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Journal of Environmental BiologypISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP |
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Abstract - Issue Jul 2010, 31 (4) BackDrought stress induced changes in lipid peroxidation and
antioxidant system in genus Avena Indian
Grassland and Fodder Research Institute, (Received: Abstract: Seven species of genus Avena viz., Avena sativa, Avena strigosa, Avena brevis, Avena
vaviloviana, Avena abyssinica, Avena marocana and Avena sterilis were used to study the impact of drought stress on
lipid peroxidation and other antioxidant enzymes.
Maximum increase in the catalase activity was
recorded in A. vaviloviana (129.97%) followed by A.
sativa (122.82%) and A. brevis (83.38%) at vegetative
stage; however at flowering stage the maximum increase was reported in A.
sativa (25.62%) followed by A. sterilis (20.46%) and
A. brevis (18.53%). At vegetative stage drought,
maximum increase in peroxidase activity was recorded
in A. sativa (122.82%) followed by A. brevis (83.38%)
and A. sterilis (49.78%). Flowering stage drought,
showed maximum increase in A. sativa (27.09%) followed by A. marocana (23.50%) and A. sterilis
(20.46%). A. sativa and A. sterilis showed stress
tolerance at both the stages by accumulating higher percentage of peroxidase followed by A. brevis
at vegetative and A. marocana at flowering stage.
Level of lipid peroxidation in terms of Malondialdehyde (MDA) content was increased in the leaves
when plants were subjected to moisture stress. The rate of increase in lipid peroxidation occurs irrespective of stage however; maximum
increase was recorded in A. strigosa at both the
stages. Avena species which showed high level of MDA
content, indicates more lipid peroxidation and more
membrane permeability and are comparatively more susceptible for water stress
than those which produce less Malondialdehyde (MDA)
content at higher magnitude of water stress such species have better capability
for moisture stress tolerance. Key
words: Drought, Antioxidant
system, Lipid peroxidation, Avena
sativa ??????? PDF of full length paper
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