Sugar availability is involved in rose bud outgrowth stimulation following a temporary light intensity restriction during the vegetative development of the main stem

Branching is a major agronomic variable determining yield and quality, and is very sensitive to environmental conditions. Previous studies on rose showed that a continuous high light intensity perceived during the bud outgrowth period stimulated bud outgrowth compared to a continuous low light intensity. This effect was related to higher cytokinin contents in the nodes. Interestingly, a temporary light intensity restriction applied before the bud outgrowth period over-stimulated bud outgrowth, but the mechanisms involved remain unknown. In this case, we assume a non-limitation in cytokinins because of the current high light intensity during the bud outgrowth period, but an increase in sugars that would explain bud outgrowth stimulation. To test sugar involvement, we quantified bud outgrowth, sugar contents, and the balance between sources and sinks for sugars in the bud outgrowth period of plants grown under either continuous high light intensity or under a temporary light restriction followed by a high light intensity. In addition, we quantified the effect of exogenous sugar supply on bud outgrowth for plants under continuous high light intensity, and the effect of leaf masking under the non-continuous treatment. Our results showed that after a temporary light intensity restriction and return to high light intensity, sugars accumulated compared to a continuous high light intensity. Furthermore, the growth of apical organs was reduced indicating that sugar accumulation might be due to a higher balance between sources and sinks for sugars. Exogenous sucrose supply through the petiole of intact plants grown under high light intensity stimulated bud outgrowth. Conversely, leaf masking after a temporary light intensity restriction inhibited bud outgrowth. This supports that sugar accumulation is an important trigger of bud outgrowth after a temporary light intensity restriction. Together these results indicate that an anterior low light intensity applied during the main stem development reduces growth of apical organs while higher sugar availability afterward favours lateral bud outgrowth.

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Main Authors: Schneider, A., Boudon, Frédéric, Demotes-Mainard, Sabine, Ledroit, Lydie, Perez-Garcia, Maria-Dolores, Brouard, N., Godin, Christophe, Sakr, Soulaïman, Bertheloot, Jessica
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Language:eng
Published: ISHS
Online Access:http://agritrop.cirad.fr/605625/
http://agritrop.cirad.fr/605625/1/Schneider%20-%20GreenSys%20-%202019.pdf
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description Branching is a major agronomic variable determining yield and quality, and is very sensitive to environmental conditions. Previous studies on rose showed that a continuous high light intensity perceived during the bud outgrowth period stimulated bud outgrowth compared to a continuous low light intensity. This effect was related to higher cytokinin contents in the nodes. Interestingly, a temporary light intensity restriction applied before the bud outgrowth period over-stimulated bud outgrowth, but the mechanisms involved remain unknown. In this case, we assume a non-limitation in cytokinins because of the current high light intensity during the bud outgrowth period, but an increase in sugars that would explain bud outgrowth stimulation. To test sugar involvement, we quantified bud outgrowth, sugar contents, and the balance between sources and sinks for sugars in the bud outgrowth period of plants grown under either continuous high light intensity or under a temporary light restriction followed by a high light intensity. In addition, we quantified the effect of exogenous sugar supply on bud outgrowth for plants under continuous high light intensity, and the effect of leaf masking under the non-continuous treatment. Our results showed that after a temporary light intensity restriction and return to high light intensity, sugars accumulated compared to a continuous high light intensity. Furthermore, the growth of apical organs was reduced indicating that sugar accumulation might be due to a higher balance between sources and sinks for sugars. Exogenous sucrose supply through the petiole of intact plants grown under high light intensity stimulated bud outgrowth. Conversely, leaf masking after a temporary light intensity restriction inhibited bud outgrowth. This supports that sugar accumulation is an important trigger of bud outgrowth after a temporary light intensity restriction. Together these results indicate that an anterior low light intensity applied during the main stem development reduces growth of apical organs while higher sugar availability afterward favours lateral bud outgrowth.
format conference_item
author Schneider, A.
Boudon, Frédéric
Demotes-Mainard, Sabine
Ledroit, Lydie
Perez-Garcia, Maria-Dolores
Brouard, N.
Godin, Christophe
Sakr, Soulaïman
Bertheloot, Jessica
spellingShingle Schneider, A.
Boudon, Frédéric
Demotes-Mainard, Sabine
Ledroit, Lydie
Perez-Garcia, Maria-Dolores
Brouard, N.
Godin, Christophe
Sakr, Soulaïman
Bertheloot, Jessica
Sugar availability is involved in rose bud outgrowth stimulation following a temporary light intensity restriction during the vegetative development of the main stem
author_facet Schneider, A.
Boudon, Frédéric
Demotes-Mainard, Sabine
Ledroit, Lydie
Perez-Garcia, Maria-Dolores
Brouard, N.
Godin, Christophe
Sakr, Soulaïman
Bertheloot, Jessica
author_sort Schneider, A.
title Sugar availability is involved in rose bud outgrowth stimulation following a temporary light intensity restriction during the vegetative development of the main stem
title_short Sugar availability is involved in rose bud outgrowth stimulation following a temporary light intensity restriction during the vegetative development of the main stem
title_full Sugar availability is involved in rose bud outgrowth stimulation following a temporary light intensity restriction during the vegetative development of the main stem
title_fullStr Sugar availability is involved in rose bud outgrowth stimulation following a temporary light intensity restriction during the vegetative development of the main stem
title_full_unstemmed Sugar availability is involved in rose bud outgrowth stimulation following a temporary light intensity restriction during the vegetative development of the main stem
title_sort sugar availability is involved in rose bud outgrowth stimulation following a temporary light intensity restriction during the vegetative development of the main stem
publisher ISHS
url http://agritrop.cirad.fr/605625/
http://agritrop.cirad.fr/605625/1/Schneider%20-%20GreenSys%20-%202019.pdf
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spelling dig-cirad-fr-6056252024-02-22T09:31:53Z http://agritrop.cirad.fr/605625/ http://agritrop.cirad.fr/605625/ Sugar availability is involved in rose bud outgrowth stimulation following a temporary light intensity restriction during the vegetative development of the main stem. Schneider A., Boudon Frédéric, Demotes-Mainard Sabine, Ledroit Lydie, Perez-Garcia Maria-Dolores, Brouard N., Godin Christophe, Sakr Soulaïman, Bertheloot Jessica. 2020. In : Proceedings of the International Symposium on Advanced Technologies and Management for Innovative Greenhouses – GreenSys2019 volume 1 and 2. Bournet P.E. (ed.), Brajeul E. (ed.), Fatnassi H. (ed.). ISHS. Louvain : ISHS, 395-400. (Acta Horticulturae, 1296) ISBN 978-94-62612-94-5 International Symposium on Advanced Technologies and Management for Innovative Greenhouses (GreenSys 2019), Angers, France, 16 Juin 2019/20 Juin 2019.https://doi.org/10.17660/ActaHortic.2020.1296.51 <https://doi.org/10.17660/ActaHortic.2020.1296.51> Sugar availability is involved in rose bud outgrowth stimulation following a temporary light intensity restriction during the vegetative development of the main stem Schneider, A. Boudon, Frédéric Demotes-Mainard, Sabine Ledroit, Lydie Perez-Garcia, Maria-Dolores Brouard, N. Godin, Christophe Sakr, Soulaïman Bertheloot, Jessica eng 2020 ISHS Proceedings of the International Symposium on Advanced Technologies and Management for Innovative Greenhouses – GreenSys2019 volume 1 and 2 Branching is a major agronomic variable determining yield and quality, and is very sensitive to environmental conditions. Previous studies on rose showed that a continuous high light intensity perceived during the bud outgrowth period stimulated bud outgrowth compared to a continuous low light intensity. This effect was related to higher cytokinin contents in the nodes. Interestingly, a temporary light intensity restriction applied before the bud outgrowth period over-stimulated bud outgrowth, but the mechanisms involved remain unknown. In this case, we assume a non-limitation in cytokinins because of the current high light intensity during the bud outgrowth period, but an increase in sugars that would explain bud outgrowth stimulation. To test sugar involvement, we quantified bud outgrowth, sugar contents, and the balance between sources and sinks for sugars in the bud outgrowth period of plants grown under either continuous high light intensity or under a temporary light restriction followed by a high light intensity. In addition, we quantified the effect of exogenous sugar supply on bud outgrowth for plants under continuous high light intensity, and the effect of leaf masking under the non-continuous treatment. Our results showed that after a temporary light intensity restriction and return to high light intensity, sugars accumulated compared to a continuous high light intensity. Furthermore, the growth of apical organs was reduced indicating that sugar accumulation might be due to a higher balance between sources and sinks for sugars. Exogenous sucrose supply through the petiole of intact plants grown under high light intensity stimulated bud outgrowth. Conversely, leaf masking after a temporary light intensity restriction inhibited bud outgrowth. This supports that sugar accumulation is an important trigger of bud outgrowth after a temporary light intensity restriction. Together these results indicate that an anterior low light intensity applied during the main stem development reduces growth of apical organs while higher sugar availability afterward favours lateral bud outgrowth. conference_item info:eu-repo/semantics/conferenceObject Conference info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/605625/1/Schneider%20-%20GreenSys%20-%202019.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.17660/ActaHortic.2020.1296.51 10.17660/ActaHortic.2020.1296.51 https://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=222539 info:eu-repo/semantics/altIdentifier/doi/10.17660/ActaHortic.2020.1296.51 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.17660/ActaHortic.2020.1296.51