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Seasonal Patterns of Glutathione and Ascorbate Metabolism in Field-Grown Cotton under Water Stress

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

View larger version (20K): [in this window] [in a new window]   Fig. 1. Temporal distribution and amount of rain and irrigation during the experimental interval in 1996 and 1997. DOY = day of year.

View larger version (23K): [in this window] [in a new window]   Fig. 2. Leaf water potential measured in three water treatments during 1997. Measurements were made between 1400 and 1500 h. Values are means of a minimum of three leaves. DOY = day of year.

View larger version (43K): [in this window] [in a new window]   Fig. 3. Amount and form of glutathione in cotton during the 1996 growing season in Lubbock, TX. Glutathione was extracted from leaves collected between 0800 and 0830 h. The fourth expanded leaf below the apex was used in all samples. Error bars indicate the standard error of the mean. DOY = day of year.

View larger version (105K): [in this window] [in a new window]   Fig. 4. Amount and form of glutathione in cotton during the 1997 growing season in Lubbock, TX. Glutathione was extracted from leaves collected between 0800 and 0830 h. The fourth expanded leaf below the apex was used in all samples. Error bars indicate the standard error of the mean. DOY = day of year.

View larger version (83K): [in this window] [in a new window]   Fig. 5. Activity of glutathione reductase in leaves of cotton grown at three water levels during 1997 in Lubbock, TX. Glutathione reductase was extracted from leaves collected between 0800 and 0830 h. The fourth expanded leaf below the apex was used in all samples. Error bars indicate standard error of the mean. DOY = day of year.

View larger version (76K): [in this window] [in a new window]   Fig. 6. Activity of ascorbate peroxidase in leaves of cotton grown at three water levels during 1997 in Lubbock, TX. Ascorbate peroxidase was extracted from leaves collected between 0800 and 0830 h. The fourth expanded leaf below the apex was used for all samples. Error bars indicate standard error of the mean. DOY = day of year.

View larger version (74K): [in this window] [in a new window]   Fig. 7. Amount of ascorbate in leaves of cotton grown at three water levels during 1997 in Lubbock, TX. Ascorbate was extracted was extracted from leaves collected between 0800 and 0830 h. The fourth expanded leaf below the apex was used in all samples. Error bars indicate the standard error of the mean. DOY = day of year.

View larger version (104K): [in this window] [in a new window]   Fig. 8. Amount of malondialdehyde in cotton during the 1997 growing season in Lubbock, TX. Malondialdehyde was extracted from leaves collected between 0800 and 0830 h. The fourth expanded leaf below the apex was used for all samples. Error bars indicate the standard error of the mean. DOY = day of year.