Author:
Belhassine Fares,Fumey Damien,Chopard Jérôme,Pradal Christophe,Martinez Sébastien,Costes Evelyne,Pallas Benoît
Abstract
AbstractFloral induction (FI) in shoot apical meristems (SAM) is assumed to be triggered by antagonistic endogenous signals. In fruit trees, FI occurs in some SAM only and is determined by activating and inhibiting signals originating from leaves and fruit, respectively. We developed a model (SigFlow) to quantify on 3D structures the combined impact of such signals and distances at which they act on SAM. Signal transport was simulated considering a signal ‘attenuation’ parameter, whereas SAM fate was determined by probability functions depending on signal quantities. Model behaviour was assessed on simple structures before being calibrated and validated on a unique experimental dataset of 3D digitized apple trees with contrasted crop loads and subjected to leaf and fruit removal at different scales of tree organization. Model parameter estimations and comparisons of two signal combination functions led us to formulate new assumptions on the mechanisms involved: (i) the activating signal could be transported at shorter distances than the inhibiting one (roughly 50 cm vs 1 m) (ii) both signals jointly act to determine FI with SAM being more sensitive to inhibiting signal than activating one. Finally, the genericity of the model is promising to further understand the physiological and architectural determinisms of FI in plants.
Publisher
Springer Science and Business Media LLC
Reference55 articles.
1. Monselise, S. P. & Goldschmidt, E. E. Alternate bearing in fruit trees. Hortic. Rev. 4, 128–173 (1982).
2. Wilkie, J. D., Sedgley, M. & Olesen, T. Regulation of floral initiation in horticultural trees. J. Exp. Bot. 59, 3215–3228 (2008).
3. Samach, A. & Smith, H. M. Constraints to obtaining consistent annual yields in perennials. II: Environment and fruit load affect induction of flowering. Plant Sci. 207, 168–176 (2013).
4. Costes, E., Lauri, P.-E. & Regnard, J.-L. Analyzing fruit tree architecture: Implications for tree management and fruit production. Hortic. Rev. 32, 1–61 (2006).
5. Neilsen, J. C. & Dennis, F. G. Effects of seed number, fruit removal, bourse shoot lenght and crop density on flowering in ‘spencer seedless’ apple. Acta Hortic. 527, 137–146 (2000).
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献