Effects of the Laurina mutation on the shoot apex in C. arabica cv. Laurina

Lécolier Aurélie, Verdeil Jean-Luc, Chrestin Hervé, Noirot Michel. 2007. Effects of the Laurina mutation on the shoot apex in C. arabica cv. Laurina. 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, 902-906. 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, also called Bourbon Pointu, appeared on the island of La Réunion following a spontaneous mutation in the Bourbon variety. One of the major visible effects of a mutation is the modification of the plant architecture towards a dwarf pyramidal shape. In order to understand this effect, the lateral organs initiation pattern was performed through shoot apex comparison of the two Bourbon varieties. The observations were performed through two ways: 1/ macroscopic description of an internode emergence cycle (phyllochron); 2/ microscopic descriptions of leaf primordium emergence cycle in an apical shoot apex and Shoot Apical Meristem (SAM) (plastochron). The last procedure allowed a fine histological description of the Coffea apex, between two leaf primordial emissions. Whatever the environmental conditions (field or greenhouse), within one month, the original cv. Bourbon grew six-fold higher than the cv. Bourbon pointu. Plastochron could not explain this difference. Whatever the environmental conditions (field or greenhouse), within one month, the original cv Bourbon grew six-fold higher than the cv Bourbon pointu. Plastochron could not explain this difference. In fact, the Laurina mutation acts very early on the periphery of the shoot apex concerning the future leaf and internode. By contrast, the meristem sensu stricto was not modified by the mutation.

Mots-clés Agrovoc : Coffea arabica, variété, nanisme, mutation, port de la plante, entre noeud, méristème apical, feuille, croissance

Mots-clés géographiques Agrovoc : La Réunion, France

Classification Agris : F50 - Anatomie et morphologie des plantes
F62 - Physiologie végétale - Croissance et développement
F30 - Génétique et amélioration des plantes

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/540093/)

Métriques

[ Page générée et mise en cache le 2024-04-05 ]