The results showed that the varieties tested expressed different adaptation mechanisms under salt stress however, the increase of leaf proline accumulation was a general indicator for responses to salt stress in all cultivars. | Research Article Turk J Agric For 34 (2010) 451-459 © TÜBİTAK doi: Physiological responses of two Turkish rice (Oryza sativa L.) varieties to salinity Özgür TATAR1, Holger BRUECK2, Mithat Nuri GEVREK1, and Folkard ASCH2,* 1Ege University, Faculty of Agriculture, Department of Field Crops, İzmir - TURKEY 2University of Hohenheim, Institute for Crop Production and Agroecology in the Tropics and Subtropics, Garbenstr. 13, 70599 Stuttgart - GERMANY Received: Abstract: Effects of salinity (60 mM NaCl) on 2 Turkish rice varieties (Kıral and Yavuz) were studied in comparison to 2 international check varieties (IR4630-22-2 tolerant and IR31785-58-1-2-3-3 susceptible) in 2 hydroponic and 1 outdoor soil-based pot experiments. Partitioning of dry matter, leaf chlorophyll concentration, K+ and Na+ uptake, and proline accumulation in the leaves were investigated under both control and salt stress conditions. Dry matter accumulation decreased with salt stress in all varieties, with the decreases being more pronounced in IR31785 and Kıral. The results showed that the varieties tested expressed different adaptation mechanisms under salt stress; however, the increase of leaf proline accumulation was a general indicator for responses to salt stress in all cultivars. Key words: Chlorophyll, K/Na ratio, proline, rice, salinity İki Türk çeltik çeşidinin (Oryza sativa L.) tuzluluğa karşı fizyolojik reaksiyonları Özet: Tuzluluğun (60 mM NaCl) 2 Türk çeltik çeşidi (Kıral ve Yavuz) üzerine etkileri, 2 adet uluslar arası olarak onaylanmış dayanıklı (IR4630-22-2) ve hassas (IR31785-58-1-2-3-3) çeşit ile karşılaştırmalı olarak 2 besin ortamı ve 1 + + açık alan saksı denemesi ile çalışılmıştır. Kuru madde dağılımı, yaprak klorofil içeriği, K ve Na alınımı ve yapraktaki prolin birikimi hem kontrol hem de tuzluluk koşulları altında incelenmiştir. Tuzluluğun etkisi ile kuru madde üretimi tüm çeşitlerde düşmüştür ve tuzluluğun düşüşü IR31785 ve Kıral .
