Long‐Term in vivo Observation of Maize Leaf Xylem Embolism, Transpiration and Photosynthesis During Drought and Recovery
Plant Cell & Environment,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 3, 2025
ABSTRACT
Plant
water
transport
is
essential
to
maintain
turgor,
photosynthesis
and
growth.
Water
transported
in
a
metastable
state
under
large
negative
pressures,
which
can
result
embolism,
that
is,
the
loss
of
function
by
replacement
liquid
xylem
sap
with
gas,
as
consequence
stress.
To
avoid
experimental
artefacts,
we
used
an
optical
vulnerability
system
quantify
embolism
occurrence
across
six
fully
expanded
maize
leaves
characterize
sequence
physiological
responses
(photosynthesis,
chlorophyll
fluorescence,
whole‐plant
transpiration
leaf
inter‐vein
distance)
relation
declining
availability
during
severe
Additionally,
recovery
presence
sustained
6‐day
period.
Embolism
formation
occurred
after
other
processes
were
substantially
depressed
irreversible
upon
rewatering.
Recovery
transpiration,
net
CO
2
assimilation
photosystem
II
efficiency
aligned
severity
whereas
these
traits
returned
near
pre‐stress
levels
absence
embolism.
A
better
understanding
relationships
between
downstream
stress
critical
for
improvement
crop
productivity
resilience.
Language: Английский
Channel deformations during elastocapillary spreading of gaseous embolisms in biomimetic leaves
Interface Focus,
Journal Year:
2025,
Volume and Issue:
15(2)
Published: May 16, 2025
The
nucleation
and/or
spreading
of
bubbles
in
water
under
tension
(due
to
evaporation)
can
be
problematic
for
most
plants
along
the
ascending
sap
network-from
roots
leaves-called
xylem.
Due
global
warming,
trees
facing
drought
conditions
are
particularly
threatened
by
formation
such
embolisms,
which
hinders
flow
and
ultimately
fatal.
Polydimethylsiloxane
(PDMS)-based
biomimetic
leaves
simulating
evapotranspiration
have
demonstrated
that,
a
linear
configuration,
existence
slender
constriction
channel
allows
creation
intermittent
embolism
propagation
(as
an
interaction
between
elasticity
leaf
capillary
forces
at
air/water
interfaces)
(Keiser
et
al.
2022
J.
Fluid
Mech.
948,
A52
(doi:10.1017/jfm.2022.733);
Keiser
2024
R.
Soc.
Interface
21,
20240103
(doi:10.1098/rsif.2024.0103)).
Here,
we
use
analogue
PDMS-based
one
dimension
two
dimensions.
To
better
explore
mechanism,
add
setup
additional
technique,
allowing
measure
directly
microchannel's
ceiling
deformation
versus
time,
corresponds
pressure
variations.
We
present
here
method
that
quantitative
insights
into
dynamics
spreading.
coupling
deformations
Laplace
threshold
explains
observed
elastocapillary
dynamics.
Language: Английский