INVESTIGADORES
PUNTIERI javier Guido
artículos
Título:
Growth-unit structure in trees: effects of branch category and position in Nothofagus nervosa, N. obliqua and their hybrids (Nothofagaceae)
Autor/es:
PUNTIERI, JAVIER GUIDO; GHIRARDI, SOLEDAD
Revista:
TREES-STRUCTURE AND FUNCTION
Editorial:
SPRINGER
Referencias:
Lugar: Berlín; Año: 2010 vol. 24 p. 657 - 665
ISSN:
0931-1890
Resumen:
In plants with rhythmic growth, a branch segment
extended in one event is known as growth unit (GU).
GU structure, resulting from the resources allocated to stem
length, volume and mass, and to leaf area and mass, is
relevant for understanding branch functioning in the context
of plant development. This study compares GU
structure between main branches and short branches positioned
at low and high positions on nursery-grown trees of
three closely related genetic entities: Nothofagus nervosa,Nothofagus nervosa,
N. obliqua and natural hybrids between these species. GUs
of short branches, compared to those of main branches, had
lower length, diameter and number of leaves, and higher
specific leaf area (SLA), stem density and proportional
mass in leaves than in stems. GUs at high position on the
trees had a higher proportion of their mass in stem than in
leaves and a lower SLA than those at low position. Stem
density was higher for N. nervosa and the hybrid trees than
for N. obliqua. Most other GU traits did not differ statistically
between the considered genetic entities. The three
genetic entities exhibited distinct patterns of variation in
leaf size with leaf position along main-branch GUs. The
individual tree had a significant effect on most variables.
GU structure would have a major ontogenetic component
and would play a relevant role in the architecture of
Nothofagus species and their adaptation to different environmental
conditions.
Nothofagus species and their adaptation to different environmental
conditions.
conditions.and natural hybrids between these species. GUs
of short branches, compared to those of main branches, had
lower length, diameter and number of leaves, and higher
specific leaf area (SLA), stem density and proportional
mass in leaves than in stems. GUs at high position on the
trees had a higher proportion of their mass in stem than in
leaves and a lower SLA than those at low position. Stem
density was higher for N. nervosa and the hybrid trees than
for N. obliqua. Most other GU traits did not differ statistically
between the considered genetic entities. The three
genetic entities exhibited distinct patterns of variation in
leaf size with leaf position along main-branch GUs. The
individual tree had a significant effect on most variables.
GU structure would have a major ontogenetic component
and would play a relevant role in the architecture of
Nothofagus species and their adaptation to different environmental
conditions.
Nothofagus species and their adaptation to different environmental
conditions.
conditions.N. nervosa and the hybrid trees than
for N. obliqua. Most other GU traits did not differ statistically
between the considered genetic entities. The three
genetic entities exhibited distinct patterns of variation in
leaf size with leaf position along main-branch GUs. The
individual tree had a significant effect on most variables.
GU structure would have a major ontogenetic component
and would play a relevant role in the architecture of
Nothofagus species and their adaptation to different environmental
conditions.
Nothofagus species and their adaptation to different environmental
conditions.
conditions.N. obliqua. Most other GU traits did not differ statistically
between the considered genetic entities. The three
genetic entities exhibited distinct patterns of variation in
leaf size with leaf position along main-branch GUs. The
individual tree had a significant effect on most variables.
GU structure would have a major ontogenetic component
and would play a relevant role in the architecture of
Nothofagus species and their adaptation to different environmental
conditions.
Nothofagus species and their adaptation to different environmental
conditions.
conditions.