Agriculture Reference
In-Depth Information
The second step of
•
OH formation is the Fenton reaction in which reduced form of iron
(Fe
2+
) transfers electrons to H
2
O
2
:
Fe
2+
+ H
2
O
2
→ Fe
3+
+ OH
−
+
•
OH
O
2
•−
can be also protonated to form HO
2
•
. Furthermore, O
2
•−
can react with another free radi‐
cal species as NO
•
to generate peroxynitrite (OONO
−
) [66]. Another form of ROS - singlet
oxygen is the first excited electron state of O
2
that originates when an electron is elevated to
a higher energy orbital (Figure 3).
Figure 2.
ROS production and programmed cell death induced by abiotic stress (according to Gill and Tuteja,
2010) [66].
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