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Effects of Drought or Heat Stress Alone and in Combination on Kentucky Bluegrass

Dep. of Horticulture, Forestry, and Recreation Resources, 2021 Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS 66506 USA

View larger version (18K): [in a new window]   Fig. 1 Soil water content of Kentucky bluegrass exposed to drought (D), heat (H) and the combination of two stresses H+D at the 0- to 20- and 40- to 60-cm soil layers

View larger version (27K): [in a new window]   Fig. 2 Canopy photosynthetic rate (Pn) (A) and photochemical efficiency (Fv/Fm) (B) of Kentucky bluegrass under optimum temperature and well-watered conditions (control), drought (D), heat (H), and the combination of two stresses H+D. Vertical bars indicate LSD values for treatment comparisons at a given day of treatment. Arrows indicate when plants were rewatered

View larger version (13K): [in a new window]   Fig. 3 Root dry weight of Kentucky bluegrass under optimum temperature and well-watered conditions (control), drought (D), heat (H), and the combination of two stresses H+D in the 0- to 20-, 20- to 40-, and 40- to 60-cm soil layers at 25 d of D or H alone and 12 d of the combined stresses. Means followed by the same letters within each soil layer were not significantly different based on LSD test

View larger version (20K): [in a new window]   Fig. 4 Effects of drought preconditioning on canopy photosynthetic rate (Pn) (A) and photochemical efficiency (Fv/Fm) (B) of Kentucky bluegrass under subsequent heat stress. Pre+H, drought preconditioning under subsequent heat stress; Non+H, non-preconditioning under heat stress; Pre+D+H, drought preconditioning under the combination of drought and heat stresses; Non+H+D, non-preconditioning under the combination of drought and heat stresses. Vertical bars indicate LSD values for treatment comparisons at a given day of treatment