Journal
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
Volume 52, Issue 2, Pages 131-138Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2004.01.011
Keywords
Agrostis palustris; cell membrane stability; creeping bentgrass; glycinebetaine; nitrogen application
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The effects of nitrogen nutrition on cell membrane stability (CMS), leaf water potential, N, K, P, Ca, Mg, and glycinebetain concentrations in C-3 plant, Agrostis palustris Huds. (creeping bentgrass) were assessed under water-stress conditions. Water-stressed plants showed greater adaptation to water stress at higher nitrogen (N) levels. Cell membrane stability measured by the polyethylene glycol (PEG) technique was increased by increased N application. Osmotic potential decreased and turgor pressure increased with increased N application. Nitrogen, K, Ca, and glycinebetaine concentrations in leaf tissues increased with increased N application under water-stress conditions. Malondialdehyde (MDA) concentration in leaves which is an indicator of lipid peroxidation, was greater in the water-stress treatment than in the control, however, MDA concentration decreased with increased N application in the water-stressed plants. The results suggested that higher levels of N nutrition may have contributed to drought tolerance in creeping bentgrass by preventing cell membrane damage and enhancing osmoregulation. (C) 2004 Elsevier B.V. All rights reserved.
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