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• W2029809059 abstract "Myrothamnus flabellifolia, a short woody shrub from southern Africa, can survive severe desiccation of its vegetative organs. We studied mechanisms protecting this plant from oxidative damage during desiccation for 2 weeks, 4 and 8 months, and also during subsequent rehydration. This plant retains high concentrations of chlorophyll during desiccation, and these chlorophyll molecules are probably a source for potentially harmful singlet oxygen production. Desiccation triggered substantial increases in zeaxanthin and redox shifts of the antioxidants glutathione and ascorbate towards their oxidised forms. Simultaneously, the concentrations of violaxanthin, beta-carotene, ascorbate, alpha-tocopherol, and glutathione reductase activity progressively decreased. Antheraxanthin, gamma-tocopherol, lutein, neoxanthin and glucose-6-phosphate dehydrogenase displayed less pronounced changes in response to desiccation. Even after 4 months of desiccation, Myrothamnus flabellifolia recovered rapidly upon rehydration. Re-watering induced formation of ascorbate and glutathione, simultaneous reduction of their oxidised forms, and rapid production of alpha-tocopherol and of various carotenoids. Only after 8 months of desiccation did the antioxidant system of M. flabellifolia break down; 3 weeks after the onset of rehydration, these plants abscised their leaves, but even then they were still able to recover and develop new ones. Ascorbate, beta-carotene and alpha-tocopherol were totally depleted after 8 months of desiccation and did not recover upon rehydration; glutathione was partly maintained, but only in the oxidised form. We present a model demonstrating which parts of antioxidant pathways break down as oxidative stress becomes detrimental and we discuss some potential implications of our results for the genetic modification of crop plants to improve their drought tolerance." @default.
• W2029809059 created "2016-06-24" @default.
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• W2029809059 date "2002-07-01" @default.
• W2029809059 modified "2023-10-14" @default.
• W2029809059 title "Revival of a resurrection plant correlates with its antioxidant status" @default.
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• W2029809059 doi "https://doi.org/10.1046/j.1365-313x.2002.01329.x" @default.
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