Research Square (Research Square),
Journal Year:
2023,
Volume and Issue:
unknown
Published: May 23, 2023
Abstract
Aims
To
test
a
hypothesis
that
fallen
leaf
litter
results
in
the
continuous
cropping
obstacle
(CCO)
Cynanchum
auriculatum
Royle
ex
Wight
(
CA
)
via
growth
promotion
and
invasion
reinforcement
of
soil-borne
fungal
pathogen.
Methods
Water
extracts
(LE)
root
(RE)
were
compared
for
their
effects
on
seed
germination,
seedling
indices,
plant
defense
enzymes
activities.
Besides,
impacts
LE
pathogen
investigated
under
laboratory
conditions
following
isolation
verification.
Then,
soil
microbial
communities
determined
by
using
high-throughput
sequencing
technology.
Key
Results
A
strain
D1
belonging
to
Fusarium
solani
causing
rot
disease
was
isolated
confirmed
its
potential
contribution
CCO.
Both
RE
inhibited
growth,
Extracts
especially
coupled
with
aggravated
impacts.
Apart
from
induction
propagation
soil,
could
also
promote
hypha
weight,
spore
number,
germination
rate
culture
conditions.
Compared
RE,
showed
more
promoting-effects
pathogenesis-related
activities
D1.
Moreover,
caffeic
acid
ferulic
possible
active
substances
contributing
events.
not
bacterial
but
community
shifted
LE+D1.
Conclusions
These
suggested
water
extract
promoted
D1,
enhanced
pathogenicity
towards
,
which
synthetically
contributed
CCO
process.
Agronomy,
Journal Year:
2025,
Volume and Issue:
15(2), P. 486 - 486
Published: Feb. 18, 2025
Panax
notoginseng
is
a
prominent
traditional
Chinese
medicinal
herb,
yet
its
yield
and
quality
are
significantly
constrained
by
continuous
cropping
obstacles,
primarily
stemming
from
soil-related
issues.
This
study
analyzed
soils
subjected
to
various
degrees
of
P.
cultivation,
without
planting,
natural
forest
floor
soil
planting.
The
objective
was
investigate
variations
in
microbial
communities,
physicochemical
properties,
enzyme
activities
across
different
conditions.
Macro-genome
sequencing
employed
reveal
shifts
key
factors
influencing
rhizosphere
communities.
Notably,
the
exhibited
highest
levels
organic
matter,
carbon,
total
nitrogen,
available
potassium.
Furthermore,
showed
pH,
phosphorus,
electrical
conductivity,
catalase,
urease,
acid
phosphatase,
sucrase,
FDA
hydrolase
decreased
after
cropping,
but
increased
again
five
years
fallowing.
Microbial
analysis
revealed
that
Bacteroidetes,
Firmicutes,
Chloroflexi
dominated
whereas
Proteobacteria,
Actinobacteria,
Acidobacteria
were
predominant
phyla
soils.
Continuous
led
an
increase
Acidobacteria,
Gemmatimonadetes,
Chloroflexi,
while
fallowing
reduced
Actinobacteria.
Gemmatimonades
almost
exclusively
present
Overall,
planting
altered
nutrients
composition.
Key
communities
included
nitrate
potassium,
conductivity.
suggests
attention
should
be
paid
scientific
rational
fertilization
practices
mitigate
effects
cropping.
Additionally,
fallow
period
more
than
recommended.
proper
application
probiotic
fertilizers
also
advised.
Finally,
cultivating
under
conditions
recommended
as
viable
method.
Frontiers in Microbiology,
Journal Year:
2024,
Volume and Issue:
15
Published: Feb. 13, 2024
Introduction
Continuous
cropping
affected
the
stability
of
soil
enzyme
activity
and
structural
characteristics
microbial
community.
Owing
to
challenges
in
study
complex
rhizosphere
communities,
composition
function
these
communities
farmland
ecosystems
remain
elusive.
Here,
we
studied
wine
grapes
with
different
years
continuous
investigated
their
relationships
activity.
Methods
Metagenomic
sequencing
was
conducted
on
soils
from
one
uncultivated
wasteland
four
vineyards
varying
durations
cropping.
Results
The
predominant
were
bacteria
(98.39%),
followed
by
archaea
(1.15%)
eukaryotes
(0.45%).
caused
a
significant
increase
relative
abundance
Rhizobiales
Micrococcales
but
marked
decrease
Solirubrobacterales
.
At
genus
level,
75,
88,
65,
132,
128
genera
unique
wasteland,
5,
10,
15,
20
cropping,
respectively.
genes
signal
transduction
highest.
all
enzymes
measured
this
peaked
at
5
then
decreased
10
15
year
increased
again.
In
addition,
activity,
especially
alkaline
phosphatase
significantly
correlated
diversity
dominant
microorganisms
level.
Moreover,
coupled
activities
had
greater
impact
community
than
that
individual
enzymes.
Conclusion
Our
findings
reveal
response
changes
years,
which
has
important
implications
for
overcoming
obstacles
optimizing
land
use.
Agronomy,
Journal Year:
2023,
Volume and Issue:
13(2), P. 471 - 471
Published: Feb. 5, 2023
Coffee
is
one
of
the
most
valuable
agricultural
commodities
worldwide,
second
only
to
oil
in
terms
international
trade.
Coffea
arabica
L.
a
widely
cultivated
and
economically
important
crop
that
responsible
for
about
90%
global
production
coffee.
In
this
study,
we
selected
five
C.
cultivation
sites
at
different
altitudes
clarify
effects
altitude
on
rhizospheric
soil
physical–chemical
characteristics
microbial
communities.
The
samples
collected
low
were
more
nutrient-deficient
acidic
than
medium–high
altitudes.
Proteobacteria-to-Acidobacteria
ratio
increased
from
lower
Additionally,
although
Ascomycota
was
dominant
fungal
phylum,
it
unaffected
by
altitude.
Furthermore,
alpha
richness
diversity
bacterial
communities
higher
Moreover,
redundancy
analysis
indicated
phyla
closely
associated
with
pH.
These
findings
suggest
should
be
altitudes,
which
conducive
sustainable
management
high-quality
beans.
Heliyon,
Journal Year:
2024,
Volume and Issue:
10(4), P. e26078 - e26078
Published: Feb. 1, 2024
Continuous
planting
is
unavoidable
in
agricultural
production,
but
continuous
affects
plant
growth
and
physiological
characteristics.
In
this
study,
we
analyzed
rhizosphere
soil
nutrients,
characteristics,
hormone
metabolome
changes
their
interactions
of
Casuarina
equisetifolia
(C.
equisetifolia)
with
the
increase
number.
The
results
found
that
C.
root
was
significantly
inhibited,
height
dwarfed
biomass
reduced
as
number
increased.
Secondly,
caused
a
decrease
nutrient
transformation
capacity,
significant
total
available
content.
Analysis
indexes
showed
resulted
nitrogen,
phosphorus,
potassium
content,
activity
resistance,
photosynthetic
capacity
leaves.
Hormone
analysis
critically
affected
accumulation
five
characteristic
hormones
leaves,
which
salicylic
acid
2-O-β-glucoside
(SAG),
2-oxindole-3-acetic
(OxIAA),
trans-zeatin-O-glucoside
(tZOG)
gibberellin
A3
(GA3)
content
decreased
while
abscisic
(ABA)
increased
significantly.
conclusion,
lowered
equisetifolia,
inhibited
growth,
hindered
uptake
transportation
by
root,
thus
led
to
leaves
SAG,
OxIAA,
tZOG,
GA3
synthesis
ability
decreased,
ABA
accumulated
large
quantities,
resistance
photosynthesis
impeded.
This
study
provides
insights
for
effective
management
cultivation
equisetifolia.
