Tree shape modification induced by the Laurina mutation in Coffea arabica L.

Lécolier Aurélie, Verdeil Jean-Luc, Chrestin Hervé, Noirot Michel. 2007. Tree shape modification induced by the Laurina mutation in Coffea arabica L.. In : 21st International Conference on Coffee Science, Montpellier (France), 11th - 15th September 2006 = 21ème Colloque scientifique international sur le café ; 21. Internationales Wissenshaftliches Kolloquium über Kaffee ; 21e Coloquio Cientifico Internacional sobre el Café. ASIC. Montpellier : ASIC, 935-938. ISBN 2-900212-20-0 Colloque Scientifique International sur le Café. 21, Montpellier, France, 11 Septembre 2006/15 Septembre 2006.

Résumé : Coffea arabica var. Laurina is a dwarf mutant of Coffea arabica var. Bourbon, with a characteristic pyramidal shape. The aim of this study was to understand the origin of shape changes between these two varieties. Tree-shape variation could theoretically depend on the angle formed between plagiotropic and orthotropic axes. Nethertheless the two Bourbon varieties exhibit a same (about 50°) angle between these axes, with a within-variety variation of 3° only. As the angle does not explain the main shape differences between the two varieties, a growth ratio (Ri) was defined between the length of plagiotropic and orthotropic axis. This parameter allowed differentiating the Bourbon and the Bourbon pointu. The elongation patterns of the last internodes on the orthotropic axis in regards to the plagiotropic branches could explain mostly the pyramidal shape of Bourbon pointu. In fact, the Laurina mutation affected the growth of last internodes of the orthotropic axes without affecting the plagiotropic ones.

Mots-clés Agrovoc : Coffea arabica, variété, port de la plante, mutation, développement biologique

Mots-clés complémentaires : Architecture des arbres

Classification Agris : F50 - Anatomie et morphologie des plantes
F62 - Physiologie végétale - Croissance et développement

Auteurs et affiliations

• Lécolier Aurélie, CIRAD-CP-UMR DGPC (FRA)
• Verdeil Jean-Luc, CIRAD-CP-UMR BEPC (FRA)
• Chrestin Hervé, CIRAD-CP-UMR DGPC (FRA)
• Noirot Michel, CIRAD-CP-UMR DGPC (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/540100/)

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