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Changes in activities of antioxidative system and monoterpene and photochemical efficiecny during seasonal leaf senescence in Hevea brasiliensis trees

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A variety of ecophysiological parameters were monitored in leaves of Hevea brasiliensis (rubber tree) during seasonal leaf senescence. Higher levels of hydrogen peroxide and malondialdehyde, and lower content of total protein and efficiency of photochemistry of photosystem II (PSII) were observed in the senescent leaves (SL) compared to the mature leaves (ML). A significant decrease in the contents of chlorophyll (Chl) and carotenoids (Car) in SL was also observed, but with increase in ratio of Car/Chl. Moreover, activities of superoxide dismutases, catalase, and glutathione reductase in SL were strongly suppressed. In contrast, the activities of guaiacol peroxidase (POD) and ascorbate peroxidase (APX), and the contents of reduced ascorbate, total ascorbate, reduced glutathione and total glutathione were considerably increased in SL compared to ML. In addition, α-pinene, β-pinene, sabinene and total monoterpene pool in SL were drastically decreased. Taken together, these results indicate that the enhanced activities of POD and APX, and further activation of ascorbateglutathione cycle conferred an important photoprotection against oxidative stress in senescent leaves of rubber trees. The increased Car/Chl could give the protection against photoxidation as well.
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  • Xishuangbanna Tropical Botanical Garden, The Chinese Academy of Sciences, Mengla, 666303 Yunnan, People's Republic of China
  • Graduate School of the Chinese Academy of Sciences, 100039 Beijing, People's Republic of China
  • Xishuangbanna Tropical Botanical Garden, The Chinese Academy of Sciences, Mengla, 666303 Yunnan, People's Republic of China
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