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Drought and Heat Stress Injury to Two Cool-Season Turfgrasses in Relation to Antioxidant Metabolism and Lipid Peroxidation

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

View larger version (20K): [in a new window]   Fig. 1. Turf quality as effected by drought (D), heat (H), and the combined stresses (D+H) in tall fescue and Kentucky bluegrass. Vertical bars indicate LSD values (P = 0.05) for treatment comparison at a given day of treatment

View larger version (21K): [in a new window]   Fig. 2. Relative water content (RWC) as effect by drought (D), heat (H), and the combined stresses (D+H) in tall fescue and Kentucky bluegrass. Vertical bars indicate LSD values (P = 0.05) for treatment comparison at a given day of treatment

View larger version (23K): [in a new window]   Fig. 3. Chlorophyll content (Chl) as affected by drought (D), heat (H), and the combined stresses (D+H) in tall fescue and Kentucky bluegrass. Vertical bars indicate LSD values (P = 0.05) for treatment comparison at a given day of treatment

View larger version (20K): [in a new window]   Fig. 4. Changes in SOD activity in tall fescue and Kentucky bluegrass in responses to drought (D), heat (H), and the combined stresses (D+H). Vertical bars indicate LSD values (P = 0.05) for treatment comparison at a given day of treatment

View larger version (21K): [in a new window]   Fig. 5. Changes in AP activity in tall fescue and Kentucky bluegrass in responses to drought (D), heat (H), and the combined stresses (D+H). Vertical bars indicate LSD values (P = 0.05) for treatment comparison at a given day of treatment

View larger version (21K): [in a new window]   Fig. 6. Changes in GR activity in tall fescue and Kentucky bluegrass in responses to drought (D), heat (H), and the combined stresses (D+H). Vertical bars indicate LSD values (P = 0.05) for treatment comparison at a given day of treatment

View larger version (21K): [in a new window]   Fig. 7. Changes in CAT activity in tall fescue and Kentucky bluegrass in responses to drought (D), heat (H), and the combined stresses (D+H). Vertical bars indicate LSD values (P = 0.05) for treatment comparison at a given day of treatment

View larger version (20K): [in a new window]   Fig. 8. Lipid perioxidation indicated by MDA content as affected by drought (D), heat (H), and the combined stresses (D+H) in tall fescue and Kentucky bluegrass. Vertical bars indicate LSD values (P = 0.05) for treatment comparison at a given day of treatment