The Activities of Antioxidant Enzymes in Response to Oxidative Stresses and Hormones in Paraquat-tolerant Rehmannia glutinosa Plants
Choi, D.G.(Jeollabuk-do Agricultural Research and Extension Service, Iksan, Republic of Korea) | Yoo, N.H.;Yun, S.J.(Chonbuk National University, Chonju, Republic of Korea)E-mail:sjyun@moak.chonbuk.ac.kr | Yu, C.Y.(Kangwon National University, Chunchon, Republic of Korea) | Reyes, Benildo de los(University of Maine, Orono, ME, USA)
All members of R. glutinosa show the unique characteristic of intrinsic tolerance to paraquat (PQ). Antioxidant enzymes have been proposed to be the primary mechanism of PQ resistance in several plant species. Therefore, the antioxidant enzyme systems of R. glutinosa were evaluated by comparatively analyzing cellular antioxidant enzyme levels, and their responses of oxidative stresses and hormones. The levels of ascorbate peroxidase (APX), glutathione reductase (GR), non-specific peroxidase (POX), and superoxide dismutase (SOD) were 7.3-, 4.9-, 2.7- and 1.6-fold higher in PQ-tolerant R. glutinosa than in PQ-susceptible soybeans.
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