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Effects of Salicylic Acid on Heat Tolerance Associated with Antioxidant Metabolism in Kentucky Bluegrass

^a College of Agriculture and Biology, Shanghai Jiaotong Univ., Shanghai 201101, China
^b Agricultural College, Nanjing Agricultural Univ., Nanjing 210095
^c Dep. of Plant Science, Cook College, Rutgers Univ., New Brunswick, NJ 08901-8520

View larger version (14K): [in a new window]   Fig. 1. Water content in shoots of Kentucky bluegrass at 12 h of heat stress as influenced by salicylic acid (SA) application. FW = fresh weight. Bars represent standard errors of means (n = 4). Columns with different letters indicate a significant difference at P = 0.05.

View larger version (16K): [in a new window]   Fig. 2. Superoxide anion generation rate in shoots of Kentucky bluegrass as influenced by salicylic acid (SA) and heat stress duration. DW = dry weight. Bars represent standard errors of means (n = 4). Columns with different letters indicate a significant difference at P = 0.05.

View larger version (17K): [in a new window]   Fig. 3. Superoxide dismutase (SOD) activity in shoots of Kentucky bluegrass as influenced by salicylic acid (SA) and heat stress duration. DW = dry weight. Bars represent standard errors of means (n = 4). Columns with different letters indicate a significant difference at P = 0.05.

View larger version (17K): [in a new window]   Fig. 4. Hydrogen superoxide (H2O2) levels in the shoots of Kentucky bluegrass as influenced by salicylic acid (SA) and heat stress duration. DW = dry weight. Bars on the lines are standard errors of means (n = 4) and different letters indicate a significant difference at P = 0.05.

View larger version (14K): [in a new window]   Fig. 5. Catalase (CAT) activity in shoots of Kentucky bluegrass as influenced by salicylic acid (SA) and heat stress duration. DW = dry weight. Bars on the lines are standard errors of means (n = 4) and different letters indicate a significant difference at P = 0.05.