Title: Antioxidant system in two ecotypes of reed (Phragmites communis) leaves from different habitats
Abstract:Using plants possessing stable genetic tolerance/resistance under natural environmental conditions to study the mechanism of plants' adaptation to environmental stress are very significant. However, r...Using plants possessing stable genetic tolerance/resistance under natural environmental conditions to study the mechanism of plants' adaptation to environmental stress are very significant. However, relevant work is very limited. In this work, two ecotypes of reed (Phragmites communis Trin.), referred to as swamp reed (SR) and heavy salt meadow reed (HSMR) according to their habitats, growing in Pingchuan Town, Linze County, Gansu Province (China) were investigated for the antioxidant system in their leaves. The results showed that compared with the SR, there were no accumulations of reactive oxygen species and MDA (malondialdehyde) in the HSMR. The activities of SOD (superoxide dismutase), CAT (catalase), POD (peroxidase) and APX (ascorbate peroxidase) were significantly higher in the HSMR than those in the SR. There were no differences in the contents of total ascorbic acid and carotenoids between the two ecotypes, while the contents of reduced ascorbic acid and total glutathione were higher in the HSMR than that in the SR. Moreover, the LOX (lipoxygenase) in the HSMR showed a decreased activity compared with the SR. These results suggested that more efficient antioxidant systems in the HSMR contribute to its tolerance / resistance to the saline stress. In addition, higher activities of membrane-bound Ca~(2+)- and Mg~(2+)-ATPase in the HSMR might contribute to transporting excessive ions out of cells, therefore avoiding ion toxicity when this reed ecotype grew in saline habitat.Read More
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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Cited By Count: 2
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