Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: Dec. 28, 2024
The
quality
of
cigar
tobacco
leaves
is
profoundly
affected
by
the
timing
their
harvest,
with
both
early
and
late
collections
resulting
in
inferior
characteristics.
While
relationship
between
maturity
physiological
metabolic
processes
acknowledged,
a
comprehensive
understanding
behavior
harvested
at
different
stages
remains
elusive.
This
research
investigated
metabolomic
profiles
variety
CX-014,
grown
Danjiangkou
City,
Hubei
Province,
sampled
35
(T1),
42
(T2),
49
(T3),
56
(T4)
days
post-inflorescence
removal.
Leaf
color
transitioned
from
green
to
yellow,
accompanied
appearance
white
mature
spots.
Notable
increases
photosynthetic
pigments
gas
exchange
parameters
occurred
T1
T2,
followed
decline
T3
T4.
optimal
sugar-to-nicotine
potassium-to-chlorine
ratios,
critical
determinants
smoking
combustibility,
were
observed
T3,
indicating
superior
chemical
balance
this
stage.
Metabolomic
analysis
revealed
2153
distinct
metabolites,
most
significant
changes
occurring
T2
highlighting
transformations
during
interval.
Pathway
enrichment
via
KEGG
pinpointed
notable
shifts
amino
acid
synthesis
pathways,
particularly
those
involving
tryptophan,
alanine,
aspartate.
Tryptophan
metabolism
zeatin
biosynthesis
substantially
altered,
compounds
like
indolepyruvic
acid,
N-formylpurine
nucleotide,
isopentenyladenine
dihydrozeatin
showing
marked
reductions
T3.
study
also
explored
how
lower
leaf
harvest
influences
middle
leaves,
finding
that
plethora
metabolites
associated
breakdown
arachidonic
acid—a
primitive
metazoan
signaler
implicated
plant
stress
defense
networks—were
abundant
when
43–38
prior.
Overall,
these
findings
elucidates
complex
dynamics
maturation,
involved
essential
pathways.
International Journal of Molecular Sciences,
Journal Year:
2024,
Volume and Issue:
25(6), P. 3550 - 3550
Published: March 21, 2024
Melatonin
is
a
ubiquitous
regulator
in
plants
and
performs
variety
of
physiological
roles,
including
resistance
to
abiotic
stress,
regulation
growth
development,
enhancement
plant
immunity.
exhibits
the
characteristics
phytohormone
with
its
pleiotropic
effects,
biosynthesis,
conjugation,
catabolism,
effective
concentration,
shape
location
dose-response
curves.
In
addition,
CAND2/PMTR1,
phytomelatonin
receptor
candidate
belonging
G
protein-coupled
receptors
(GPCRs),
supports
concept
melatonin
as
phytohormone.
However,
biochemistry
needs
be
further
characterized.
particular,
some
experimental
findings
date
cannot
explained
by
known
GPCR
signaling
mechanisms,
so
studies
are
needed
explore
possibility
novel
mechanisms.
Plants,
Journal Year:
2024,
Volume and Issue:
13(18), P. 2590 - 2590
Published: Sept. 16, 2024
Melatonin
(MT)
is
considered
as
an
antistress
molecule
that
plays
a
constructive
role
in
the
acclimation
of
plants
to
both
biotic
and
abiotic
stress
conditions.
In
present
study,
we
assessed
impact
10
100
μM
MT
foliar
spray,
on
chlorophyll
content,
photosystem
II
(PSII)
function,
under
moderate
drought
stress,
oregano
(Origanum
vulgare
L.)
plants.
Our
aim
was
elucidate
molecular
mechanism
action
photosynthetic
electron
transport
process.
Foliar
spray
with
more
effective
mitigating
negative
PSII
compared
MT.
significantly
improved
reduced
efficiency
oxygen-evolving
complex
(OEC),
photoinhibition
(Fv/Fm),
which
were
caused
by
stress.
Under
MT,
water
sprayed
(WA)
leaves,
increased
non-photochemical
quenching
(NPQ)
31%,
at
growth
irradiance
(GI,
205
μmol
photons
m−2
s−1),
13%
high
(HI,
1000
s−1).
However,
lower
NPQ
increase
HI
demonstrated
be
decreasing
singlet-excited
oxygen
(1O2)
production
(−38%),
drought-stressed
than
corresponding
decrease
1O2
GI
(−20%),
respective
WA-sprayed
leaves
drought.
The
resulted
significant
quantum
yield
photochemistry
(ΦPSII),
rate
(ETR),
plants,
but
only
(+27%).
results
suggest
enhancement
functionality,
initiated
mechanism,
decreased
fraction
open
reaction
centers
(qp),
resulting
ETR.
Plant Stress,
Journal Year:
2023,
Volume and Issue:
10, P. 100293 - 100293
Published: Nov. 15, 2023
Abiotic
stress
adversely
affects
the
metabolism
and
growth
of
plants,
hampering
their
yield
productivity.
Melatonin
is
a
ubiquitous,
multifunctional,
regulatory,
non-toxic
potential
bio
stimulator
possessing
pleiotropic
effects
in
plant
kingdom.
It
master
regulator
which
plays
critical
role
under
abiotic
conditions.
Studies
indicate
increases
endogenous
levels
melatonin
plants.
On
other
hand,
exogenous
has
also
been
reported
to
mitigate
plants
by
modulating
proteins
gene
expressions.
Melatonin-mediated
reactive
oxygen
species
scavenging
defense
system
activation
are
primary
mechanisms
employed
make
alleviating
stress.
This
review
summarizes
recent
research
concerning
phytomelatonin
biosynthesis,
its
detection
techniques,
We
have
focused
on
regulatory
drought,
heat,
cold,
heavy
metal,
acid
rain,
toxic
chemical,
light,
herbicide
Additionally,
crosstalk
with
phytohormones
considered.
Plants,
Journal Year:
2023,
Volume and Issue:
12(23), P. 4025 - 4025
Published: Nov. 29, 2023
Melatonin
(MT)
is
considered
a
new
plant
hormone
having
universal
distribution
from
prokaryotic
bacteria
to
higher
plants.
It
has
been
characterized
as
an
antistress
molecule
playing
positive
role
in
the
acclimation
of
plants
stress
conditions,
but
its
impact
on
under
non-stressed
conditions
not
well
understood.
In
current
research,
we
evaluated
MT
application
(10
and
100
μM)
photosystem
II
(PSII)
function,
reactive
oxygen
species
(ROS)
generation,
chlorophyll
content
mint
(Mentha
spicata
L.)
order
elucidate
molecular
mechanism
action
photosynthetic
electron
transport
process
that
still
unclear.
Seventy-two
hours
after
foliar
spray
with
μM
MT,
improved
imported
amount
light
energy
capture,
which
caused
6%
increase
quantum
yield
PSII
photochemistry
(ΦPSII)
rate
(ETR).
Nevertheless,
reduced
efficiency
oxygen-evolving
complex
(OEC),
causing
donor-side
photoinhibition,
simultaneous
slight
ROS.
Even
so,
decreased
excess
excitation
at
implying
superior
efficiency.
The
pressure
PSII,
spray,
suggests
induced
stomatal
closure
through
ROS
production.
response
ΦPSII
corresponds
J-shaped
hormetic
curve,
enhancement
by
MT.
suggested
stimulation
functionality
was
triggered
non-photochemical
quenching
(NPQ)
stimulated
production,
enhanced
function.
concluded
molecules
can
be
used
both
biostimulants
for
enhancing
crop
yields.
