Measurement and analysis of drought resistance in Poa pratensis cv. Hybrid

American Hybrid Bluegrass (Poa pratensis cv. Hybrid) is a highquality turfgrass newly introduced from America as high drought resistance, strong cold duration, slow growth rate, fast adaptability and normal reproduction in China. Relative holding water, free proline, malondialdehyde and soluble carbohydrate of the turfgrass were determined after establishment of turfgrass, compared with Park bluegrass (P. pratensis cv. Park), Saber Bluegrass (P. pratensis cv. Saber), Bugby Bluegrass (P. pratensis cv. Bugby), Farway Perennial Ryegrass (Lolium perenne cv. Farway), Legend Red fescue (Festuca rubra cv. Legend) and Houndog (F. arundinacea cv. Houndog). Relative holding water (85.56%) and malondialdehyde (MDA) (0.002 5 mol/g) were lowest (P0.01), and free proline (81.563 4 g/g) and soluble carbohydrate (4.506 3%) were highest (P0.01). This indicates that drought tolerance of American Hybrid Bluegrass was the highest.