Agriculture Reference
In-Depth Information
to target the cellular membrane and thus is the primary cause
of other metabolic disorders usually observed within the cells
(Lyons 1973). ABA, reduced ROS (Reactive oxygen species)
production in imbibed rice seeds, specially in embryo region
are known, such reduced ROS also led to an inhibition of ASC
(ascorbic acid) production GA
3
(Gibberellin) accumulation
was also suppressed by a reduced ROS and ASC level, which
was indicated by the inhibited expression of GA
3
biosynthesis
genes, amylase genes and enzyme activity (Zhang et al. 2012)
(Fig. 10).
Escape of solutes
Enhanced ABA
Reduced ROS
Incomplete plasma
membrane
Disturbance in
reconstruction of
membrane
Semisolid gel
membrane
Inhibition of ASC
production
Cold
temperature
Stress in Seed
Retarded Water
diffusion &
imbibition
Inhibition of GA3
synthesis
Unbalance
metabolic and
enzymetic activities
Seed Germination
poor or failure
Fig. 10
Mechanism of cold effect on Germination.
