TY  - JOUR
A1  - Andrade, Luis
A1  - Lu, Yunlong
A1  - Cordeiro, Andre
A1  - Costa, João M. F.
A1  - Wigge, Philip Anthony
A1  - Saibo, Nelson J. M.
A1  - Jaeger, Katja E.
T1  - The evening complex integrates photoperiod signals to control flowering in rice
JF  - Proceedings of the National Academy of Sciences of the United States of America : PNAS
N2  - Plants use photoperiodism to activate flowering in response to a particular daylength. In rice, flowering is accelerated in short-day conditions, and even a brief exposure to light during the dark period (night-break) is sufficient to delay flowering. Although many of the genes involved in controlling flowering in rice have been uncovered, how the long- and short-day flowering pathways are integrated, and the mechanism of photoperiod perception is not understood. While many of the signaling components controlling photoperiod-activated flowering are conserved between Arabidopsis and rice, flowering in these two systems is activated by opposite photoperiods. Here we establish that photoperiodism in rice is controlled by the evening complex (EC). We show that mutants in the EC genes LUX ARRYTHMO (LUX) and EARLY FLOWERING3 (ELF3) paralogs abolish rice flowering. We also show that the EC directly binds and suppresses the expression of flowering repressors, including PRR37 and Ghd7. We further demonstrate that light acts via phyB to cause a rapid and sustained posttranslational modification of ELF3-1. Our results suggest a mechanism by which the EC is able to control both long- and short-day flowering pathways.
KW  - rice
KW  - flowering
KW  - ELF3
KW  - LUX
KW  - Evening Complex
Y1  - 2022
U6  - https://doi.org/10.1073/pnas.2122582119
SN  - 0027-8424
SN  - 1091-6490
VL  - 119
IS  - 26
PB  - National Acad. of Sciences
CY  - Washington
ER  - 
TY  - JOUR
A1  - Ramos-Sanchez, Jose M.
A1  - Triozzi, Paolo M.
A1  - Alique, Daniel
A1  - Geng, Feng
A1  - Gao, Mingjun
A1  - Jaeger, Katja E.
A1  - Wigge, Philip Anthony
A1  - Allona, Isabel
A1  - Perales, Mariano
T1  - LHY2 Integrates Night-Length Information to Determine Timing of Poplar Photoperiodic Growth
JF  - Current biology
N2  - Day length is a key indicator of seasonal information that determines major patterns of behavior in plants and animals. Photoperiodism has been described in plants for about 100 years, but the underlying molecular mechanisms of day length perception and signal transduction in many systems are not well understood. In trees, photoperiod perception plays a major role in growth cessation during the autumn as well as activating the resumption of shoot growth in the spring, both processes controlled by FLOWERING LOCUS T2 (FT2) expression levels and critical for the survival of perennial plants over winter [1-4]. It has been shown that the conserved role of poplar orthologs to Arabidopsis CONSTANS (CO) directly activates FT2 expression [1, 5]. Overexpression of poplar CO is, however, not sufficient to sustain FT2 expression under short days [5] , pointing to the presence of an additional short-day-dependent FT2 repression pathway in poplar. We find that night length information is transmitted via the expression level of a poplar clock gene, LATE ELONGATED HYPOCOTYL 2 (LHY2), which controls FT2 expression. Repression of FT2 is a function of the night extension and LHY2 expression level. We show that LHY2 is necessary and sufficient to activate night length repressive signaling. We propose that the photoperiodic control of shoot growth in poplar involves a balance between FT2 activating and repressing pathways. Our results show that poplar relies on night length measurement to determine photoperiodism through interaction between light signaling pathways and the circadian clock.
Y1  - 2019
U6  - https://doi.org/10.1016/j.cub.2019.06.003
SN  - 0960-9822
SN  - 1879-0445
VL  - 29
IS  - 14
SP  - 2402
EP  - 2406
PB  - Cell Press
CY  - Cambridge
ER  -