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Senescence in dahlia flowers is regulated by a complex interplay between flower age and floret position

Mechanisms regulating flower senescence are not fully understood in any species and are particularly complex in composite flowers. Dahlia (Dahlia pinnata Cav.) florets develop sequentially, hence each composite flower head includes florets of different developmental stages as the whole flower head a...

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Autores principales: Casey, Matthew, Marchioni, Ilaria, Lear, Bianca, Cort, Alex P., Baldwin, Ashley, Rogers, Hilary J., Stead, Anthony D.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9880482/
https://www.ncbi.nlm.nih.gov/pubmed/36714770
http://dx.doi.org/10.3389/fpls.2022.1085933
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author Casey, Matthew
Marchioni, Ilaria
Lear, Bianca
Cort, Alex P.
Baldwin, Ashley
Rogers, Hilary J.
Stead, Anthony D.
author_facet Casey, Matthew
Marchioni, Ilaria
Lear, Bianca
Cort, Alex P.
Baldwin, Ashley
Rogers, Hilary J.
Stead, Anthony D.
author_sort Casey, Matthew
collection PubMed
description Mechanisms regulating flower senescence are not fully understood in any species and are particularly complex in composite flowers. Dahlia (Dahlia pinnata Cav.) florets develop sequentially, hence each composite flower head includes florets of different developmental stages as the whole flower head ages. Moreover, the wide range of available cultivars enables assessment of intraspecific variation. Transcriptomes were compared amongst inner (younger) and outer (older) florets of two flower head ages to assess the effect of floret vs. flower head ageing. More gene expression, including ethylene and cytokinin pathway expression changed between inner and outer florets of older flower heads than between inner florets of younger and older flower heads. Additionally, based on Arabidopsis network analysis, different patterns of co-expressed ethylene response genes were elicited. This suggests that changes occur in young inner florets as the whole flower head ages that are different to ageing florets within a flower head. In some species floral senescence is orchestrated by the plant growth regulator ethylene. However, there is both inter and intra-species variation in its importance. There is a lack of conclusive data regarding ethylene sensitivity in dahlia. Speed of senescence progression, effects of ethylene signalling perturbation, and patterns of ethylene biosynthesis gene expression differed across three dahlia cultivars (‘Sylvia’, ‘Karma Prospero’ and ‘Onesta’) suggesting differences in the role of ethylene in their floral senescence, while effects of exogenous cytokinin were less cultivar-specific.
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spelling pubmed-98804822023-01-28 Senescence in dahlia flowers is regulated by a complex interplay between flower age and floret position Casey, Matthew Marchioni, Ilaria Lear, Bianca Cort, Alex P. Baldwin, Ashley Rogers, Hilary J. Stead, Anthony D. Front Plant Sci Plant Science Mechanisms regulating flower senescence are not fully understood in any species and are particularly complex in composite flowers. Dahlia (Dahlia pinnata Cav.) florets develop sequentially, hence each composite flower head includes florets of different developmental stages as the whole flower head ages. Moreover, the wide range of available cultivars enables assessment of intraspecific variation. Transcriptomes were compared amongst inner (younger) and outer (older) florets of two flower head ages to assess the effect of floret vs. flower head ageing. More gene expression, including ethylene and cytokinin pathway expression changed between inner and outer florets of older flower heads than between inner florets of younger and older flower heads. Additionally, based on Arabidopsis network analysis, different patterns of co-expressed ethylene response genes were elicited. This suggests that changes occur in young inner florets as the whole flower head ages that are different to ageing florets within a flower head. In some species floral senescence is orchestrated by the plant growth regulator ethylene. However, there is both inter and intra-species variation in its importance. There is a lack of conclusive data regarding ethylene sensitivity in dahlia. Speed of senescence progression, effects of ethylene signalling perturbation, and patterns of ethylene biosynthesis gene expression differed across three dahlia cultivars (‘Sylvia’, ‘Karma Prospero’ and ‘Onesta’) suggesting differences in the role of ethylene in their floral senescence, while effects of exogenous cytokinin were less cultivar-specific. Frontiers Media S.A. 2023-01-13 /pmc/articles/PMC9880482/ /pubmed/36714770 http://dx.doi.org/10.3389/fpls.2022.1085933 Text en Copyright © 2023 Casey, Marchioni, Lear, Cort, Baldwin, Rogers and Stead https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Plant Science
Casey, Matthew
Marchioni, Ilaria
Lear, Bianca
Cort, Alex P.
Baldwin, Ashley
Rogers, Hilary J.
Stead, Anthony D.
Senescence in dahlia flowers is regulated by a complex interplay between flower age and floret position
title Senescence in dahlia flowers is regulated by a complex interplay between flower age and floret position
title_full Senescence in dahlia flowers is regulated by a complex interplay between flower age and floret position
title_fullStr Senescence in dahlia flowers is regulated by a complex interplay between flower age and floret position
title_full_unstemmed Senescence in dahlia flowers is regulated by a complex interplay between flower age and floret position
title_short Senescence in dahlia flowers is regulated by a complex interplay between flower age and floret position
title_sort senescence in dahlia flowers is regulated by a complex interplay between flower age and floret position
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9880482/
https://www.ncbi.nlm.nih.gov/pubmed/36714770
http://dx.doi.org/10.3389/fpls.2022.1085933
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