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Plant function and evolutionary biology
RESEARCH ARTICLE

Simulation of inflorescence dynamics in oil palm and estimation of environment-sensitive phenological phases: a model based analysis

Jean-Claude Combres A E , Benoît Pallas B E F , Lauriane Rouan A , Isabelle Mialet-Serra C , Jean-Pierre Caliman D , Serge Braconnier A , Jean-Christophe Soulié A and Michael Dingkuhn A
+ Author Affiliations
- Author Affiliations

A CIRAD, UMR AGAP, Avenue d’Agropolis, F-34398 Montpellier cedex 5, France.

B Montpellier SupAgro, UMR AGAP, Avenue d’Agropolis, F-34398 Montpellier cedex 5, France.

C CIRAD, DG, Avenue d’Agropolis, F-34398 Montpellier cedex 5, France.

D SMART Research Institute, Pekanbaru 28112, Indonesia.

E These authors equally contributed to this work.

F Corresponding author. Email: pallas@supagro.inra.fr

Functional Plant Biology 40(3) 263-279 https://doi.org/10.1071/FP12133
Submitted: 27 April 2012  Accepted: 22 September 2012   Published: 12 November 2012

Abstract

For oil palm, yield variation is in large part due to variation in the number of harvested bunches. Each successively-produced phytomer carries a female (productive), male or aborted inflorescence. Since phytomer development takes 3–4 years and nearly two phytomers are produced per month, many inflorescences develop in parallel but have different phenological stages. Environment-dependent developmental rate, sex and abortion probability determine bunch productivity, which, in turn, affects other phytomers via source–sink relationships. Water deficit, solar radiation, temperature and day length are considered key external factors driving variation. Their impact is difficult to predict because of system complexity. To address this question we built a simple model (ECOPALM) to simulate the variation in number of harvested bunches. In this model, trophic competition among organs, expressed through a plant-scale index (Ic), drives sex determination and inflorescence abortion during specific sensitive phases at phytomer level. As a supplemental hypothesis, we propose that flowering is affected by photoperiod at phytomer level during a sensitive phase, thus, contributing to seasonal production peaks. The model was used to determine by parameter optimisation the influence of Ic and day length on inflorescence development and the stages at which inflorescences are sensitive to these signals. Parameters were estimated against observation of number of harvested bunches in Ivory Coast using a genetic algorithm. The model was then validated with field observations in Benin and Indonesia. The sensitive phases determined by parameter optimisation agreed with independent experimental evidence, and variation of Ic explained both sex and abortion patterns. Sex determination seemed to coincide with floret meristem individualisation and occurred 29–32 months before bunch harvest. The main abortion stage occurred 10 months before harvest – at the beginning of rapid growth of the inflorescence. Simulation results suggest involvement of photoperiod in the determination of bunch growth dynamics. This study demonstrates that simple modelling approaches can help extracting ecophysiological information from simple field observations on complex systems.

Additional keywords: Elaeis guineensis, inflorescence abortion, parameter optimisation, photoperiod, plant growth model, sex determination, source–sink relationships.


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