The holocentric chromosome microevolution: From phylogeographic patterns to genomic associations with environmental gradients
Molecular Ecology,
Journal Year:
2023,
Volume and Issue:
33(24)
Published: Oct. 5, 2023
Geographic
isolation
and
chromosome
evolution
are
two
of
the
major
drivers
diversification
in
eukaryotes
general,
specifically,
plants.
On
one
hand,
range
shifts
induced
by
Pleistocene
glacial
oscillations
deeply
shaped
evolutionary
trajectories
species
Northern
Hemisphere.
other
karyotype
variability
within
or
complexes
may
have
adaptive
potential
as
different
karyotypes
represent
recombination
rates
linkage
groups
that
be
associated
with
locally
adapted
genes
supergenes.
Organisms
holocentric
chromosomes
ideal
to
study
link
between
local
adaptation
evolution,
due
their
high
cytogenetic
variability,
especially
when
it
seems
related
environmental
variation.
Here,
we
integrate
phylogeography,
chromosomal
ecological
requirements
a
plant
complex
distributed
Western
Euro-Mediterranean
region
(Carex
gr.
laevigata,
Cyperaceae).
We
aim
clarify
relative
influence
these
factors
on
population
differentiation
ultimately
speciation.
obtained
well-resolved
RADseq
phylogeny
sheds
light
phylogeographic
patterns
molecular
number
variation,
which
compatible
south-to-north
postglacial
migration.
In
addition,
landscape
genomics
analyses
identified
candidate
loci
for
adaptation,
also
strong
significant
associations
environment.
conclude
distribution
C.
laevigata
has
been
constrained
both
shift
dynamics
adaptation.
Our
demonstrates
responsible,
at
least
partially,
microevolutionary
Carex.
Language: Английский
Preface to the Special Issue on African Flora in a Changing World: Integrating multiple dimensions of diversity
Annals of Botany,
Journal Year:
2024,
Volume and Issue:
133(5-6), P. 643 - 648
Published: April 4, 2024
Africa
is
home
to
globally
important
biodiversity.Straddling
the
equator
and
extending
temperate
latitudes
(at
37°N
34°S;
not
including
oceanic
islands
such
as
Marion
Prince
Edward),
continent
accommodates
a
variety
of
ecosystems
biomes,
tropical
forests,
savanna
montane
grasslands,
deserts,
Mediterranean-type
(Olson
et
al.,
2011;Linder,
2014).The
has
remained
relatively
stable
in
Cenozoic
period
(66
2.5
million
years
ago,
Ma),
despite
dramatic
geological
events,
shifting
coastlines,
volcanism
formation
rift
valley
(Couvreur
2021).Africa
rich
diversity
vascular
plants,
with
over
65
000
species
recorded
on
its
surrounding
(Qian
2021).This
equates
approximately
18.5%
plant
(Antonelli
2023).However,
efforts
catalogue
African
composition
are
uneven,
certain
regions
(e.g.tropical
east
central
Africa)
being
well
catalogued
others
(e.g.Sudan)
barely
explored
(Marshal
2016).At
same
time,
increased
ecological
evolutionary
research
points
varied
patterns
diversification
assembly
flora;
however,
there
lack
wider
consolidation
disparate
knowledge.This
Special
Issue
aims
bring
together
pan-African
build
holistic
synthesis
knowledge
ecology
evolution
plants.
Language: Английский
Macroevolutionary inference of complex modes of chromosomal speciation in a cosmopolitan plant lineage
New Phytologist,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 25, 2024
The
effects
of
single
chromosome
number
change-dysploidy
-
mediating
diversification
remain
poorly
understood.
Dysploidy
modifies
recombination
rates,
linkage,
or
reproductive
isolation,
especially
for
one-fifth
all
eukaryote
lineages
with
holocentric
chromosomes.
on
have
not
been
estimated
because
modeling
numbers
linked
to
heterogeneity
along
phylogenies
is
quantitatively
challenging.
We
propose
a
new
state-dependent
model
evolution
that
links
rates
dysploidy
considering
and
differentiates
between
anagenetic
cladogenetic
changes.
apply
this
Carex
(Cyperaceae),
cosmopolitan
flowering
plant
clade
recover
two
distinct
modes
chromosomal
speciation
in
Carex.
In
one
mode,
occurs
frequently
drives
faster
rates.
the
other
rare,
driven
by
hidden,
unmeasured
factors.
When
we
use
excludes
hidden
states,
mistakenly
infer
strong,
uniformly
positive
effect
diversification,
showing
standard
models
may
lead
confident
but
incorrect
conclusions
about
diversification.
This
study
demonstrates
can
significant
role
large
despite
presence
factors
simultaneously
affect
Language: Английский