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Osmotic Adjustment and Root Growth Associated with Drought Preconditioning-Enhanced Heat Tolerance in Kentucky Bluegrass

^a Department of Horticulture, Forestry, and Recreational Resources, Kansas State University, Manhattan, KS 66506-5506
^b Department of Plant Science, Rutgers University, New Brunswick, NJ 08903

View larger version (15K): [in a new window]   Fig. 1. Turf quality (A) and leaf relative water content (B) as affected by heat stress in drought-preconditioned and nonpreconditioned Kentucky bluegrass. Vertical bars indicate LSD values (P = 0.05) for treatment comparisons at a given day of treatment. The dotted line indicates the acceptable level of turf quality (6).

View larger version (42K): [in a new window]   Fig. 2. Osmotic adjustment as affected by heat stress in drought-preconditioned and nonpreconditioned Kentucky bluegrass. Means followed by the same letters within a column at a given day of heat stress treatment were not significantly different based on LSD test (P = 0.05).

View larger version (16K): [in a new window]   Fig. 3. Leaf water soluble carbohydrate content (A) and proline content (B) as affected by heat stress in drought-preconditioned and nonpreconditioned Kentucky bluegrass. Vertical bars indicate LSD values (P = 0.05) for treatment comparisons at a given day of treatment.