Gamze YILDIZ, Şeyma TİRYAKİ

Tuz Derişiminin Denizel Kahverengi Alglerin Fotosentetik Performansı Üzerine Etkileri

İntertidal bölgede yaşayan deniz yosunları yüksek ışık, kuruma, radyasyon, yüksek sıcaklık ve tuzlulukgibi çevresel streslere büyük oranda maruz kalmaktadır. Tuzluluk en önemli abiyotik streslerden biridirve birçok açıdan deniz yosunlarının fizyolojisini etkilemektedir. Bu nedenle, bu çalışma tuzluluğun bazıdenizel kahverengi alglerde (Scytosiphon lomentaria ve Ectocarpus siliculosus) fotosentetik performansüzerine etkilerini belirlemek amacıyla yapılmıştır. Örnekler Marmara Denizi’nin güney kıyılarındantoplanmış ve farklı tuz derişimlerinde (23, 33 ve 43 ppt) kültüre alınmıştır. Örneklerin fotosentetikperformansı 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 transferoranı farklı uygulamalar arasında istatistiksel olarak farklılık göstermemiştir. Elde edilen veriler farklı tuzderişimlerine maruz kalan her iki türün, fotosentetik olarak stres altında olmadığını ve tuzlulukdeğişimlerine karşı toleranslı olduklarını göstermektedir.

The Effects of Salinity on Photosynthetic Performance of Brown Seaweeds

Macroalgae living in the intertidal zone are exposed to a wide range of environmental stress, such as high light, desiccation, radiation, high temperature and salinity. Salinity stress is one of the most significant abiotic stresses and affects to vary aspect of macroalgae physiology. Therefore, this study performed to investigate the effect of salinity on photosynthetic performance of some brown seaweeds (Scytosiphon lomentaria ve Ectocarpus siliculosus). The samples were collected from southern region of the Marmara Sea and cultivated in different salinity concentration (23, 33 and 43 ppt). Photosynthetic performances of samples were determined by measuring variable chlorophyll fluorescence of photosystem II. In this sudy, Fv/Fm ratio, chlorophyll-a content and relative electron transport rate of samples exposed to high salinity did not significantly differ among the different treatment. The results indicated that, both species exposed to different salinity are not photosynthetically stressed and they are tolerant to salinity changes.

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