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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

How different pruning severities alter shoot structure: a modelling approach in young ‘Nonpareil’ almond trees

Claudia Negrón A , Loreto Contador A , Bruce D. Lampinen A , Samuel G. Metcalf A , Yann Guédon B , Evelyne Costes C and Theodore M. DeJong A D
+ Author Affiliations
- Author Affiliations

A Department of Plant Sciences, University of California, One Shields Avenue, Davis, CA 95616, USA.

B UMR AGAP CIRAD/INRA/Montpellier SupAgro, Virtual Plants, INRIA, Avenue Agropolis, TA-A-108/03, 34398, Montpellier Cedex 5, France.

C UMR AGAP CIRAD/INRA/Montpellier SupAgro, Equipe Architecture et Fonctionnement des Espèces Fruitières, Avenue Agropolis, TA-A-108/03, 34398 Montpellier Cedex 5, France.

D Corresponding author. Email: tmdejong@ucdavis.edu

Functional Plant Biology 42(3) 325-335 https://doi.org/10.1071/FP14025
Submitted: 18 January 2014  Accepted: 29 October 2014   Published: 26 November 2014

Abstract

Axillary meristem fate patterns along shoots, also referred to as shoot structure, appear to be fairly consistent among trees within a genotype growing under similar conditions. Less is known about shoot structural plasticity following external manipulations, such as pruning. The aim of this study on almond (Prunus dulcis (Mill.)) shoots was to investigate how pruning severity affects the structure of 1-year-old shoots that grew after pruning (regrowth shoots), the 2-year-old portion of shoots that remained from the previous year’s growth after pruning (pruned shoots), and whether regrowth shoots reiterate the structure of the original 1-year-old shoots before pruning. Three pruning severities were imposed and the structures along the different shoots were assessed by building hidden semi-Markov models of axillary meristem fates. The structures of regrowth and pruned shoots depended on pruning severity, but maintained some of the original shoot characteristics. Regrowth shoots developed more complex structures with severe pruning, but had simpler structures than original shoots indicating progressive simplification with tree age. Pruned shoot structures were affected by the severity of pruning, by the structure when the shoots were 1 year old, and probably by local competition among buds. Changes in structure due to pruning can be modelled and be predictable.

Additional keywords: axillary meristem, heading, hidden semi-Markov model, proleptic shoot, Prunus dulcis, sylleptic shoot.


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