gelişim Parametreleri Üzerine Etkileri

Lycopersicon esculentum Mill.’in bazı fizyolojik gelişim parametreleri üzerine Ca(NO3)2 ve MgSO4 tipi tuzluluğun etkilerini incelemeyi amaçlayan çalışmada, fotoperyodik indüksiyon altında L. esculentum Mill. cv. H-2274’ün çimlenme oranlarında tuz stresi etkilerinin ilk görülmeye başlandığı konsantrasyon değerleri her iki tuz tipi için de 2000 ppm’di. Karanlık şartlarda Ca(NO3)2 tuzluluğu 2000 ppm, MgSO4 tuzluluğu 5000 ppm’den itibaren toksik etkilerini hissettirdi. Aynı konsantrasyon değerleri etiolasyonun teşvik edildiği inkübasyon ortamlarında L. esculentum Mill. cv. 11D-230 içinde geçerliydi. Fotoperyot şartlarında ise Ca(NO3)2 tuzluluğu 200 ppm, MgSO4 tuzluluğu 500 ppm’den itibaren indirgeyici özelliklere sahipti. L. esculentum genotiplerine ait fideciklerde hipokotil, kök ve kotiledon yaş ağırlıklarında artan Ca(NO3)2 ve MgSO4 konsantrasyonlarının etkileri her iki tuz düzeyinde tüm konsantrasyon serileri açısından genel olarak değerlendirildiğinde, H-2274 fideciklerinde fotoperyodik indüksiyon altında hipokotil (t=3,187; p=0.002), kök (t=3,232; p=0.002) ve kotiledon yaş ağırlıklarında (t=2,168; p=0.034), karanlık şartlarda hipokotil yaş ağırlıklarında (t=2,879; p=0.005) Ca(NO3)2 uygulamaları ile MgSO4 uygulamalarından daha yüksek ortalama değerler elde edildi. Karanlık şartlarda kök yaş ağırlıkları da Ca(NO3)2 uygulamaları ile daha yüksek olmakla birlikte, bu grupta Ca(NO3)2-MgSO4 uygulamaları arasındaki farklılığın istatistiki değeri yoktu (t=1,086; p=0.281). Karanlık şartlarda 11D-230 fideciklerinde Ca(NO3)2 uygulamaları ile MgSO4 uygulamalarından daha yüksek kotiledon yaş ağırlıklarına ulaşıldı (t=2,665; p=0,011).

Anahtar Kelimeler:

MgSO4 ve Ca(NO3)2, tuz stresi, Lycopersicon esculentum Mill.

The Effects of Different Salinity Stress Conditions on Some Physiological Growth Parameters of Lycopersicon esculentum Mill.

The aim of this study is to examine effects of Ca(NO3)2 and MgSO4 type salinity stress on some physiological growth parameters of Lycopersicon esculentum Mill. concentration values for both salt types were 2000 ppm when effects of salt stress were first observed in germinating rates of L. esculentum Mill. cv. H-2274 under photoperiodic induction conditions. Toxic effects of Ca(NO3)2 and MgSO4 salinities were seen as of 2000 ppm and 5000 ppm respectively under dark conditions. The same concentration values were also effective for L. esculentum Mill. cv. 11D-230 under incubation conditions encouraging etiolation. Ca(NO3)2 salinity acquired reducing properties as of 200 ppm and MgSO4 salinity had the same properties as of 500 ppm under photoperiodic conditions. Upon general evaluation of the effects of increasing Ca(NO3)2 and MgSO4 concentrations in hypocotyl, root and cotyledon fresh weights of seedlings of L. esculentum genotypes in terms of all concentration series for both salts, Ca(NO3)2 applications yielded higher mean values than MgSO4 applications for H-2274 seedlings in hypocotyl (t=3,187; p=0.002), root (t=3,232; p=0.002) and cotyledon fresh weights (t=2,168; p=0.034) under photoperiodic induction and hypocotyl fresh weights (t=2,879; p=0.005) under dark conditions. Although root fresh weights under dark conditions were higher with Ca(NO3)2 applications, there was no statistical significance of the difference between Ca(NO3)2-MgSO4 applications within this group (t=1,086; p=0.281). Higher cotyledon fresh weights were obtained with Ca(NO3)2 applications for 11D-230 seedlings under dark conditions when compared to MgSO4 applications (t=2,665; p=0,011).

Keywords:

MgSO4 and Ca(NO3)2, salt stress, Lycopersicon esculentum Mill.,

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