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Publication Type J
Authors Slama, I., D. Messedi, T. Ghnaya, A. Savoure and C. Abdelly
Title Effects of water deficit on growth and proline metabolism in Sesuvium portulacastrum
Source Environmental and Experimental Botany
Author Keywords halophyte ionic accumulation ornithine-delta-aminotransferase proline dehydrogenase stress delta-aminotransferase cdna salt-stress ornithine aminotransferase radish cotyledons accumulation arabidopsis dehydrogenase expression drought biosynthesis
Abstract Response to water deficit was studied in Sesuvium portulacastrum, a promising halophyte for saline soil stabilisation and covering. After their multiplication and ample irrigation, seedlings were cultivated for 4 weeks under optimal or limiting water supply (respectively, 100 and 25% of field capacity, FC). A subset of stressed plants was thereafter subjected to the optimal regime of irrigation. Weekly harvests were carried out during 70 days of treatment. Measured parameters were growth, tissue water and proline contents, as well as ornithine-delta-aminotransferase (delta-OAT. EC 2.6.1.13) and proline dehydrogenase (PDH, EC 1.5.1.2) activities. Water deficit reduced the growth (whole plant biomass and leaf number). increased root/shoot ratio and led to a significant decrease in leaf relative water content (RWC). In water-stressed plants, the concentration of K+, Na+, Cl- and proline, as well as delta-OAT activity increased significantly. Inversely, PDH activity was impaired. Rewatering stressed plants restored these parameters at values close to those of plants permanently irrigated with 100% FC. It can be assumed that ornithine pathway contributed via an increase in delta-OAT activity to proline synthesis in water-stressed plants of S. portulacastrum at the adult stage. Results suggest also that S. portulacastrum conserved its growth potentialities and nutrient acquisition systems during long-term water deficit stress, as shown by the re-establishment of the growth activity and leaf development, following relief of stress. (c) 2005 Elsevier B.V. All rights reserved.
Author Address INRST, Lab Adaptat Plantes Stress Abiot, Hammam Lif, Tunisia Univ Paris 06, CNRS, UMR7632, F-75252 Paris 05, France Abdelly, C (reprint author), INRST, Lab Adaptat Plantes Stress Abiot, BP 95, Hammam Lif, Tunisia chedly.abdelly@inrst.rnrt.tn
ISSN 0098-8472
ISBN 0098-8472
29-Character Source Abbreviation Environ. Exp. Bot.
Publication Date Jul
Year Published 2006
Volume 56
Issue 3
Beginning Page 231-238
Digital Object Identifier (DOI) 10.1016/j.envexpbot.2005.02.007
Unique Article Identifier WOS:000237771200002
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