2. Effect of grain moisture content
• The sequence of changes in
grain water content and
distribution has become a
relatively efficient parameter in
the characterization of grain
development
• often employed in the
determination of physiological
maturity
• Thus, grain moisture content
is affected by harvesting time
and grain moisture content at
storage
• Preliminary research shows
that cell wall composition and
polysaccharide structure could
modulate water diffusion
3. • There was a strong
correlation between
the thickness of
aleurone cell wall
and absorption rate
of water.
• However, there was
no correlation
between the
thickness of bran
and diffusion and
distribution of
water.
• It is showed in
difference of aleurone
layer thickness of
wheat, barley, and
highland barley
Effect of grain moisture content
5. • the water content in the grains decreased with an
increase in the thickness of aleurone
Effect of grain moisture content
6. • There was a strong correlation
between the water absorption
and desorption rates and the
thickness of the cell walls.
• The water absorption and
desorption rates decreased with
an increase in the thickness of
the cell walls.
• So, the thickness of aleurone
cell wall affect water
absorption and desorption of
grain and finally affect grain
moisture content
Effect of grain moisture content
7. • High temperature and
drought stress can
terminate grain filling
early, thus it decreases
the grain quality and yield
• The thicker aleurone cell
wall responds to high
temperature and drought
stress by slowing the
diffusion of water and
maintaining a higher
water content
Effect of grain moisture content
8. Is good to have thick aleurone
layer cell wall?
• higher water mobility
within grains with thicker
cell walls was due to the
higher porosity of grains.
but,
• higher water mobility
within grains with thicker
aleurone cell walls was
not because of the higher
proportion of aleurone cell
walls
9. • Grain maturation is
associated with numerous
biochemical and
physiological changes in
tissues, along with the
dehydration process.
• The metabolic processes
such as enzymatic
reactions, and ion
transportation and
accumulation occur in the
cytosol of living tissues,
where water is considered
to play a vital role in their
physiological activities
Effect of grain moisture content
