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Publication Type J
Authors Elhaak, MA; Migahid, MM; Wegmann, K
Author Full Name Elhaak, MA; Migahid, MM; Wegmann, K
Title Ecophysiological studies on Euphorbia paralias under soil salinity and sea water spray treatments
Source JOURNAL OF ARID ENVIRONMENTS
Language English
Document Type Article
Author Keywords Euphorbia paralias; transpiration; sea water spray; salt stress; CAM; water-use efficiency (WUE)
Keywords Plus CRASSULACEAN ACID METABOLISM; CACTUS
Abstract Euphorbia paralias L. was studied on the coastal dunes in Egypt, and its seeds were germinated under greenhouse conditions and subjected to 0, 200 and 400 mM soil salinity in combination with one or two sprays per day by sea water. Phytosociological studies revealed greater importance value for E. paralias at slightly saline locations and on the sea side of the coastal sand dunes. The plant also exhibited low transpiration rate and relative water content but high dry matter content in the dry (summer and autumn) compared with the wet seasons (winter and spring). Under greenhouse conditions, E. paralias responded to the imposed stresses by: decreasing daily mean transpiration, shifting the time of maximum transpiration to be at the time of minimum evaporative demand of the atmosphere, attaining several peaks of transpiration corresponding to favourable conditions, and exhibiting noticeable night transpiration. Combined stress of high soil salinity and sea water spray greatly inhibited plant control of water loss. Salinity alone or in combination with once a day sea water spray decreased transpiration. CO2 fixation at night, as indicated by the accumulation of malic acid, indicated transformation of plant photosynthesis into a CAM pathway. Salinity alone greatly increased night malic acid accumulation compared to sea water spray. The percentage of dead leaves increased after treatments, but the high control on water loss and increased dry matter by night fixation of CO2 increased plant water-use efficiency. (C) 1997 Academic Press Limited.
Author Address UNIV ALEXANDRIA,FAC EDUC,DEPT BIOL,ALEXANDRIA,EGYPT; UNIV TUBINGEN,INST PLANT PHYSIOL CHEM,TUBINGEN,GERMANY
Reprint Address Elhaak, MA (reprint author), TANTA UNIV,FAC SCI,DEPT BOT,TANTA,EGYPT.
Cited Reference Count 27
Times Cited 7
Total Times Cited Count (WoS, BCI, and CSCD) 9
Publisher ACADEMIC PRESS LTD
Publisher City LONDON
Publisher Address 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX
ISSN 0140-1963
29-Character Source Abbreviation J ARID ENVIRON
ISO Source Abbreviation J. Arid. Environ.
Publication Date MAR
Year Published 1997
Volume 35
Issue 3
Beginning Page 459
Ending Page 471
Digital Object Identifier (DOI) 10.1006/jare.1995.0151
Page Count 13
Web of Science Category Ecology; Environmental Sciences
Subject Category Environmental Sciences & Ecology
Document Delivery Number WQ583
Unique Article Identifier WOS:A1997WQ58300008
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