IFAB   27864
INSTITUTO DE INVESTIGACIONES FORESTALES Y AGROPECUARIAS BARILOCHE
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Common garden trial reveals genetic variation in bud burst phenology among and within natural populations of Nothofagus alpina.
Autor/es:
DUBOSCQ-CARRA, VIRGINIA G.; LETOURNEAU, FEDERICO J.; ARIAS RÍOS, JORGE A.; PASTORINO, MARIO J.; EL MUJTAR, VERÓNICA A.
Lugar:
Bariloche
Reunión:
Conferencia; International Conference "Adapting forest systems and Wood products to biotic and abiotic stress"; 2019
Institución organizadora:
Laboratorio internacional "Forestia", INRA - INTA
Resumen:
Phenological traits are crucial for understanding adaptation to global change due to their genetic control and association with abiotic factors. In temperate forest trees, bud burst is driven by a balance between survival and productivity. Nothofagus alpina is a foundation species of the temperate forests of Patagonia, very appreciated for its high quality wood. We aim to analyze the quantitative genetic variation of N. alpina in bud burst (BB) of plants growing in a common garden trial. We registered BB in 86 open pollinated families of 8 Argentinean natural populations. Apical buds were observed every three days in 6 years old (6YO) plants (N= 783), and three years later (9YO) apical and lateral buds in a sub-sample (N= 453), classifying the buds into five phenofases. Julian days (JD) until the buds opening (phenofase 3) were calculated and then analyzed by a linear mixed effects model. Apical BB in 6YO plants occurred on average on JD 287 and the model showed significant differences between populations. The family factor explained 16.34 % of the total variance (pLRT< 0.05). Average intra-population variation was high (mean h2= 0.61) and the additive genetic differentiation was moderate (QST= 14.9 %). Analysis in 9YO plants showed a similar genetic variation pattern and a correlation between lateral and apical buds, what allows following bud phenology through lateral buds in tall trees.