Environmental Science & Technology,
Год журнала:
2023,
Номер
58(1), С. 510 - 521
Опубликована: Дек. 15, 2023
Fluorinated
liquid
crystal
monomers
(FLCMs)
have
been
suggested
as
emerging
contaminants,
raising
global
concern
due
to
their
frequent
occurrence,
potential
toxic
effects,
and
endurance
capacity
in
the
environment.
However,
environmental
fate
of
FLCMs
remains
unknown.
To
fill
this
knowledge
gap,
we
investigated
aerobic
microbial
transformation
mechanisms
an
important
FLCM,
4-[difluoro(3,4,5-trifluorophenoxy)methyl]-3,
5-difluoro-4′-propylbiphenyl
(DTMDPB),
using
enrichment
culture
termed
BG1.
Our
findings
revealed
that
67.5
±
2.1%
initially
added
DTMDPB
was
transformed
10
days
under
optimal
conditions.
A
total
14
products
obtained
a
series
reactions
(e.g.,
reductive
defluorination,
ether
bond
cleavage,
demethylation,
oxidative
hydroxylation
aromatic
ring
opening,
sulfonation,
glucuronidation,
O-methylation,
thiolation)
were
identified.
Consortium
BG1
harbored
essential
genes
could
transform
DTMDPB,
such
dehalogenation-related
[e.g.,
glutathione
S-transferase
gene
(GST),
2-haloacid
dehalogenase
(2-HAD),
nrdB,
nuoC,
nuoD];
hydroxylating-related
hcaC,
ubiH,
COQ7;
opening-related
ligB
catE;
methyltransferase
ubiE
ubiG.
Two
DTMDPB-degrading
strains
isolated,
which
are
affiliated
with
genus
Sphingopyxis
Agromyces.
This
study
provides
novel
insight
into
FLCMs.
The
implications
for
development
bioremediation
strategies
aimed
at
addressing
sites
contaminated
Environment International,
Год журнала:
2025,
Номер
201, С. 109553 - 109553
Опубликована: Май 27, 2025
Phthalate
esters
(PAEs)
were
ubiquitous
in
agricultural
soils
and
could
be
metabolized
after
being
absorbed
by
crops,
posing
significant
implications
for
crop
yield
quality.
We
hypothesize
that
monophthalates
(mPAEs),
the
hydrolyzed
products
of
PAEs,
might
mimic
phytohormone
jasmonic
acid
(JA)
to
activate
JA
signaling
pathway,
therefore
enhancing
defense
towards
pests
inhibiting
rice
plant
growth.
Taking
dibutyl
phthalate
(DBP)
as
a
representative
PAE,
our
study
discovered
DBP
exposure
significantly
induced
JA-related
outcomes
including
decreased
larval
weight
(9.58-18.8%),
biomass
(11.7-34.2%).
Under
conditions
where
content
remained
unchanged,
monobutyl
(MBP),
product
DBP,
triggered
evidenced
upregulated
genes
encoding
coronatine
insensitive
1
(COI1)
(1.56-1.73
fold),
jasmonate
ZIM-domain
(JAZ)
(4.33-7.71
MYC2
transcription
factor
(2.07-2.87
promoted
phytoalexins
production
downstream
signaling.
MBP
conjugated
with
isoleucine,
conjugate
subsequently
mimicked
bioactivator
(JA-isoleucine
conjugate)
occupy
binding
site
COI1-JAZ
co-receptor
protein,
thereby
initiating
pathway.
These
mechanism
consistently
exposed
other
four
typical
aliphatic
chain
length
selected
PAEs
indicated
negative
contribution
these
observations.
In
this
study,
we
unconventional
through
which
transformation
metabolites
elicit
pest
while
simultaneously
growth,
providing
insights
into
risk
assessment
on
yields
