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Salinity Effects on Growth Attributes Mineral Uptake, Forage Quality and Tannin Contents of Acacia saligna (Labill.) H. Wendl

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Author(s): A.A. Elfeel | Ahmed A. Bakhashwain

Journal: Research Journal of Environmental and Earth Sciences
ISSN 2041-0484

Volume: 4;
Issue: 11;
Start page: 990;
Date: 2012;
Original page

Keywords: Biomass production | relative water content | salinity | specific leaf area | tannins

ABSTRACT
A greenhouse experiment was conducted at the Agricultural Research Station, King Abdulaziz University to examine the effects of salinity on biomass production, physiological responses, mineral uptake, leaves quality (protein, fiber, ash) and tannin content. A 4 months old seedlings were exposed to an increasing salt concentrations: (Bore well water, 7, 9 and 12 dS/m, respectively). Physiological traits Specific Leaf Area (SLA), Leaf Dry Matter Content (LDMC) and Relative Water Content (RWC)) were measured at different growth development. Leaves minerals (N, P, Na, Ca, K, Mg), protein, fiber and ash contents were analyzed. Condensed tannins were assayed by vanillin HCI method. The results showed that salinity resulted in reduced biomass production and growth in response to lower SLA, lower RWC and higher LDMC with increasing salt concentrations. The salts accumulation in soil media resulted in higher Na associated with lower (N, P, Ca, K, Mg) contents in leaves, while tannin was increased with increasing salt concentration. Protein, ash and fiber contents were significantly differed among salt treatments. Despite the effects of salt stress on growth, the relatively good performance of the seedlings under all levels of salt concentrations indicates that this species has adaptive mechanisms to withstand relatively high levels of salinity.
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