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Geungjoo Lee,Robert N. Carrow,Ronny R. Duncan 한국원예학회 2008 Horticulture, Environment, and Biotechnology Vol.49 No.1
Seashore paspalum (Paspalum vaginatum Swartz) is a warm season turfgrass recognized as the most salt tolerant among the turfgrass species. This experiment was designed to analyze carbohydrate components in a salt tolerant ecotype HI 101 of seashore paspalum turfgrass, which was grown in a nutrient solution at ECw50 (50 dSㆍm?¹) salinized with a sea-salt mixture (i.e., sea water = 54 dSㆍm?¹). Freeze-dried and ground aerial parts were extracted in 80% or 100% methanol, which were further hydrolyzed for a composition analysis by using a GC or GC-MS method. A GC method for detecting carbohydrate types showed that HI101 contained small amounts of arabinose (3.6 mole%), xylose (2.6%), mannose (1.2%), and glucuronic acid (5.1%), while the major components were galactose and glucose at 18 and 70%, respectively. Another alditol acetate method (GC-MS), for detection of neutral sugars, also indicated different kinds of carbohydrate with a higher amount of galactose (17 mole%) and glucose (62%), as well as minor carbohydrates such as xylose (7.8%), arabinose (4.7%), rhamnose (4.4%), and mannose (3.9%). In the previous analysis, some sucrose, fructose, myo-inositol, and glucose had already been accounted for; thus, the major peak might be a hexose galactose which was positively accumulated in the HI 101 with increasing salinity and incorporated into a cell-wall polysaccharide, revealing it as a compatible solute and osmoprotectant. The calculated solute potential by galactose and glucose was -2.5 and -12.4 bar, respectively, which accounted for 10 and 48% of a solute potential decrease at the 50 dSㆍm?¹ salinity level.