232-11 Membrane Lipid Composition and Drought Tolerance In Bermudagrass.



Tuesday, October 18, 2011
Henry Gonzalez Convention Center, Hall C, Street Level

Kemin Su1, Justin Moss1, Guolong Zhang2, Yanqi Wu3 and Dennis Martin1, (1)Dept. of Horticulture and Landscape Architecture, Oklahoma State University, Stillwater, OK
(2)Animal Science, Oklahoma State University, Stillwater, OK
(3)Plant and Soil Science, Oklahoma State University, Stillwater, OK
Drought stress is a major limiting factor for warm-season turfgrasses to grow during summer in the U.S. transition zone. Genotypic variation in drought resistance exists among bermudagrasses [Cynodon dactylon (L.) Pers.], but the mechanisms of drought resistance are poorly understood. Our objectives were to quantitatively profile membrane lipid molecule species in three warm-season grasses under drought stress, discover relationships between specific lipid compositions and drought tolerance, and identify specific membrane lipid molecules as potential biomarkers for drought tolerance in bermudagrass. Grasses included a high drought resistance cultivar ‘Celebration', low drought resistance cultivar ‘Premier’, and a new released cultivar ‘Latitude 36’. The experiment was a completely randomized experimental design with two factors (three genotypes and two drought treatments) and five replications. To maintain well-watered conditions, 100% of water lost via evapotranspiration (ET) during the previous 3 d was replaced; Drought treatment was withholding irrigation until complete leaf wilting of most plants. The leaf samples were taken 2 times which include before treatment and dry treatment for 8 days. Total 60 dry lipid samples were analyzed by an automated electrospray ionization tandem mass spectrometry (ESI-MS/MS) approach.
See more from this Division: C05 Turfgrass Science
See more from this Session: Breeding, Genetics, and Stress Tolerance of Turfgrasses