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Protocols in ecological and environmental plant physiology


Article << Previous     |     Next >>   Contents Vol 35(10)

Coupling a 3D virtual wheat (Triticum aestivum) plant model with a Septoria tritici epidemic model (Septo3D): a new approach to investigate plant–pathogen interactions linked to canopy architecture

Corinne Robert A B E F, Christian Fournier C D E, Bruno Andrieu A B, Bertrand Ney A B

A INRA, UMR 1091 EGC, F-78850 Thiverval-Grignon, France.
B AgroParisTech, UMR 1091 EGC, F-78850 Thiverval-Grignon, France.
C INRA, UMR 759 LEPSE, 2 place Viala, F-34060 Montpellier Cedex 01, France.
D SupAgro, UMR 759 LEPSE, 2 Place Viala, F-34060 Montpellier, France.
E These authors contributed equally to the work.
F Corresponding author. Email: corinne.robert@grignon.inra.fr
This paper originates from a presentation at the 5th International Workshop on Functional–Structural Plant Models, Napier, New Zealand, November 2007.
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This work initiates a modelling approach that allows us to investigate the effects of canopy architecture on foliar epidemics development. It combines a virtual plant model of wheat (Triticum aestivum L.) with an epidemic model of Septoria tritici which is caused by Mycosphaerella graminicola, a hemi-biotrophic, splashed-dispersed fungus. Our model simulates the development of the lesions from the infected lower leaves to the healthy upper leaves in the growing canopy. Epidemics result from the repeated successions of lesion development (during which spores are produced) and spores dispersal. In the model, canopy development influences epidemic development through the amount of tissue available for lesion development and through its effects on rain penetration and droplets interception during spore dispersal. Simulations show that the impact of canopy architecture on epidemic development differs between canopy traits and depends on climate. Phyllochron has the strongest effect, followed by leaf size and stem elongation rate.

Keywords: disease escape, epidemic model, L-system, Mycosphaerella graminicola, plant–pathogen interaction, cv. Soissons, Triticum aestivum, 3D virtual plant model.

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