Integrating long-day flowering signals: a LEAFY binding site is essential for proper photoperiodic activation of APETALA1

Benlloch, ReyesSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Umeå universitet,Umeå Plant Science Centre (UPSC),Institutionen för skoglig genetik och växtfysiologi,Department of Forest Genetics and Plant Physiology (author)

Integrating long-day flowering signals : a LEAFY binding site is essential for proper photoperiodic activation of APETALA1

The transition to flowering in Arabidopsis is characterized by the sharp and localized upregulation of APETALA1 (AP1) transcription in the newly formed floral primordia. Both the flower meristem-identity gene LEAFY (LFY) and the photoperiod pathway involving the FLOWERING LOCUS T (FT) and FD genes contribute to this upregulation. These pathways have been proposed to act independently but their respective contributions and mode of interaction have remained elusive. To address these questions, we studied the AP1 regulatory region. Combining in vitro and in vivo approaches, we identified which of the three putative LFY binding sites present in the AP1 promoter is essential for its activation by LFY. Interestingly, we found that this site is also important for the correct photoperiodic-dependent upregulation of AP1. In contrast, a previously proposed putative FD-binding site appears dispensable and unable to bind FD and we found no evidence for FD binding to other sites in the AP1 promoter, suggesting that the FT/FD-dependent activation of AP1 might be indirect. Altogether, our data give new insight into the interaction between the FT and LFY pathways in the upregulation of AP1 transcription under long-day conditions.

Kim, Min ChulDivision of Applied Life Science (BK21 Program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju 660-701, Korea (author)
Sayou, Camille (author)
Thevenon, EmmanuelCEA, iRTSV, Laboratoire Physiologie Cellulaire et Végétale, F-38054 Grenoble, France (author)
Parcy, FrancoisCEA, iRTSV, Laboratoire Physiologie Cellulaire et Végétale, F-38054 Grenoble, France (author)
Nilsson, OveSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Umeå universitet,Umeå Plant Science Centre (UPSC),Institutionen för skoglig genetik och växtfysiologi,Department of Forest Genetics and Plant Physiology(Swepub:slu)48511 (author)
Umeå universitetUmeå Plant Science Centre (UPSC) (creator_code:org_t)
Sveriges lantbruksuniversitet

By the author/editor: Benlloch, Reyes; Kim, Min Chul; Sayou, Camille; Thevenon, Emmanu ...; Parcy, Francois; Nilsson, Ove

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Other Biological ...

By the university: Umeå University; Swedish University of Agricultural Sciences

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