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Pollination plan B: the floral phenology and mechanism of delayed selfing in jaltomata...
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Pollination plan B: the floral phenology and mechanism of delayed selfing in jaltomata repandidentata (solanaceae)
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1083.pdf
Description
Identifier
Thesis
1898
Author
Powell, John G.
Title
Pollination
plan
B
: the
floral
phenology
and
mechanism
of
delayed
selfing
in
jaltomata
repandidentata
(solanaceae)
Publisher
Central Connecticut State University
Date of Publication
2007
Resource Type
Master's Thesis
Abstract
Jaltomata
repandidentata
,
similar
to
other
members
of its
genus
,
is
known
to be
self-compatible
. The
following
study
identifies
J
.
repandidentata
as a
species
capable
of
delayed
self-pollination
and
describes
the
mechanism
of
delayed
selfing
through
changes
in
floral
morphology
during
anthesis
. This
work
was
accomplished
through
monitoring
changes
in
flower
phenology
and
quantifying
delayed
selfing
success
through
a
series
of
pollination
experiments
. On the
first
day
of
flowering
,
flowers
are
pistillate
and
anthers
remain
undehisced
. The
stigmatic
surface
is
functionally
receptive
throughout
anthesis
,
indicating
that
J
.
repandidentata
is
able
to
import
pollen
during
its
pistillate
phase
.
Elongation
of
stamen
filaments
and the
pistil
occur
over
a
two-day
flowering
period
.
Flowers
become
hermaphroditic
on the
second
day
, and
anthers
on
long
filaments
dehisce
earlier
than
anthers
on
short
filaments
at this
time
.
Prior
to
corolla
abscission
,
anthers
collapse
onto the
stigma
, and
self-pollination
is
achieved
.
Therefore
,
temporary
herkagomy
and
dichogamy
are
demonstrated
in the
species
,
which
prevents
premature
self-pollination
while
promoting
outcrossing
prior
to
selfing
.
No
significant
difference
was
found
between
the
lengths
of
short
stamens
and
pistils
, and this
proximity
allows
for
self
pollination
by
short
stamens
rather
than
long
stamens
,
whose
pollen
is
more
likely
to be
exported
than
used
in
self-pollination
.
Delayed
selfing
may
be
further
promoted
through
diurnal
changes
in
flower
opening
size
during
anthesis
,
extensive
filament
bending
that
occurs
during
the
final
hours
of
flowering
, and
pollinator
visitation
. A
high
success
of
self
pollination
was
demonstrated
in
bagged
flowers
of
various
accessions
of
J
.
repandidentata
, and a
significant
difference
in
self-pollination
success
was
seen
when
compared
to
Jaltomata
procumbens
,
another
species
with
similar
floral
phenology
.
Evidence
indicates
that
J
.
procumbens
as
well
as
other
Jaltomata
species
are also
likely
to
carry
out
delayed
selfing
.
Ecological
and
evolutionary
ramifications
of
delayed
selfing
in
J
.
repandidentata
are
discussed
, as
well
as
recommendations
for
further
research
.
Subject
Solanaceae -- Phenology
Department
Department of Biology
Advisor
Mione, Thomas
Type
Text
Digital Format
application/pdf
Language
eng
OCLC number
713735103
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