Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/50664
標題: Role of antioxidative system in paraquat resistance of tall fleabane (Conyza sumatrensis)
作者: Chiang, Y.J.
王慶裕
Wu, Y.X.
Chiang, M.Y.
Wang, C.Y.
關鍵字: resistant biotype
antioxidant
glutathione cycle
canadensis l. cronq
superoxide-dismutase
hydrogen-peroxide
oxidative
stress
photooxidative stress
hordeum-glaucum
ascorbic-acid
pea-seedlings
higher-plants
nitric-oxide
期刊/報告no:: Weed Science, Volume 56, Issue 3, Page(s) 350-355.
摘要: In order to explore the physiological mechanism of paraquat resistance in tall fleabane, a widespread weed in Taiwan where resistance to this herbicide has been observed since 1980, the role of the antioxidative system was assessed. The susceptible (S) and resistant (R) biotypes of tall fleabane were distinguished clearly by the relative distribution frequency of injury index caused by 78 mu M paraquat. Although malondialdehyde, an indicator for peroxidation damage to the plant, in the the R-biotype was not changed, in the S-biotype malondialdehyde increased within 2 h after treatment of 50 mu M paraquat. Analysis of several antioxidants and pertinent enzymes revealed that ascorbate peroxidase activity was decreased by paraquat treatment in the S-biotype; and a lower basal level of ascorbate was present in the S-biotype as well. The maintenance of a high ratio of reduced glutathione to total glutathione, coupled with a pronounced and rapid increase of glutathione reductase (GR) activity in the the R-biotype, suggests that an active reduced glutathione/oxidized glutathione (GSH/ GSSG) cycle is critical to paraquat resistance of tall fleabane. The decisive contribution of a functional GSH/GSSG cycle to paraquat resistance through an enhancement of GR activity in this weed was further confirmed by an experiment of exogenous application of ascorbate.
URI: http://hdl.handle.net/11455/50664
ISSN: 0043-1745
文章連結: http://dx.doi.org/10.1614/ws-07-153.1
Appears in Collections:農藝學系

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