Kırmızı Deniz Yosunlarının Fotosentetik Performansı Üzerine Tuzluluğun Etkileri

Abstract

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 fzyolojisini etkilemektedir. Bu nedenle, bu çalışma tuzluluğun bazı kırmızı deniz yosunlarında
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 klorofl floresansının ölçülmesiyle belirlenmiştir. Elde edilen veriler
çalışılan türlerde tuzluluğun fotosentetik performansı önemli ölçüde etkilediğini göstermiştir. 43 ppt’de Porphyra
umbilicalis haricinde çalışılan bütün türlerin maksimum elektron transfer oranı azalmıştır. Tuzluluğa karşı en
yüksek fotosentetik tolerans P. umbilicalis türünde bulunmuştur

Keywords

• Klorofl floresansı,fotosentez,Rhodophyta,tuzluluk

The Effects of Salinity on the Photosynthetic Performance of Red Seaweeds

Abstract

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 signifcant 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 red seaweeds. The samples were collected from southern
region of the Marmara Sea and cultivated in different salinity concentration (23, 33 and 43 ppt). Photosynthetic
performance of samples were determined by measuring variable chlorophyll fluorescence of photosystem II. The
results indicated that, salinity signifcantly influenced photosynthetic performance of studied species. Maximum
electron transfer rate in the all studied species except for Porphyra umbilicalis were reduced at 43 ppt salinity. The
highest salinity tolerance was found at P. umbilicalis

Keywords

• Chlorophyll fluorescence,photosynthesis,Rhodophyta,salinity

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