Antagonistic Transcription Factor Complexes Modulate the Floral Transition in Rice

A - Papers appearing in refereed journals

Brambilla, V., Martignago, D., Goretti, D., Cerise, M., Somssich, M., de Rosa, M., Galbiati, F., Shrestha, R., Lazzaro, F., Simon, R. and Fornara, F. 2017. Antagonistic Transcription Factor Complexes Modulate the Floral Transition in Rice. The Plant Cell. 29 (11), pp. 2801-2816. https://doi.org/10.1105/tpc.17.00645

AuthorsBrambilla, V., Martignago, D., Goretti, D., Cerise, M., Somssich, M., de Rosa, M., Galbiati, F., Shrestha, R., Lazzaro, F., Simon, R. and Fornara, F.
Abstract

Plants measure day or night lengths to coordinate specific developmental changes with a favorable season. In rice (Oryza
sativa), the reproductive phase is initiated by exposure to short days when expression of HEADING DATE 3a (Hd3a) and RICE
FLOWERING LOCUS T 1 (RFT1) is induced in leaves. The cognate proteins are components of the florigenic signal and move
systemically through the phloem to reach the shoot apical meristem (SAM). In the SAM, they form a transcriptional activation complex with the bZIP transcription factor OsFD1 to start panicle development. Here, we show that Hd3a and RFT1 can form transcriptional activation or repression complexes also in leaves and feed back to regulate their own transcription. Activation complexes depend on OsFD1 to promote flowering. However, additional bZIPs, including Hd3a BINDING REPRESSOR FACTOR1 (HBF1) and HBF2, form repressor complexes that reduce Hd3a and RFT1 expression to delay flowering. We propose that Hd3a and RFT1 are also active locally in leaves to fine-tune photoperiodic flowering response.

Year of Publication2017
JournalThe Plant Cell
Journal citation29 (11), pp. 2801-2816
Digital Object Identifier (DOI)https://doi.org/10.1105/tpc.17.00645
Open accessPublished as green open access
FunderBiotechnology and Biological Sciences Research Council
Publisher's version
Output statusPublished
Publication dates
Online17 Oct 2017
Publication process dates
Accepted16 Oct 2017
ISSN1532298X
PublisherAmerican Society of Plant Biologists, (ASPB), Rockville, MD
Copyright licenseCC BY

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