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Changes in anatomical structure and levels of endogenous phytohormones during leaf rolling in Ctenanthe setosa under drought stress

Leaf rolling occurs as a response to water deficit and its level increases as the drought period is progressing in plants. Changes in anatomical structure and levels of endogenous phytohormones were investigated under drought stress during leaf rolling in Ctenanthe setosa. | Turk J Biol 33 (2009) 115-122 © TÜBİTAK doi:10.3906/biy-0806-6 Changes in Anatomical Structure and Levels of Endogenous Phytohormones during Leaf Rolling in Ctenanthe setosa under Drought Stress Nihal KUTLU1, Rabiye TERZİ1, Çiğdem TEKELİ2, Gülcan ŞENEL2, Peyami BATTAL3, Asım KADIOĞLU1 1 Faculty of Arts & Science, Department of Biology, Karadeniz Technical University, Trabzon - TURKEY 2 Faculty of Arts & Science, Department of Biology, Ondokuz Mayıs University, Samsun - TURKEY 3 Faculty of Arts & Science, Department of Biology, Yüzüncü Yıl University, Van - TURKEY Received: 01.05.2008 Abstract: Leaf rolling occurs as a response to water deficit and its level increases as the drought period is progressing in plants. Changes in anatomical structure and levels of endogenous phytohormones were investigated under drought stress during leaf rolling in Ctenanthe setosa. Leaf water potential (Ψleaf), some anatomical parameters, and the levels of phytohormones were determined at different visual levels of leaf rolling from 1 to 4. Ψleaf, thickness of mesophyll and lamina, and width/length ratio of hypodermis cells of leaves decreased while leaf rolling level increased. Diameters of xylem vessels and median vein, and length of upper and lower stomatal guard cells also decreased during leaf rolling. The amount of indole-3-acetic acid (IAA) increased up to the 3rd level of leaf rolling but it declined to the value of the 1st level at the 4th level of rolling. The gibberellic acid (GA3) level changed irregularly during leaf rolling. Trans-zeatin and abscisic acid (ABA) amounts also increased during the rolling period. The analysis showed that changes in the levels of these phytohormones may affect the anatomical structure of the leaf during the rolling period under drought stress. Key Words: Anatomical structure, Ctenanthe setosa, drought, leaf rolling, phytohormones Kuraklık Stresi Koşullarındaki Ctenanthe setosa’da Yaprak Kıvrılması Sırasında Anatomik Yapı ve Endojen .