TAILIEUCHUNG - Effects of cold and salicylic acid treatments on nitrate reductase activity in spinach leaves

The effects of long-term cold (5/3 °C) and salicylic acid (SA) ( mM) treatments on the diurnal pattern of nitrate reductase (NR) activity in spinach (Spinacia oleracea L. cv. Gladiator) leaves were investigated. | B. AYDIN, B. NALBANTOĞLU Turk J Biol 35 (2011) 443-448 © TÜBİTAK doi: Effects of cold and salicylic acid treatments on nitrate reductase activity in spinach leaves Belinda AYDIN1, Barbaros NALBANTOĞLU2 1 Biotechnology Application and Research Center, Atatürk University, 25240 Erzurum - TURKEY 2 Department of Chemistry, Faculty of Science, Atatürk University, 25240 Erzurum - TURKEY Received: Abstract: The effects of long-term cold (5/3 °C) and salicylic acid (SA) ( mM) treatments on the diurnal pattern of nitrate reductase (NR) activity in spinach (Spinacia oleracea L. cv. Gladiator) leaves were investigated. When the activities with cold treatment are compared to the control (20/15 °C), NR activity was decreased by 5 °C in the light period and by 3 °C in the dark period. The cold treatment also affected the timing of circadian rhythm in the diurnal pattern of NR activity. When the activities with SA treatments are compared to control and cold, it was determined that SA increases NR activity in the light period of control while SA decreases NR activity in the light period of cold. Key words: Cold, nitrate reductase activity, salicylic acid, Spinacia oleracea Soğuk ve salisilik asit uygulamalarının ıspanak yapraklarındaki nitrat redüktaz aktivitesine etkileri Özet: Ispanak (Spinacia oleracea L. cv. Gladiator) yapraklarındaki nitrat redüktaz (NR) aktivitesinin gün içindeki değişimi üzerine uzun süreli soğuk (5/3 °C) ve salisilik asit (SA) ( mM) uygulamalarının etkileri incelenmiştir. Soğuk uygulamalı aktiviteler kontrol (20/15 °C) ile karşılaştırıldığında, NR aktivitesi 5 °C ile ışık periyodunda ve 3 °C ile karanlık periyodunda azalmıştır. Soğuk uygulaması NR aktivitesinin gün içindeki sirkadian ritiminin zamanı üzerinde de etkili olmuştur. SA uygulamalı aktiviteler kontrol ve soğuk ile karşılaştırıldığında, SA’nın soğuğun ışık periyodunda NR aktivitesini azaltırken kontrolün ışık periyodunda NR aktivitesini arttırdığı .

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