SRR1 is essential to repress flowering in non-inductive conditions in Arabidopsis thaliana

Johansson M, Staiger D (2014)
Journal of Experimental Botany 65(20): 5811-5822.

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Abstract
Timing of flowering is determined by environmental and developmental signals, leading to promotion or repression of key floral integrators. SENSITIVITY TO RED LIGHT REDUCED (SRR1) is a pioneer protein previously shown to be involved in regulation of the circadian clock and phytochrome B signalling in Arabidopsis thaliana. This report has examined the role of SRR1 in flowering time control. Loss-of-function srr1-1 plants flowered very early compared with the wild type under short-day conditions and had a weak flowering response to increasing daylength. Furthermore, FLOWERING LOCUS T (FT) transcript levels were elevated already in short days in srr1-1 compared with the wild type. This correlated with elevated end of day levels of CONSTANS (CO), whereas levels of CYCLING DOF FACTOR 1 (CDF1), a repressor of CO transcription, were reduced. srr1-1 gi-2 and srr1-1 co-9 double mutants showed that SRR1 can also repress flowering independently of the photoperiodic pathway. srr1-1 flowered consistently early between 16 °C and 27 °C, showing that SRR1 prevents premature flowering over a wide temperature range. SRR1 also promotes expression of the repressors TEMPRANILLO 1 (TEM1) and TEM2. Consequently their targets in the gibberellin biosynthesis pathway were elevated in srr1-1. SRR1 is thus an important focal point of both photoperiodic and photoperiod-independent regulation of flowering. By stimulating expression of the FT-binding repressors CDF1, TEM1 and TEM2, and FLC, flowering is inhibited in non-inductive conditions.
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Johansson M, Staiger D. SRR1 is essential to repress flowering in non-inductive conditions in Arabidopsis thaliana. Journal of Experimental Botany. 2014;65(20):5811-5822.
Johansson, M., & Staiger, D. (2014). SRR1 is essential to repress flowering in non-inductive conditions in Arabidopsis thaliana. Journal of Experimental Botany, 65(20), 5811-5822.
Johansson, M., and Staiger, D. (2014). SRR1 is essential to repress flowering in non-inductive conditions in Arabidopsis thaliana. Journal of Experimental Botany 65, 5811-5822.
Johansson, M., & Staiger, D., 2014. SRR1 is essential to repress flowering in non-inductive conditions in Arabidopsis thaliana. Journal of Experimental Botany, 65(20), p 5811-5822.
M. Johansson and D. Staiger, “SRR1 is essential to repress flowering in non-inductive conditions in Arabidopsis thaliana”, Journal of Experimental Botany, vol. 65, 2014, pp. 5811-5822.
Johansson, M., Staiger, D.: SRR1 is essential to repress flowering in non-inductive conditions in Arabidopsis thaliana. Journal of Experimental Botany. 65, 5811-5822 (2014).
Johansson, Mikael, and Staiger, Dorothee. “SRR1 is essential to repress flowering in non-inductive conditions in Arabidopsis thaliana”. Journal of Experimental Botany 65.20 (2014): 5811-5822.
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2 Citations in Europe PMC

Data provided by Europe PubMed Central.

Time to flower: interplay between photoperiod and the circadian clock.
Johansson M, Staiger D., J. Exp. Bot. 66(3), 2015
PMID: 25371508

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