The FT/FD-dependent initiation of flowering under long-day conditions in the day-neutral species Nicotiana tabacum originates from the facultative short-day ancestor Nicotiana tomentosiformis

The Plant Journal : for Cell and Molecular Biology
Farina A BeineckeGundula A Noll

Abstract

Photoperiod is an important external stimulus governing the precise timing of the floral transition in plants. Members of the FLOWERING LOCUS T (FT)-like clade of phosphatidylethanolamine-binding proteins induce this developmental process in numerous species by forming regulatory protein complexes with FD-like bZIP transcription factors. We identified several thus far unknown FT-like and FD-like genes in the genus Nicotiana and found that, even in the day-neutral species Nicotiana tabacum, floral initiation requires the photoperiod-dependent expression of several FT-like genes. Furthermore, floral promotion under long-day (LD) and short-day (SD) conditions is mediated by an FT-like protein (NtFT5) that originates from the genome of the paternal, facultative SD ancestor Nicotiana tomentosiformis. In contrast, its ortholog of the maternal LD ancestor Nicotiana sylvestris is not present in the genome of N. tabacum cv. SR1. Expression profiling in N. tabacum and its ancestors confirmed the relevance of these FT and FD orthologs in the context of polyploidization. We also found that floral inhibition by tobacco FT-like proteins is not restricted to SD conditions, highlighting the coincident expression of tobacco FT-like genes encodi...Continue Reading

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Citations

Sep 2, 2020·Proceedings of the National Academy of Sciences of the United States of America·Guojing ShenJianqiang Wu
Jan 31, 2020·Frontiers in Plant Science·Florentin J SchmidtGundula A Noll
Feb 23, 2020·International Journal of Molecular Sciences·Muhammad Jawaad AtifZhihui Cheng
Jul 3, 2021·Scientific Reports·Yaarit KutsherMoshe Reuveni

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