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Gas Exchange and Leaf Anatomy of Andropogon Gerardii Ecotypes over a Climatic Gradient of the...
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Gas Exchange and Leaf Anatomy of Andropogon Gerardii Ecotypes over a Climatic Gradient of the Great Plains
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3233.pdf
Description
Author
Olsen
,
Jacob
T
.
Title
Gas
Exchange
and
Leaf
Anatomy
of
Andropogon
Gerardii
Ecotypes
over
a
Climatic
Gradient
of the
Great
Plains
Degree Program
Biology
Subject keywords
Andropogon
gerardii
,
big
bluestem
,
drought
adaptation
,
leaf
anatomy
,
photosynthesis
,
sand
bluestem
;
Abstract
"The
phenotype
of
two
Andropogon
gerardii
subspecies
,
big
bluestem
and
sand
bluestem
,
varies
broadly
throughout
the
Great
Plains
of
North
America
,
giving
rise
to
ecotypes
within
the
species
. This
study
sought
to
discriminate
between
genetic
and
environmental
variation
of
big
bluestem
and
sand
bluestem
by
examining
gas
exchange
and
leaf
anatomy
in
common
gardens
across
a
climatic
gradient
of the
Great
Plains
.
Thirteen
populations
of
big
bluestem
and
one
population
of
sand
bluestem
,
constituting
five
ecotypes
, were
planted
in
community
plots
and a
single
plant
plots
in a
common
garden
at
each
of
four
sites
ranging
from
western
Kansas
to
southern
Illinois
.
Photosynthesis
,
stomatal
conductance
,
intercellular
CO2
,
transpiration
, and
intrinsic
water
use
efficiency
were
measured
three
times
in the
2010
growing
season
. In
addition
,
leaf
thickness
,
midrib
thickness
,
bulliform
cells
,
interveinal
distance
, and
vein
size
were
assessed
by
light
microscopy
.
Abundant
phenotypic
variation
exists
among
ecotypes
within
community
plots
. At
all
planting
sites
,
big
bluestem
ecotypes
from
xeric
environments
had
higher
photosynthesis
,
stomatal
conductance
, and
transpiration
compared
to
mesic
ecotypes
.
Single
plant
plots
also had
abundant
phenotypic
variation
;
ecotypes
native
to
xeric
environments
also had
higher
photosynthesis
,
stomatal
conductance
, and
transpiration
, but
differences
were
more
distinct
. In
addition
,
sand
bluestem
,
which
was
only
planted
in
single
plant
plots
, had
similar
photosynthesis
,
stomatal
conductance
, and
transpiration
to the
big
bluestem
ecotype
native
to the
most
xeric
environment
.
Sand
bluestem
also had
higher
water
use
efficiency
and
lower
intercellular
CO2
than any
big
bluestem
ecotype
.
Leaf
anatomy
assessments
indicated
xeric
ecotypes
of A.
gerardii
had
thicker
leaves
and
fewer
bulliform
cells
.
Environmental
variation
was as
important
as
genetic
variation
for
gas
exchange
and
leaf
anatomy
in
both
community
and
single
plant
plots
.
Compared
to
xeric
sites
,
mesic
sites
had
higher
photosynthesis
,
stomatal
conductance
, and
water
use
efficiency
and
lower
intercellular
CO2
and
transpiration
in
community
and
single
plant
plots
.
Leaves
from
mesic
sites
also had
thicker
midribs
,
larger
veins
, and a
greater
proportion
of
bulliform
cells
.
Ecotypes
of A.
gerardii
across
the
Great
Plains
are
adapted
to
water
availability
.
Drought-adapted
ecotypes
of A.
gerardii
were
shorter
in
stature
and had
smaller
,
thicker
,
narrower
leaves
,
which
reduced
the
evaporative
surface
area
of these
plants
.
Evidently
, A.
gerardii
controls
water
loss
by
reducing
evaporative
surface
area
more
than
it
does
by
increasing
the
proportion
of
bulliform
cells
. This
allows
drought-adapted
ecotypes
to have
higher
photosynthetic
rates
,
stomatal
conductances
, and
transpiration
rates
in
both
mesic
and
xeric
environments
compared
to
ecotypes
native
to
mesic
environments
. This
study
brings
to
light
potential
responses
of
big
bluestem
ecotypes
to
climate
change
. This
study
also
indicates
the
phenotypic
variation
among
big
bluestem
could
prove
useful
in the
restoration
of
native
prairies.
"
Date Original
2012-04
Publisher
Fort Hays State University
Relation
Digital reproduction of the Fort Hays State University Theses Collection.
Type
Text
Format
application/pdf
Identifier
OlsenJake_2012
Source
LD2652 .T5 B5 O473 2012
Language
eng
Relation-Requires
Adobe Reader is required to view this item. Download at
http://get.adobe.com/reader/.
Rights
Copyright 2012 Jacob T. Olsen
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