HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Related articles in Crop Science Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (17) Citing Articles via Google Scholar Google Scholar Articles by Cyril, J. Articles by Baird, W. V. Search for Related Content PubMed Articles by Cyril, J. Articles by Baird, W. V. Agricola Articles by Cyril, J. Articles by Baird, W. V. Related Collections Temperature Stress Turfgrass Cell Biology & Molecular Genetics

TURFGRASS SCIENCE

Changes in Membrane Polar Lipid Fatty Acids of Seashore Paspalum in Response to Low Temperature Exposure

^a Dep. of Hortic., Poole Agric. Center, Box 340375, Clemson Univ., Clemson, SC 29634-0375
^b Dep. of Genetics and Biochemistry, Clemson Univ., Clemson, SC 29634-0324
^c Univ. of Georgia, 1109 Experiment Street, Griffin, GA 30223-1787

* Corresponding author (vbaird{at}clemson.edu)

Seashore paspalum (Paspalum vaginatum Sw.) is a warm-season turfgrass, best known for its superior salt tolerance. Plants are subject to injury during winter conditions along the northern boundary of their zone of adaptation. New cultivars that are more tolerant to low temperatures are needed for use in the transition zone. Cold tolerance has been correlated with the degree of unsaturation in membrane lipid fatty acids. Unsaturated fatty acids are thought to aid in maintaining membranes in a fluid state necessary for biological functioning (homeophasic adaptation). The primary objective was to characterize fatty acid composition of membrane lipids in three genotypes differing in cold tolerance. A second objective was to investigate changes in fatty acid content in these genotypes during exposure to low temperatures. Cold-treated plants were exposed to a 10-h photoperiod at 8°/4°C day/night temperatures and light intensity of 250 µmol m^-2 s^-1 photosynthetic photon flux density for 3 wk. Rhizomes and crowns were harvested at 7-d intervals. Total lipids were extracted and the polar lipids separated by thin-layer chromatography. Fatty acids were identified by gas chromatography (GC) and mass spectroscopy. In all three genotypes, the two saturated fatty acids, palmitic acid and stearic acid, did not change during cold treatment. The triunsaturated linolenic acid increased significantly during low temperature exposure. The magnitude of change was greater in the finer-textured and more cold-tolerant PI 509018-1 (‘SeaIsle1’) than in the intermediately cold-tolerant ‘Adalayd’ or in the cold-susceptible, coarse-textured PI 299042. These findings suggest that accumulation of linolenic acid partly explains the differential response in their cold tolerance.

Abbreviations: DBI, double bond index • GC, gas chromatography • MS, mass spectrometer

Related articles in Crop Science:

This issue in Crop science

Crop Science 2002 42: 1763-1765. [Full Text]  

This article has been cited by other articles:

				Q. Zhang, J. Fry, C. Rajashekar, D. Bremer, and M. Engelke Membrane Polar Lipid Changes in Zoysiagrass Rhizomes and Their Potential Role in Freezing Tolerance J. Amer. Soc. Hort. Sci., May 1, 2009; 134(3): 322 - 328. [Abstract] [Full Text] [PDF]

				R. Valluru and W. Van den Ende Plant fructans in stress environments: emerging concepts and future prospects J. Exp. Bot., August 1, 2008; 59(11): 2905 - 2916. [Abstract] [Full Text] [PDF]

				X. Zhang, K. Wang, and E. H. Ervin Bermudagrass Freezing Tolerance Associated with Abscisic Acid Metabolism and Dehydrin Expression during Cold Acclimation J. Amer. Soc. Hort. Sci., July 1, 2008; 133(4): 542 - 550. [Abstract] [Full Text] [PDF]

				A. J. Patton and Z. J. Reicher Zoysiagrass Species and Genotypes Differ in Their Winter Injury and Freeze Tolerance Crop Sci., July 30, 2007; 47(4): 1619 - 1627. [Abstract] [Full Text] [PDF]

				J. Bakht, A. Bano, and P. Dominy The role of abscisic acid and low temperature in chickpea (Cicer arietinum) cold tolerance. II. Effects on plasma membrane structure and function J. Exp. Bot., November 1, 2006; 57(14): 3707 - 3715. [Abstract] [Full Text] [PDF]

				G. C. Munshaw, E. H. Ervin, C. Shang, S. D. Askew, X. Zhang, and R. W. Lemus Influence of Late-Season Iron, Nitrogen, and Seaweed Extract on Fall Color Retention and Cold Tolerance of Four Bermudagrass Cultivars Crop Sci., January 24, 2006; 46(1): 273 - 283. [Abstract] [Full Text] [PDF]