Stomatal response to VPD is not triggered by changes in soil–leaf hydraulic conductance in Arabidopsis or Callitris
New Phytologist,
Journal Year:
2024,
Volume and Issue:
242(2), P. 444 - 452
Published: Feb. 23, 2024
Stomatal
closure
under
high
VPD
Language: Английский
Variation pattern in the macromolecular (cellulose, hemicelluloses, lignin) composition of cell walls in Pinus tabulaeformis tree trunks at different ages as revealed using multiple techniques
International Journal of Biological Macromolecules,
Journal Year:
2024,
Volume and Issue:
268, P. 131619 - 131619
Published: May 1, 2024
Language: Английский
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
Seasonal Shifts in Tree Water Use and Non‐Structural Carbohydrate Storage in a Tropical Dry Forest
Plant Cell & Environment,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 2, 2025
ABSTRACT
Predictions
of
increased
drought
frequency
and
intensity
have
the
potential
to
threaten
forest
globally.
The
key
trees
response
is
an
understanding
tree
water
use
carbohydrate
storage.
Our
objective
was
evaluate
sap
velocity
dynamics
non‐structural
carbohydrates
(NSC)
in
native
a
dry
tropical
forest,
during
rainy
periods.
We
evaluated
six
species
Caatinga:
three
deciduous
with
low
wood
density
(WD),
two
high
WD
one
evergreen
measured
velocity,
xylem
potential,
stomatal
conductance,
phenology
NSC.
found
that
specie
had
higher
frequent
NSC
production.
While
showed
store
mainly
stem
roots,
leaf
sprouting
flowering
at
end
period.
also
however,
stored
These
results
suggest
under
longer
seasons
irregular
seasons,
part
resprout
still
season
may
be
most
affected.
Language: Английский
Stress dose explains drought recovery in Norway spruce
Frontiers in Plant Science,
Journal Year:
2025,
Volume and Issue:
16
Published: March 6, 2025
Understanding
the
stress
recovery
of
trees,
particularly
with
respect
to
increasing
droughts
due
climate
change,
is
crucial.
An
often-overlooked
aspect
how
short
versus
long
drought
events
high
intensity
(i.e.,
low
and
dose)
result
in
damage
affect
post-stress
recovery.
This
study
examines
dynamics
3-year-old
Picea
abies
following
a
(n
=
5)
18
days
or
9)
51
during
late
summer.
We
assessed
canopy
conductance
tree
transpiration
linked
i)
terms
minimum
water
potential,
ii)
duration
inferred
by
below
potential
related
12%
hydraulic
loss
(dP12),
iii)
dose
cumulative
deficit
on
P12
(TWDP12)
as
well
(Ψcum),
iv)
percent
conductive
xylem
area
(PLA).
Both
treatments
resulted
stem
root
embolism
higher
PLA
49%
±
10%
treatment
compared
18%
6%
consistent
across
measured
plant
parts.
Suffering
from
leaf
shedding
(long
drought,
32%;
12%),
recovered
41%
3%
control
66%
4%
at
12
after
release.
These
rates
were
explained
observed
(R2
0.66)
dP12
0.62)
but
best
metrics,
TWDP12
0.88).
Our
highlights
that
should
be
integrated
assess
rates.
Here,
derived
point
dendrometers
appears
promising,
it
provides
non-destructive
temporal
resolution
dose.
Language: Английский
Sap flow through partially embolized xylem vessel networks
Plant Cell & Environment,
Journal Year:
2024,
Volume and Issue:
47(9), P. 3375 - 3392
Published: June 3, 2024
Abstract
Sap
is
transported
through
numerous
conduits
in
the
xylem
of
woody
plants
along
path
from
soil
to
leaves.
When
all
are
functional,
vessel
lumen
diameter
a
strong
predictor
hydraulic
conductivity.
As
vessels
become
embolized,
sap
movement
becomes
increasingly
affected
by
factors
operating
at
scales
beyond
individual
conduits,
creating
resistances
that
result
conductivity
diverging
diameter‐based
estimates.
These
effects
include
pit
resistances,
connectivity,
length,
network
topology,
and
or
sector
isolation.
The
impact
these
varies
with
level
distribution
emboli
within
network,
manifest
as
alterations
relationship
between
number
embolized
measured
declines
across
vulnerability
embolism
curves.
Divergences
estimates
reveal
functional
differences
arise
because
species‐
tissue‐specific
structures.
Such
divergences
not
uniform,
tissues
may
diverge
different
ways
differing
degrees.
Plants
regularly
operate
under
nonoptimal
conditions
contain
conduits.
Understanding
implications
function
partially
networks
critical
gaps
our
understanding
occurring
natural
environments.
Language: Английский
Enhanced drought resistance in tomato via reduced auxin sensitivity: delayed dehydration and improved leaf resistance to embolism
Physiologia Plantarum,
Journal Year:
2024,
Volume and Issue:
176(3)
Published: May 1, 2024
Abstract
Auxins
are
master
regulators
of
plant
development
and
auxin
perception
mutants
display
smaller
leaves,
lower
transpiration,
narrower
xylem
vessels
than
their
corresponding
wild
types.
Here,
we
evaluated
whether
the
leaf
embolism
resistance
overall
to
drought
altered
in
mutant
diageotropica
(
dgt
).
Our
assessments
demonstrate
that
tomato
exhibit
considerably
stems
(‐24%),
petioles
(‐43%),
midribs
(‐34%)
type.
Alongside
vessels,
exhibited
greater
cell
wall
thickness‐to‐conduit
diameter
The
water
potential
at
50%
cumulative
(P
50
)
type
was
‐1.39
‐1.14
MPa,
respectively.
Plants
also
higher
stomatal
safety
margin
(water
difference
between
closure
P
),
needed
a
longer
time
reach
dry‐down
experiment,
showed
faster
recovery
gas
exchange
upon
rehydration
impaired
signaling
resulted
canopy
area
conductance,
which
likely
contributed
delaying
for
plants
hydraulic
damage
during
drought.
These
findings
clear
association
structural
physiological
changes
improved
against
drought‐induced
dysfunction
mutant.
Language: Английский
Contrasting survival strategies for seedlings of two northern conifer species to extreme droughts and floods
Tree Physiology,
Journal Year:
2024,
Volume and Issue:
44(10)
Published: Sept. 8, 2024
Lowland
northern
white-cedar
(Thuja
occidentalis
L.)
forests
are
increasingly
exposed
to
extreme
droughts
and
floods
that
cause
tree
mortality.
However,
it
is
not
clear
the
extent
which
these
events
may
differentially
affect
regeneration
of
cedar
its
common
associate,
balsam
fir
(Abies
balsamea
(L.)
Mill.).
To
test
this,
we
measured
how
seedlings
were
able
avoid,
resist
recover
from
experimental
drought
flood
treatments
different
lengths
(8
66
days).
Overall,
found
exhibited
a
strategy
stress
resistance
growth
recovery
(resilience)
moderate
stress.
Fir,
on
other
hand,
appears
be
adapted
avoid
overall
lower
resilience.
In
treatments,
evidence
stomatal
behaviors.
Cedar
used
available
water
quickly
therefore
experienced
more
than
fir,
but
was
survive
at
potentials
>
3
MPa
below
key
hydraulic
thresholds.
On
employed
conservative
water-use
avoided
extremely
low
potential.
response
survival
higher
only
reached
50%
if
23.1
days
flooding
in
contrast
7.4
reach
mortality
for
fir.
both
floods,
many
stressed
maintain
partially
brown
canopies
often
survived
stress,
albeit
with
reduced
growth,
suggesting
contrast,
or
had
threshold-type
responses
they
either
full
live
little
effect
died
reliance
avoidance.
Combined
variable
precipitation
regimes,
seasonal
complex
microtopography
can
provide
safe
sites
forests,
results
inform
conservation
management
lowland
stands.
Language: Английский
Within‐leaf variation in embolism resistance is not a rule for compound‐leaved angiosperms
American Journal of Botany,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 16, 2024
Abstract
Premise
Hydraulic
segmentation,
caused
by
the
difference
in
embolism
resistance
across
plant
organs,
provides
a
sacrificial
layer
of
cheaper
like
leaves,
to
protect
more
costly
such
as
stems,
during
drought.
Within‐leaf
hydraulic
segmentation
has
been
observed
two
compound‐leaved
tree
species,
with
leaflets
being
vulnerable
than
rachis
or
petiole.
Many
herbaceous
species
have
compound
and
some
that
are
associated
pulvini
at
base
lamina,
which
could
provide
an
anatomical
means
preventing
from
spreading
within
leaf
because
higher
number
vessel
endings
pulvinus.
Methods
We
used
optical
vulnerability
method
investigate
whether
differences
were
tissues
six
one
deciduous
leaves.
Our
selection
included
both
palmately
pinnately‐compound
leaved
each
pulvinus
leaflets.
Results
found
considerable
variation
measured,
but
no
evidence
leaf.
In
pulvini,
we
major
events
crossing
pulvinus,
petiole
into
embolizing
same
water
potential.
Conclusions
conclude
within‐leaf
resistance,
is
not
universal
phenomenon
presence
does
barrier
spread
Language: Английский
Weak link or strong foundation? Vulnerability of fine root networks and stems to xylem embolism
New Phytologist,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 12, 2024
Resolving
the
position
of
roots
in
whole-plant
hierarchy
drought-induced
xylem
embolism
resistance
is
fundamental
for
predicting
when
species
become
isolated
from
soil
water
resources.
Published
research
generally
suggests
that
are
most
vulnerable
organ
plant
vascular
system,
although
estimates
vary
significantly.
However,
our
knowledge
root
excludes
fine
(<
2
mm
diameter)
form
bulk
total
absorptive
surface
area
network
and
nutrient
uptake.
We
measured
stem
vulnerability
10
major
land
clades
(five
angiosperms,
three
conifers,
a
fern
lycophyte),
using
standardised
situ
methods
(Optical
Methods
MicroCT).
Mean
across
matched
or
exceeded
stems
all
study
species.
In
six
these
(one
fern,
one
lycophyte,
conifers
angiosperm),
were
significantly
more
resistant
than
stems.
No
clear
relationship
was
found
between
conduit
diameter
vulnerability.
These
results
provide
insight
into
hydraulic
pathway
at
site
uptake,
challenge
long-standing
assumption
Language: Английский