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Effects of Abscisic Acid on Antioxidant Systems of Stylosanthes guianensis (Aublet) Sw. under Chilling Stress

^a College of Life Science, South China Agricultural Univ., Guangzhou 510642, China
^b College of Horticulture, South China Agricultural Univ., Guangzhou 510642, China

View larger version (26K): [in a new window]   Fig. 1. Electrolyte leakage in leaves of S. guianensis as affected by ABA under chilling condition. Each data point is the mean of four samples. Each sample was taken from one pot and measured three times. Different letters indicate statistical difference at P 0.05 level. A or B represents two separate experiments.

View larger version (19K): [in a new window]   Fig. 2. Electrolyte leakage in leaves of water- and ABA-treated S. guianensis as affected by chilling. Each data point is the mean of three samples. Each sample was taken from 3 pots and measured three times. Vertical bars indicate LSD values (P = 0.05) for treatment comparisons at a given day. A or B represents two separate experiments. indicates the point of rewarming.

View larger version (19K): [in a new window]   Fig. 3. Relative water contents in leaves of water- and ABA-treated S. guianensis as affected by chilling. Each data point is the mean of three samples. Each sample was taken from three pots and measured three times. Vertical bars indicate LSD values (P = 0.05) for treatment comparisons at a given day. A or B represents two separate experiments. indicates the point of rewarming.

View larger version (21K): [in a new window]   Fig. 4. Superoxide dismutase (SOD) activities in leaves of water- and ABA-treated S. guianensis as affected by chilling. Each data point is the mean of three samples. Each sample was taken from three pots and measured three times. Vertical bars indicate LSD values (P = 0.05) for treatment comparisons at a given day. A or B represents two separate experiments. indicates the point of rewarming.

View larger version (22K): [in a new window]   Fig. 5. Catalase (CAT) activities in leaves of water- and ABA-treated S. guianensis as affected by chilling. Each data point is the mean of three samples. Each sample was taken from three pots and measured three times. Vertical bars indicate LSD values (P = 0.05) for treatment comparisons at a given day. A or B represents two separate experiments. indicates the point of rewarming.

View larger version (22K): [in a new window]   Fig. 6. Ascorbate peroxidase (APX) activities in leaves of water- and ABA-treated S. guianensis as affected by chilling. Each data point is the mean of three samples. Each sample was taken from three pots and measured three times. Vertical bars indicate LSD values (P = 0.05) for treatment comparisons at a given day. A or B represents two separate experiments. indicates the point of rewarming.

View larger version (21K): [in a new window]   Fig. 7. Reduced glutathione (GSH) contents in leaves of water- and ABA-treated S. guianensis as affected by chilling. Each data point is the mean of three samples. Each sample was taken from three pots and measured three times. Vertical bars indicate LSD values (P = 0.05) for treatment comparisons at a given day. A or B represents two separate experiments. indicates the point of rewarming.

View larger version (21K): [in a new window]   Fig. 8. Ascorbic acid (AsA) contents in leaves of water- and ABA-treated S. guianensis as affected by chilling. Each data point is the mean of three samples. Each sample was taken from three pots and measured three times. Vertical bars indicate LSD values (P = 0.05) for treatment comparisons at a given day. A or B represents two separate experiments. indicates the point of rewarming.