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Effects of Trinexapac-Ethyl Foliar Application on Creeping Bentgrass Responses to Combined Drought and Heat Stress

Dep. of Plant Biology, Cook College, Rutgers Univ., New Brunswick, NJ 08901-8520

View larger version (13K): [in this window] [in a new window]   Figure 1. Effects of foliar application of trinexapac-ethyl (TE) on turf quality during combined heat and drought stress (stress). Turf quality was expressed on a scale of 1 to 9 based on turf color, density, and uniformity. Unconnected symbols on the right are data for recovery (Rec.) following rewatering. Vertical bars indicate LSD values (P = 0.05) for treatment comparisons at a given day of treatment.

View larger version (13K): [in this window] [in a new window]   Figure 2. Effects of foliar application of trinexapac-ethyl (TE) on relative water content (RWC) during combined heat and drought stress (stress). Unconnected symbols on the right are data for recovery (Rec.) following rewatering. Vertical bars indicate LSD values (P = 0.05) for treatment comparisons at a given day of treatment.

View larger version (15K): [in this window] [in a new window]   Figure 3. Changes in soil volumetric water content (%) in treatments with or without trinexapac-ethyl (TE) during combined heat and drought stress (stress). Unconnected symbols on the right are data for recovery (Rec.) following rewatering. Vertical bars indicate LSD values (P = 0.05) for comparison of changes over treatment period.

View larger version (10K): [in this window] [in a new window]   Figure 4. Changes in vertical shoot growth in treatments with or without trinexapac-ethyl (TE) during combined heat and drought stress (stress). Vertical bars indicate LSD values (P = 0.05) for comparison of changes over the treatment period.

View larger version (14K): [in this window] [in a new window]   Figure 5. Effects of foliar application of trinexapac-ethyl (TE) on canopy photosynthesis rate (Pn) (CO2 mmol m–2 s–1) during combined heat and drought stress (stress). Columns with the same lowercase letters were not significantly different at a given day of treatment based on LSD values (P = 0.05).

View larger version (13K): [in this window] [in a new window]   Figure 6. Effects of foliar application of trinexapac-ethyl (TE) on canopy evapotranspiration (ET) (H2O mmol m–2 s–1) during combined heat and drought stress (stress). Columns with the same lowercase letters were not significantly different at a given day of treatment based on LSD values (P = 0.05).

View larger version (15K): [in this window] [in a new window]   Figure 7. Changes in photochemical efficiency (Fv/Fm) in treatments with or without trinexapac-ethyl (TE) during combined heat and drought stress (stress). Unconnected symbols on the right are data for recovery (Rec.) following rewatering. Vertical bars indicate LSD values (P = 0.05) for comparison of changes over treatment period.

View larger version (22K): [in this window] [in a new window]   Figure 8. Effects of foliar application of trinexapac-ethyl (TE) on leaf chlorophyll content (mg g–1 of dry weight [dwt]) during combined heat and drought stress (stress). Columns with the same lowercase letters were not significantly different at a given day of treatment based on LSD values (P = 0.05).

View larger version (22K): [in this window] [in a new window]   Figure 9. Effects of foliar application of trinexapac-ethyl (TE) on total nonstructural carbohydrates (TNC) (mg g–1 of dry leaf tissue [dwt]) during combined heat and drought stress (stress). Columns with the same lowercase letters were not significantly different at a given day of treatment based on LSD values (P = 0.05).