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Supraoptimal Soil Temperatures Induced Oxidative Stress in Leaves of Creeping Bentgrass Cultivars Differing in Heat Tolerance

^a Dep. of Plant Science, Foran Hall, 59 Dudley Rd., Rutgers Univ., New Brunswick, NJ 08901
^b Dep. of Horticulture, Forestry, and Recreation Resources, Kansas State Univ., Manhattan, KS 66506-5506

View larger version (25K): [in a new window]   Fig. 1. Turf visual quality of two creeping bentgrass cultivars, L-93 (solid line and symbol) and Penncross (dotted line and open symbol), in response to differential air/soil temperature. Vertical bars indicate LSD values (P = 0.05) for treatment and cultivar comparisons at a given day

View larger version (25K): [in a new window]   Fig. 2. Leaf photochemical efficiencies (Fv/Fm) of two creeping bentgrass cultivars, L-93 (solid line and symbol) and Penncross (dotted line and open symbol), in response to differential air/soil temperature. Vertical bars indicate LSD values (P = 0.05) for treatment and cultivar comparisons at a given day

View larger version (25K): [in a new window]   Fig. 3. Cell membrane permeability expressed as electrolyte leakage of two creeping bentgrass cultivars, L-93 (solid line and symbol) and Penncross (dotted line and open symbol), in response to differential air/soil temperature. Vertical bars indicate LSD values (P = 0.05) for treatment and cultivar comparisons at a given day

View larger version (25K): [in a new window]   Fig. 4. Superoxide dismutase activity in leaves of two creeping bentgrass cultivars, L-93 (solid line and symbol) and Penncross (dotted line and open symbol), in response to differential air/soil temperature. Vertical bars indicate LSD values (P = 0.05) for treatment and cultivar comparisons at a given day

View larger version (26K): [in a new window]   Fig. 5. Catalase activity in leaves of two creeping bentgrass cultivars, L-93 (solid line and symbol) and Penncross (dotted line and open symbol), in response to differential air/soil temperature. Vertical bars indicate LSD values (P = 0.05) for treatment and cultivar comparisons at a given day

View larger version (25K): [in a new window]   Fig. 6. Lipid peroxidation expressed as malondialdehyde content in leaves of two creeping bentgrass cultivars, L-93 (solid line and symbol) and Penncross (dotted line and open symbol), in response to differential air/soil temperature. Vertical bars indicate LSD values (P = 0.05) for treatment and cultivar comparisons at a given day