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The Oxidative Burst |
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SCN: SCN Basics
SCN Invasion (pictures!
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Elicitor molecules from bacteria
and fungi trigger a plant defense response called the oxidative burst, which
involves the production of reactive oxygen species (ROS), super oxide and
hydrogen peroxide. It is possible that a plant resistance (R) gene may
detect the presence of the pathogen and trigger the production of ROS
through a signaling process that may include an increase in cytosolic Ca2+,
H+, and aromatic monoamines such as catecholamines, phenylethylamine, tyramine,
dopamine and other structurally related compounds. Two models involving plasma membrane
NADH oxidase, cell wall peroxidase, and copper amine oxidase
have been proposed to account for ROS production. It is likely that
peroxisomes are also involved, because they appear to produce large
quantities of ROS.
Ref. K.A.Blee et al. (2001) Plant Molecular Biology 47: 607-620 T.Kawano et al. (2000) Plant Cell Physiol 41(11):1259-1266 |