Artículo
Morpho-physiological responses of Nothofagus obliqua to light intensity and water status, with focus on primary growth dynamics
Torres, Cristian Daniel
; Magnin, Noel Amaru
; Varela, Santiago Agustín; Stecconi, Marina
; Grosfeld, Javier Edgardo
; Puntieri, Javier Guido
Fecha de publicación:
10/2018
Editorial:
Springer
Revista:
Trees
ISSN:
0931-1890
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Key message: Intra-individual variations of plant responses to environmental conditions are related to axis differentiation. Plastic responses include variations in primary growth, shoot allometry, leaves’ chlorophyll content and water use efficiency. Abstract: Primary growth affects plant plasticity by influencing the number, spatial arrangement and time of differentiation of the leaves. For Nothofagus obliqua, we evaluated if primary shoot growth dynamics determines short-term responses to environmental conditions, and intra-individual variations in such responses. Before bud-break, saplings were located in experimental conditions, combining two light treatments with two water supply treatments. For each individual, morphology, relative extension rate (RER), and relative leaf chlorophyll content (SPAD units) were registered for the annual shoot derived from the most distal bud of two axis categories: the main axis (trunk) and a main branch. For trunk shoots, we analysed the net photosynthetic rate at saturating photosynthetic photon flux density (Psat) of proximal and distal leaves. Shaded trees had higher RER, longer and more slender shoots, longer internodes, and higher leaf chlorophyll content than unshaded trees. The number of nodes was affected by water condition in trunk shoots, and by light condition in main branch shoots. Full sunlight stimulated the development of a branch following the length and growth direction of its parent shoot (relay branch). Shade would have promoted the development of neoformed leaves. Under shade and low water availability, water use efficiency was higher in distal than proximal leaves. Under high sunlight and water availability, leaves of relay branches presented slightly higher Psat with higher water loss than both proximal preformed leaves and distal leaves under the other tested conditions. This study highlights the need of assessing intra-individual variations in shoot acclimation in relation to axis differentiation.
Palabras clave:
ACCLIMATION
,
ANNUAL SHOOTS
,
AXIS DIFFERENTIATION
,
PLASTICITY
,
PRIMARY GROWTH
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Licencia
Identificadores
Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos(INIBIOMA)
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Citación
Torres, Cristian Daniel; Magnin, Noel Amaru; Varela, Santiago Agustín; Stecconi, Marina; Grosfeld, Javier Edgardo; et al.; Morpho-physiological responses of Nothofagus obliqua to light intensity and water status, with focus on primary growth dynamics; Springer; Trees; 32; 5; 10-2018; 1301-1314
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