EFFECT OF WATER DEFICIT STRESS ON GROWTH, PROLINE ACCUMULATION, LIPID CONTENT AND FATTY ACID COMPOSITION OF PURSLANE

Nasiri | Seyed Jalal Tabatabaei | BolandNazar | Azadmard

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=43026
Date :  2016/02/04
Publish in :    International Journal of Biology,Pharmacy and Allied Sciences


Keywords :ACID

Abstract :

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ABSTRACT Purslane is a drought- and salt-tolerant plant, containing high amounts of ω-3 fatty acids and antioxidants. In this study, purslane seedlings were subjected to different soil water contents; 75, 50 and 25 field capacity(FC), their growth, leaf relative water content (RWC), maximum photochemical efficiency (Fv/Fm), chlorophyll, proline, total lipid content (SPAD index) and the fatty acid composition were determined. Water deficit stress significantly reduced shoot and increased root dry matter. Leaf RWC was decreased 8 and 14 under moderate and severe water deficit stress respectively. The (Fv/Fm) ratio was not affected by water deficit. There was a steady rise in chlorophyll contentwith increase in the stress.Total lipid content increased in the leaves of purslane due to water deficit stress. Linolenic acid (C18:3) proportion increased progressively related to the stress. This increase was accompanied by linoleic, oleic and stearic acid reduction. The ratio of omega-3 to omega-6 fatty acids was significantly changed due tothe stress. Increasing severity of water stresscaused an increase in proline content. These results suggest that water deficit tolerance of purslane plants might be closely related to the increased content of linolenic acid and with the accumulation of proline under water deficit conditions.