Agriculture Reference
In-Depth Information
Membrane
H 2 O 2
malondialdehyde
Phospholipid
peroxidase
Sensitive (Hoveizeh)
Tolerant (IRCTN 33)
Sensitive (Hovizeh)
High ascorbate
low ascorbate
High Chlorophyll
High Chlorophyll
Low malondialdehyde
High malondialdehyde
Less hydrogen peroxide
High hydrogen peroxide
Strong antioxidant mechanism
Weak antioxidant mechanism
Temperature acclimation results from a complex process
involving a number of physiological and biochemical changes,
including changes in membrane structure and function, tissue
water content, global gene expression, protein, lipid and primary
and secondary metabolite composition (Shinozaki and Dennis
2003). Recent advances in genome sequencing and global gene
expression analysis techniques have further established the
multigenic quality of environmental stress responses and the
complex nature of temperature acclimatization (Kreps et al.
2002).
Cold shock infl uenced metabolism profoundly, the steady
state pool sizes of 311 metabolites or mass spectral tags were
altered in response to cold shock. Increases in the pool sizes of
amino acids derived from pyruvate and oxaloacetate, polyamine
precursors, and compatible solutes were observed during cold
shock, known as signaling molecules and protectants (Kaplan
et al. 2004) (Fig. 22).
Signal perception is the fi rst step of plant response to
environmental stress. A stress sensor can detect environmental
variables and transmit the initial stress signals in cellular
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