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Books > Science & Mathematics > Biology, life sciences > Botany & plant sciences > Plant physiology
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Reactive Oxygen Species in Plant Signaling (Hardcover, 2009 ed.)
Loot Price: R4,257
Discovery Miles 42 570
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Reactive Oxygen Species in Plant Signaling (Hardcover, 2009 ed.)
Series: Signaling and Communication in Plants
Expected to ship within 10 - 15 working days
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Oxygen (O ) appeared in significant amounts in the Earth's
atmosphere over 2. 2 2 billion years ago, largely due to the
evolution of photosynthesis by cyanobacteria (Halliwell 2006). The
O molecule is a free radical, as it has two impaired electrons 2
that have the same spin quantum number. This spin restriction makes
O prefer to 2 accept its electrons one at a time, leading to the
generation of the so-called reactive oxygen species (ROS). The
chemical nature of these species dictates that they can create
damage in cells. This has contributed to the creation of the
"oxidative stress" concept; in this view, ROS are unavoidable toxic
products of O metabolism and 2 aerobic organisms have evolved
antioxidant defences to protect against this tox- ity (Halliwell
1981; Fridovich 1998). Indeed, even in present-day plants, which
are full of antioxidants, much of the protein synthetic activity of
chloroplasts is used to replace oxidatively damaged D1 and other
proteins (Halliwell 2006). Yet, the use of the "oxidative stress"
term implies that ROS exert their effects through indiscriminate
widespread inactivation of cellular functions. In this context, ROS
must not be able to react with lipids, proteins or nucleic acids in
order to avoid any damage to vital cellular components. However,
genetic evidence has suggested that, in planta, purely physicoche-
cal damage may be more limited than previously thought (Foyer and
Noctor 2005).
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