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Antioxidant Metabolism in Cotton Seedlings Exposed to Temperature Stress in the Field

USDA-ARS, Plant Stress and Water Conservation Lab., 3810 4th St, Lubbock, TX 79415

View larger version (35K): [in a new window]   Fig. 1. Air temperatures measured over the interval 14 May to 23 June 2003 (a) and 2004 (b) at Lubbock, TX. Average temperature for 15-min intervals was measured with a thermocouple. Horizontal lines at 15°C and 33°C indicate thresholds for low and high temperature stresses.

View larger version (31K): [in a new window]   Fig. 2. Levels of malondialdehyde (nmol g–1 fresh wt.) in cotton tissues from early planting (DOY 113) in 2003 and late plantings (DOY 133) in 2003 and 2004 at Lubbock, TX. Each data point represents a minimum of 3 samples. Error bars indicate standard error of the mean.

View larger version (31K): [in a new window]   Fig. 3. Levels of glutathione (µg gfw–1) in cotton tissues from late plantings (DOY 133) in 2003 (a) and 2004 (b) at Lubbock, TX. Bar increments indicate amount of oxidized and reduced glutathione and the total pool size is represented by the aggregate of the two. Each data point represents a minimum of three samples. Error bars indicate standard error of the mean.

View larger version (29K): [in a new window]   Fig. 4. Activity of glutathione reductase (units gfw–1) in cotton tissues from early planting (DOY 113) in 2003 and late plantings (DOY 133) in 2003 and 2004 at Lubbock, TX. A unit of activity is the amount of enzyme that will catalyze the reduction of 1 µmol of GSSG per min at 25°C. Each data point represents a minimum of three samples. Error bars indicate standard error of the mean.

View larger version (29K): [in a new window]   Fig. 5. Activity of ascorbate peroxidase (units gfw–1) in cotton tissues from early planting (DOY 113) in 2003 and late plantings (DOY 133) in 2003 and 2004 at Lubbock, TX. A unit of ascorbate peroxidase is defined as the amount necessary to oxidize 1 µmole of ascorbate per minute at 25°C (290-nm extinction coeffcient = 2.8 mM–1 cm–1). Each data point represents a minimum of three samples. Error bars indicate standard error of the mean.