Effects of γ-aminobutyric Acid on Photosynthetic Pigment Contents and Antioxidant Enzyme Activities of Camptotheca acuminata Seedlings under Cadmium Stress
In order to improve resistance of Camptotheca acuminata to cadmium (Cd) stress and provide refer-ences for cultivation of C. acuminata in Cd-polluted areas, pot experiment was conducted to investigate effects of γ-aminobutyric acid (GABA) on photosynthetic pigment contents and antioxidant enzyme activities of C. acu-minata seedlings under Cd stress. Results showed that Cd treatment (1 mg/L) decreased contents of chlorophyll a, chlorophyll b and carotenoid and activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) of C. acuminata seedlings. Contents of chlorophyll a, chlorophyll b and carotenoid and activities of SOD, CAT and POD of C. acuminata seedlings showed increasing trends with increase of GABA concentration under Cd stress, and maxima were observed at GABA concentration of 2 mmol/L. Correlation analysis showed that photosynthetic pigment contents and antioxidant enzyme activities had extremely positive correlations with ap-plication of GABA under Cd stress. GABA was able to improve resistance of C. acuminata seedlings under Cd stress and alleviate toxic effects of Cd stress on C. acuminata seedlings.
Cd stressγ-aminobutyric acidphysiological characteristicCamptotheca acuminata
万方数据
维普
