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Morphophysiological and biochemical changes in tall fescue (Festuca arundinacea Schreb.) under combined salinity and deficit irrigation stresses
|مقاله 4، دوره 20، شماره 1، فروردین 2015، صفحه 29-38 اصل مقاله (175.69 K)|
|نوع مقاله: Research Paper|
|شناسه دیجیتال (DOI): 10.22059/jdesert.2015.54080|
|Reza Manuchehri؛ Hassan Salehi*|
|Department of Horticultural Science, College of Agriculture, Shiraz University, Shiraz, Iran|
|Water salinity and drought are the major abiotic stresses limiting turf grass growth. On the other hand, shortage of water|
resources and salinity of water and soil in the arid and semi-arid zones such as Iran, are the restricting factors in developing
lawn turf grasses. An experiment was conducted to evaluate the combined effects of water salinity and deficit irrigation on
tall fescue (Festuca arundinacea Schreb.). This study was conducted under outdoor conditions in a completely randomized
design with factorial arrangements. Treatments included four water salinity levels (0.5, 3, 6 and 9 dS.m-1) and three deficit
irrigation regimes (50%, 75% and 100% FC) with five replicates under outdoor conditions. Results indicated a rise in the
ion leakage, and soluble sugar and proline concentration and a decrease in visual quality, shoot length, leaf area and fresh
and dry weights of shoot, leaf relative water content (RWC), leaf chlorophyll content and photosynthetic rate and starch
content with an increase in the levels of both stresses. Antioxidant enzymes, superoxide dismutase (SOD, EC 184.108.40.206), and
catalase (CAT, EC 220.127.116.11) showed higher activity under moderate drought or water salinity conditions; however, this
parameter decreased at higher levels of these salinity stresses. Practically, based on the results of the present study, tall
fescue could be grown under moderate levels of the combined stresses of water shortage and salinity without considerable
damage to the plant at the physiological and/or biochemical level. This is the first report on applying the combined stresses
of water and salinity on an important agricultural crop.
|Antioxidant؛ Tall fescue؛ Deficit irrigation؛ Turf grass؛ Water salinity|
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