Effects of soil water stress on the antioxidant system in leaves of tea plants (Camellia sinensis)
The two-year-old seedlings of tea plants (Camellia sinensis cv. Tieguanyin and C. sinensis cv. Fudingdabaicha) were grown in pots to study the effects of soil water stress on the antioxidant system. There were four soil water stress treatments: 75% (normal water supply) , 55% (slightly water stress), 35% (mild water stress) and20% (severe water stress) of field water-holding capacity. The results showed that the producing velocity of O-2 , cell membrane permeability and content of malondialdehyde (MDA) increased in both of cultivars' leaves under soil water stress; and the activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) , ascorbate peroxidase (APX) and glutathione reductase (GR) increased in the leaves of Tieguanyin under slightly stress and mild stress, but decreased under severe stress. The content of ascorbic acid (AsA) and glutathione (GSH) in leaves had the same profiles as the enzyme activities. But in leaves of Fudingdabaicha, the enzyme activities, the content of ascorbic acid (AsA) and glutathione (GSH) increased under slightly stress, while decreased under mild stress and severe stress. Compared with Fudingdabaicha, Tieguanyin presents higher antioxidant capacity, indicating that Tieguanyin has higher capacity to acclimate to different soil water supply than Fudingdabaicha grown under the same habitat.
tea plant (Camellia sinensis)soil water stressprotect enzymesantioxidantactive oxygen species
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