Tuz Derişiminin Denizel Kahverengi Alglerin Fotosentetik Performansı Üzerine Etkileri

Yıl 2018, Cilt: 18 Sayı: 3, 751 - 756, 30.12.2018

Gamze Yıldız Şeyma Tiryaki

Öz

İntertidal bölgede yaşayan deniz yosunları yüksek ışık, kuruma, radyasyon, yüksek sıcaklık ve tuzluluk gibi çevresel streslere büyük oranda maruz kalmaktadır. Tuzluluk en önemli abiyotik streslerden biridir ve birçok açıdan deniz yosunlarının fizyolojisini etkilemektedir. Bu nedenle, bu çalışma tuzluluğun bazı denizel kahverengi alglerde (Scytosiphon lomentaria ve Ectocarpus siliculosus) fotosentetik performans üzerine etkilerini belirlemek amacıyla yapılmıştır. Örnekler Marmara Denizi’nin güney kıyılarından toplanmış ve farklı tuz derişimlerinde (23, 33 ve 43 ppt) kültüre alınmıştır. Örneklerin fotosentetik performansı fotosistem II’nin değişen klorofil floresansının ölçülmesiyle belirlenmiştir. Bu çalışmada, yüksek tuz derişimine maruz kalan örneklerin Fv/Fm oranı, klorofil-a içeriği ve göreceli elektron transfer oranı farklı uygulamalar arasında istatistiksel olarak farklılık göstermemiştir. Elde edilen veriler farklı tuz derişimlerine maruz kalan her iki türün, fotosentetik olarak stres altında olmadığını ve tuzluluk değişimlerine karşı toleranslı olduklarını göstermektedir.

Anahtar Kelimeler

Esmer deniz yosunu, Fotosentez, Klorofil-a, Tuzluluk

Kaynakça

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