Kırmızı Deniz Yosunlarının Fotosentetik Performansı Üzerine Tuzluluğun Etkileri

İntertidal bölgede yaşayan deniz yosunları yüksek ışık, kuruma, radyasyon, yüksek sıcaklık ve tuzluluk gibiçevresel streslere büyük oranda maruz kalmaktadır. Tuzluluk en önemli abiyotik streslerden biridir ve birçok açıdandeniz yosunlarının fzyolojisini etkilemektedir. Bu nedenle, bu çalışma tuzluluğun bazı kırmızı deniz yosunlarındafotosentetik performans üzerine etkilerini belirlemek amacıyla yapılmıştır. Örnekler Marmara Denizi’nin güneykıyılarından toplanmış ve farklı tuz derişimlerinde (23, 33 ve 43 ppt) kültüre alınmıştır. Örneklerin fotosentetikperformansı fotosistem II’nin değişen klorofl floresansının ölçülmesiyle belirlenmiştir. Elde edilen verilerçalışılan türlerde tuzluluğun fotosentetik performansı önemli ölçüde etkilediğini göstermiştir. 43 ppt’de Porphyraumbilicalis haricinde çalışılan bütün türlerin maksimum elektron transfer oranı azalmıştır. Tuzluluğa karşı enyüksek fotosentetik tolerans P. umbilicalis türünde bulunmuştur

The Effects of Salinity on the Photosynthetic Performance of Red Seaweeds

Macroalgae living in the intertidal zone are exposed to a wide range of environmental stress, such ashigh light, desiccation, radiation, high temperature and salinity. Salinity stress is one of the most signifcant abioticstresses and affects to vary aspect of macroalgae physiology. Therefore, this study performed to investigate theeffect of salinity on photosynthetic performance of some red seaweeds. The samples were collected from southernregion of the Marmara Sea and cultivated in different salinity concentration (23, 33 and 43 ppt). Photosyntheticperformance of samples were determined by measuring variable chlorophyll fluorescence of photosystem II. Theresults indicated that, salinity signifcantly influenced photosynthetic performance of studied species. Maximumelectron transfer rate in the all studied species except for Porphyra umbilicalis were reduced at 43 ppt salinity. Thehighest salinity tolerance was found at P. umbilicalis

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Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi-Cover
  • ISSN: 2146-0574
  • Yayın Aralığı: Yılda 4 Sayı
  • Başlangıç: 2011
  • Yayıncı: -