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Phytochrome B regulates Heading date 1 (Hd1)-mediated expression of rice florigen Hd3a and critical day length in rice
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Phytochrome B regulates Heading date 1 (Hd1)-mediated expression of rice florigen Hd3a and critical day length in rice
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Journal Article
Phytochrome B regulates Heading date 1 (Hd1)-mediated expression of rice florigen Hd3a and critical day length in rice
2011
Overview
Many plants require circadian clock and light information for the photoperiodic control of flowering. In
Arabidopsis
, a long-day plant (LDP), flowering is triggered by the circadian clock-controlled expression of
CONSTANS
(
CO
) and light stabilization of the CO protein to induce
FT
(
FLOWERING LOCUS T
). In rice, a short-day plant (SDP), the
CO
ortholog
Heading date 1
(
Hd1
) regulates
FT
ortholog
Hd3a
, but regulation of
Hd3a
by
Hd1
differs from that in
Arabidopsis
. Here, we report that phytochrome B (phyB)-mediated suppression of
Hd3a
is a primary cause of long-day suppression of flowering in rice, based on the three complementary discoveries. First, overexpression of
Hd1
causes a delay in flowering under SD conditions and this effect requires phyB, suggesting that light modulates Hd1 control of
Hd3a
transcription. Second, a single extension of day length decreases
Hd3a
expression proportionately with the length of daylight. Third, Hd1 protein levels in
Hd1
-overexpressing plants are not altered in the presence of light. These results also suggest that phyB-mediated suppression of
Hd3a
expression is a component of the molecular mechanism for critical day length in rice.
Publisher
Springer-Verlag,Springer Nature B.V
