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Cytokinin Effects on Creeping Bentgrass Response to Heat Stress

II. Leaf Senescence and Antioxidant Metabolism

^a Dep. of Botany and Microbiology, Univ. of Oklahoma, Norman, OK 73019
^b Dep. of Plant Science, Rutgers University, New Brunswick, NJ 08901

View larger version (32K): [in a new window]   Fig. 1. Cell membrane integrity expressed as EL in leaves of creeping bentgrass as affected by applications of exogenous zeatin riboside (ZR) at 0 d (A, C) and 14 d (B, D) of high soil temperature (20/35°C, A, B) and high air/soil temperatures (35/35°C, C, D). Vertical bars indicate LSD values (P = 0.05) for temperature and ZR concentration comparisons at a given day.

View larger version (33K): [in a new window]   Fig. 2. Leaf chlorophyll content of creeping bentgrass as affected by exogenous applications of zeatin riboside (ZR) at 0 d (A, C) and 14 d (B, D) of high soil temperature (20/35°C, A, B) and high air/soil temperatures (35/35°C, C, D). Vertical bars indicate LSD values (P = 0.05) for temperature and ZR concentration comparisons at a given day.

View larger version (29K): [in a new window]   Fig. 3. Superoxide dismutase activities in leaves of creeping bentgrass as affected by exogenous applications of zeatin riboside (ZR) at 0 d (A, C) and 14 d (B, D) of high soil temperature (20/35°C, A, B) and high air/soil temperatures (35/35°C, C, D). Vertical bars indicate LSD values (P = 0.05) for temperature and ZR concentration comparisons at a given day.

View larger version (31K): [in a new window]   Fig. 4. Catalase activities in leaves of creeping bentgrass as affected by exogenous applications of zeatin riboside (ZR) at 0 d (A, C) and 14 d (B, D) of high soil temperature (20/35°C, A, B) and high air/soil temperatures (35/35°C, C, D). Vertical bars indicate LSD values (P = 0.05) for temperature and ZR concentration comparisons at a given day.

View larger version (29K): [in a new window]   Fig. 5. Malonyldidehyde (MDA) contents in leaves of creeping bentgrass as affected by exogenous applications of zeatin riboside (ZR) at 0 d (A, C) and 14 d (B, D) of high soil temperature (20/35°C, A, B) and high air/soil temperatures (35/35°C, C, D). Vertical bars indicate LSD values (P = 0.05) for temperature and ZR concentration comparisons at a given day.