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Shoot development and dieback in progenies of Nothofagus obliqua |
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| Authors: | Javier Puntieri Javier Grosfeld Marina Stecconi Cecilia Brion María Marta Azpilicueta Leonardo Gallo Daniel Barthélémy |
| Institution: | 1. Departamento de Botánica, Universidad Nacional del Comahue, Quintal 1250, 8400, Bariloche, Argentina 2. Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina 3. Laboratorio de Genética Forestal, Instituto Nacional de Tecnología Agropecuaria, EEA Bariloche, Argentina 4. INRA, Unité Mixte de Recherche CIRAD-CNRS-INRA-IRD-Université Montpellier 2, “botAnique et bioinforMatique de l’Architecture des Plantes” (AMAP), UMR T51 (CIRAD), UMR 5120 (CNRS), UMR 931 (INRA), M123 (IRD), UM27 (UMII) TA A-51/PS2, Blvd. de la Lironde, 34398, Montpellier, Cedex 5, France |
| Abstract: | Shoot growth and dieback were compared among progenies of nursery-grown seedlings of Nothofagus obliqua belonging to seven progenies of the same provenance (Quila-Quina, Argentina). First-year shoots consisted of one growth unit (GU) and second-year shoots of one or two GUs. The probability of development of two GU was similar for all progenies. Progenies were different in terms of shoot size, terminal bud abscission, the extent of shoot dieback after shoot extension and the node of origin of the relay shoot on the first shoot. Plants with a second-year shoot consisting of two GUs had a thicker stem and more nodes than those with single-GU shoots. The selection of N. obliqua seed trees based on architectural traits suitable for forestry development at specific sites must contemplate variability among progenies and their probabilities of successful development under different conditions. |
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