Tree shape modification induced by the Laurina mutation in Coffea arabica L.
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.
| Main Authors: | , , , |
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| Format: | conference_item biblioteca |
| Language: | eng |
| Published: |
ASIC
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| Subjects: | F50 - Anatomie et morphologie des plantes, F62 - Physiologie végétale - Croissance et développement, Coffea arabica, variété, port de la plante, mutation, développement biologique, http://aims.fao.org/aos/agrovoc/c_1721, http://aims.fao.org/aos/agrovoc/c_8157, http://aims.fao.org/aos/agrovoc/c_5969, http://aims.fao.org/aos/agrovoc/c_5014, http://aims.fao.org/aos/agrovoc/c_921, |
| Online Access: | http://agritrop.cirad.fr/540100/ http://agritrop.cirad.fr/540100/1/ID540100.pdf |
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