TAILIEUCHUNG - Effects of Chromium VI stress on green alga Ulva lactuca (L.)

In order to contribute to the understanding of its response to metal stress, Ulva lactuca (L.) was treated with different concentration of chromium (VI) (, , 1, and 5 mM K2CrO4), and alterations in Fv/Fm ratio (maximal photochemical efficiency of PSII) and cell viability were investigated. | Turk J Biol 34 (2010) 119-124 © TÜBİTAK doi: Effects of Chromium VI stress on green alga Ulva lactuca (L.) Dilek ÜNAL1,*, Nuray O. IŞIK2, Atakan SUKATAR1 1 Department of Biology, Faculty of Science, Ege University, İzmir - TURKEY 2Department of Leather Engineering, Ege University, İzmir - TURKEY Received: Abstract: In order to contribute to the understanding of its response to metal stress, Ulva lactuca (L.) was treated with different concentration of chromium (VI) (, , 1, and 5 mM K2CrO4), and alterations in Fv/Fm ratio (maximal photochemical efficiency of PSII) and cell viability were investigated. Significant alterations of the maximal photochemical efficiency of PSII (Fv/Fm) ratio were observed in response to the increase in chromium concentration. The Fv/Fm ratio decreased in Ulva lactuca following 2 h treatment with 1 and 5 mM Cr(VI) solution. The cell viability was decreased in cells exposed to higher Cr(VI) concentrations. Thallus cell morphology was altered in thalli exposed to chromium. A cytotoxic effect of chromium was demonstrated for the first time using acridine orange/ethidium bromide staining in macroalgae. In 1 and 5 mM of Cr(VI) treated samples, the rate of necrotic cells increased about and , respectively. Key words: Chromium VI, photosynthesis, Ulva lactuca, acridine orange/ethidium bromide staining Yeşil Alg Ulva lactuca (L.) üzerinde Krom (VI) Stresinin Etkileri Özet: Farklı konsantrasyonlarda krom (VI) (0,2, 0,5, 1 ve 5 mM K2CrO4) uygulaması yapılan Ulva lactuca (L.)’da metal stresine yanıt olarak PSII fotosentetik kuantum verimi, hücre canlılığı, ve sitotoksik etkiler üzerindeki değişimler araştırılmıştır. Krom konsantrasyonundaki artışa bağlı olarak fotosentetik kuantum verim (Fv/Fm) oranında önemli ölçüde değişimler olduğu gözlenmiştir. U. lactuca’nın 2 saat, 1 ve 5 mM Cr(VI) uygulanmasını takiben Fv/Fm oranı düşmüştür. Evan’s blue alınım sonuçları ise 1 ve 5 mM Cr(VI) uygulanmış .

• Sinh học
• Chromium VI
• Ulva lactuca
• Acridine orange
• Ethidium bromide staining
• Cell morphology
• Hexavalent chromium
• Pseudomonas sp
• C 171
• Chromium hydroxide
• Cell elongation
• Potassium dichromate
• Rhizosphere bacterial strains
• Cr(VI) tolerance
• Plant growth promoting substances
• Antioxidant system
• Chromium(VI) toxicity
• Chromium (VI) removal
• Thermodynamic parameter
• Novel potential adsorbent material
• Agitation period
• Pennisetum setaceum
• Magnetic nanoparticles
• Composite dosage
• CTAB modified magnetic nanoparticles
• Removal of chromium
• Contaminated water
• Adsorption behaviour
• Adsorption behaviour of chromium
• Surface modified sugarcane waste
• Sugarcane waste
• Boehms titration
• Journal of Chemistry
• Active carbon
• Water treatment
• While trivalent chromium
• Chemical sciences
• Biological sciences
• Chromium ion
• Adsorption of Cr(VI)
• Activated carbon cloth
• Oxidized activated carbon
• Tannery waste
• Immobilized silica gel
• Tannery liquid waste
• Cr (VI) stock solution
• BMC Chemistry
• Ficus nitida leaves
• Adsorption runs
• Freundlich and Temkin models
• Thermodynamic activation
• Adsorption comparison
• Environmental pollution
• Cleaner environment
• Chromium precipitation