Halofit Salsola crassa’nın Tohum Çimlenmesi Üzerine Tuzluluk, Sıcaklık ve Işığın Etkileri

Yıl 2017, Cilt: 17 Sayı: 1, 1 - 9, 24.04.2017

Hakan Terzi , Mustafa Yıldız Ünal Altuğ

Öz

Halofit bitki türlerinde tohum çimlenmesi özellikle ışık, sıcaklık ve tuzluluk gibi çevresel faktörler

tarafından kontrol edilmektedir. Halofit Salsola crassa’nın tohum çimlenmesi üzerine tuzluluk, sıcaklık

ve ışık etkileşimlerine ilişkin herhangi bir literatür bulunmamaktadır. Bu nedenle, bu araştırmada S.

crassa’nın tohum çimlenmesi üzerine 9 tuz konsantrasyonu (0, 100, 200, 300, 400, 500, 600, 700 ve 800

mM NaCl), 6 sabit sıcaklık (10, 15, 20, 25, 30 ve 35C) ve fotoperiyodun (12 sa ışık: 12 sa karanlık ve

sürekli karanlık) etkileri araştırılmıştır. En yüksek çimlenme yüzdeleri (%98-99) distile suda, 20 ve 25C

sıcaklık uygulamaları ve 12 saatlik fotoperiyotta elde edilmiştir. Tuz konsantrasyonundaki artış özellikle

düşük ve yüksek sıcaklık uygulamalarında tohum çimlenmesinde belirgin bir azalışa neden olmuştur.

Düşük (10 ve 15C) ve yüksek (35C) sıcaklık uygulamaları hem kontrol hem de tuz uygulamalarında

tohum çimlenmesinde belirgin bir şekilde azalmaya neden olmuştur. Tüm sıcaklık uygulamalarında ve

özellikle tuz uygulamalarında ışık ve karanlık uygulamaları arasında önemli farklılıklar bulunmuştur (P <

0.05). Bu sonuçlar, S. crassa’da çimlenme evresi stres toleransının ışık, sıcaklık ve tuzluluk etkileşimleri

tarafından etkilendiğini göstermektedir. Bununla birlikte, 800 mM NaCl konsantrasyonunda

çimlenebilme yeteneğinden dolayı S. crassa’nın tuza oldukça toleranslı bir tür olduğu ileri sürülebilir.

Anahtar Kelimeler

Çimlenme; Işık Sıcaklık Salsola crassa Tuzluluk

Kaynakça

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