Light Regulation of Axillary Bud Outgrowth Along Plant Axes: An Overview of the Roles of Sugars and Hormones

Apical dominance, the process by which the growing apical zone of the shoot inhibits bud outgrowth, involves an intricate network of several signals in the shoot. Auxin originating from plant apical region inhibits bud outgrowth indirectly. This inhibition is in particular mediated by cytokinins and...

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Bibliographic Details
Published in:Frontiers in plant science 2019-10, Vol.10, p.1296-1296
Main Authors: Schneider, Anne, Godin, Christophe, Boudon, Frédéric, Demotes-Mainard, Sabine, Sakr, Soulaiman, Bertheloot, Jessica
Format: Article
Language:English
Subjects:
Agricultural sciences
apical dominance
Bioinformatics
branching
bud outgrowth
Computer Science
hormones
Life Sciences
light
Microbiology and Parasitology
Plant Science
sugar
Vegetal Biology
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Summary:Apical dominance, the process by which the growing apical zone of the shoot inhibits bud outgrowth, involves an intricate network of several signals in the shoot. Auxin originating from plant apical region inhibits bud outgrowth indirectly. This inhibition is in particular mediated by cytokinins and strigolactones, which move from the stem to the bud and that respectively stimulate and repress bud outgrowth. The action of this hormonal network is itself modulated by sugar levels as competition for sugars, caused by the growing apical sugar sink, may deprive buds from sugars and prevents bud outgrowth partly by their signaling role. In this review, we analyze recent findings on the interaction between light, in terms of quantity and quality, and apical dominance regulation. Depending on growth conditions, light may trigger different pathways of the apical dominance regulatory network. Studies pinpoint to the key role of shoot-located cytokinin synthesis for light intensity and abscisic acid synthesis in the bud for R:FR in the regulation of bud outgrowth by light. Our analysis provides three major research lines to get a more comprehensive understanding of light effects on bud outgrowth. This would undoubtedly benefit from the use of computer modeling associated with experimental observations to deal with a regulatory system that involves several interacting signals, feedbacks, and quantitative effects.
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2019.01296