Abstract
Original language | English |
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Pages (from-to) | 13313-13318 |
Number of pages | 6 |
Journal | Proceedings of the National Academy of Sciences of the United States of America |
Volume | 99 |
Issue number | 20 |
DOIs | |
Publication status | Published - 1 Oct 2002 |
Externally published | Yes |
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Keywords
- flowering
- photoperiodism
- circadian
- CONSTANS
Cite this
Floral responses to photoperiod are correlated with the timing of rhythmic expression relative to dawn and dusk in Arabidopsis. / Roden, Laura C; Song, Hae-Ryong; Jackson, Stephen; Morris, Karl; Carre, Isabelle A.
In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 99, No. 20, 01.10.2002, p. 13313-13318.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Floral responses to photoperiod are correlated with the timing of rhythmic expression relative to dawn and dusk in Arabidopsis
AU - Roden, Laura C
AU - Song, Hae-Ryong
AU - Jackson, Stephen
AU - Morris, Karl
AU - Carre, Isabelle A
PY - 2002/10/1
Y1 - 2002/10/1
N2 - Daylength, or photoperiod, is perceived as a seasonal signal for the control of flowering of many plants. The measurement of daylength is thought to be mediated through the interaction of phototransduction pathways with a circadian rhythm, so that flowering is induced (in long-day plants) or repressed (in short-day plants) when light coincides with a sensitive phase of the circadian cycle. To test this hypothesis in the facultative long-day plant, Arabidopsis thaliana, we used varying, non-24-hr light/dark cycles to alter the timing of circadian rhythms of gene expression relative to dawn and dusk. Effects on circadian rhythms were correlated with those on flowering times. We show that conditions that displaced subjective night events, such as expression of the flowering time regulator CONSTANS into the light portion of the cycle, were perceived as longer days. This work demonstrates that the perception of daylength in Arabidopsis relies on adjustments of the phase angle of circadian rhythms relative to the light/dark cycle, rather than on the measurement of the absolute duration of light and darkness.
AB - Daylength, or photoperiod, is perceived as a seasonal signal for the control of flowering of many plants. The measurement of daylength is thought to be mediated through the interaction of phototransduction pathways with a circadian rhythm, so that flowering is induced (in long-day plants) or repressed (in short-day plants) when light coincides with a sensitive phase of the circadian cycle. To test this hypothesis in the facultative long-day plant, Arabidopsis thaliana, we used varying, non-24-hr light/dark cycles to alter the timing of circadian rhythms of gene expression relative to dawn and dusk. Effects on circadian rhythms were correlated with those on flowering times. We show that conditions that displaced subjective night events, such as expression of the flowering time regulator CONSTANS into the light portion of the cycle, were perceived as longer days. This work demonstrates that the perception of daylength in Arabidopsis relies on adjustments of the phase angle of circadian rhythms relative to the light/dark cycle, rather than on the measurement of the absolute duration of light and darkness.
KW - flowering
KW - photoperiodism
KW - circadian
KW - CONSTANS
U2 - 10.1073/pnas.192365599
DO - 10.1073/pnas.192365599
M3 - Article
VL - 99
SP - 13313
EP - 13318
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
SN - 0027-8424
IS - 20
ER -