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Reversion of fruit‐dependent inhibition of flowering in Citrus requires sprouting of buds with epigenetically silenced CcMADS19

Mesejo, Carlos; Marzal, Andres; Martinez Fuentes, Amparo; Reig, Carmina; de Lucas, Miguel; Iglesias, Domingo J.; Primo Millo, Eduardo; Blazquez, Miguel A.; Agusti, Manuel

Reversion of fruit‐dependent inhibition of flowering in Citrus requires sprouting of buds with epigenetically silenced CcMADS19 Thumbnail


Authors

Carlos Mesejo

Andres Marzal

Amparo Martinez Fuentes

Carmina Reig

Domingo J. Iglesias

Eduardo Primo Millo

Miguel A. Blazquez

Manuel Agusti



Abstract

In Citrus, the response to environmental floral inductive signals is inhibited by the presence of developing fruits. The mechanism involves epigenetic activation of the CcMADS19 locus (FLC orthologue), encoding a floral repressor. To understand how this epigenetic regulation is reverted to allow flowering in the following season, we have forced precocious sprouting of axillary buds in fruit-bearing shoots, and examined the competence to floral inductive signals of old and new leaves derived from them. We have found that CcMADS19 is enriched in repressive H3K27me3 marks in young, but not old leaves, revealing that axillary buds retain a silenced version of the floral repressor that is mitotically transmitted to the newly emerging leaves, which are able to induce flowering. Therefore, we propose that flowering in Citrus is necessarily preceded by vegetative sprouting, so that the competence to respond to floral inductive signals is reset in the new leaves.

Citation

Mesejo, C., Marzal, A., Martinez Fuentes, A., Reig, C., de Lucas, M., Iglesias, D. J., …Agusti, M. (2022). Reversion of fruit‐dependent inhibition of flowering in Citrus requires sprouting of buds with epigenetically silenced CcMADS19. New Phytologist, 233(1), 526 - 533. https://doi.org/10.1111/nph.17681

Journal Article Type Article
Acceptance Date Aug 10, 2021
Online Publication Date Dec 2, 2021
Publication Date 2022-01
Deposit Date Oct 29, 2021
Publicly Available Date Mar 28, 2024
Journal New Phytologist
Print ISSN 0028-646X
Electronic ISSN 1469-8137
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 233
Issue 1
Pages 526 - 533
DOI https://doi.org/10.1111/nph.17681

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Advance online version This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.




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