Agriculture Reference
In-Depth Information
used as a potential biomarker for sub-lethal metal toxicity in examined plant spe-
cies (Radotic et al.
2000
). In plants, the detoxification of H
2
O
2
has been known
to be an important function of the peroxidases that use ascorbate as the hydrogen
donor (Hegedus et al.
2001
). The induction of APX activity in plants has also been
reported under chromium stress (Diwan et al.
2010a
; Hegedus et al.
2001
). Among
H
2
O
2
destroying enzymes, APX activity was found to increase in roots and leaves
of the chromium treated plants (Shah et al.
2001
). The increase in the activity of
APX levels could be the consequence of either the microenvironment or the tissue
specific gene expression in the treated plants (Hegedus et al.
2001
). Increase in APX
activity suggested a role of APX in the detoxification of H
2
O
2
and its up-regulation
under chromium-induced oxidative stress as established earlier with reference to
many other heavy metals (Diwan et al.
2008
; Qureshi et al.
2005
; Israr et al.
2006
;
Khan et al.
2009
). Importance of APX as a limiting factor of defense against photo-
oxidative stress has been confirmed in transgenic tobacco plants (Rizhsky et al.
2002
; Yabuta et al.
2002
).
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