INVESTIGADORES
PUNTIERI javier Guido
artículos
Título:
Bud and growth-unit structure in seedlings and saplings of Nothofagus alpina (Nothofagaceae).
Autor/es:
PUNTIERI, J., GROSFELD, J., STECCONI, M., BRION, C. Y BARTHÉLÉMY, D.
Revista:
AMERICAN JOURNAL OF BOTANY
Editorial:
Botanical Society of America
Referencias:
Lugar: Stanford; Año: 2007 vol. 94 p. 1382 - 1390
ISSN:
0002-9122
Resumen:
In temperate trees, axis length growth generally results from the differentiation of organs at the end of a growing season and the
extension of such preformed organs in the next growing season. Neoformation, i.e., the simultaneous differentiation and
extension of organs, has been studied for only a few species. Here we evaluated bud composition and growth unit (GU) size for
seedlings and saplings of Nothofagus alpina, a valuable South American forest tree. Trunk GUs of seedlings and saplings
included preformed and neoformed organs, whereas main-branch GUs of saplings were entirely preformed. The size of a GU was
more closely related to the number of preformed green leaves than to the number of cataphylls of its preceding bud. Proximal buds
of a trunk GU had more cataphylls and less green-leaf primordia than distal buds. Individual leaf area increased from proximal to
distal positions on trunk GUs. For trunk and main-branch GUs, the length/width ratio was maximum for leaves in intermediate
positions. The development of large neoformed leaves at the end of the growing season could increase the photosynthetic capacity
of this species in late summer, when the activity of preformed organs is likely to be decreasing.
included preformed and neoformed organs, whereas main-branch GUs of saplings were entirely preformed. The size of a GU was
more closely related to the number of preformed green leaves than to the number of cataphylls of its preceding bud. Proximal buds
of a trunk GU had more cataphylls and less green-leaf primordia than distal buds. Individual leaf area increased from proximal to
distal positions on trunk GUs. For trunk and main-branch GUs, the length/width ratio was maximum for leaves in intermediate
positions. The development of large neoformed leaves at the end of the growing season could increase the photosynthetic capacity
of this species in late summer, when the activity of preformed organs is likely to be decreasing.
extension of organs, has been studied for only a few species. Here we evaluated bud composition and growth unit (GU) size for
seedlings and saplings of Nothofagus alpina, a valuable South American forest tree. Trunk GUs of seedlings and saplings
included preformed and neoformed organs, whereas main-branch GUs of saplings were entirely preformed. The size of a GU was
more closely related to the number of preformed green leaves than to the number of cataphylls of its preceding bud. Proximal buds
of a trunk GU had more cataphylls and less green-leaf primordia than distal buds. Individual leaf area increased from proximal to
distal positions on trunk GUs. For trunk and main-branch GUs, the length/width ratio was maximum for leaves in intermediate
positions. The development of large neoformed leaves at the end of the growing season could increase the photosynthetic capacity
of this species in late summer, when the activity of preformed organs is likely to be decreasing.
included preformed and neoformed organs, whereas main-branch GUs of saplings were entirely preformed. The size of a GU was
more closely related to the number of preformed green leaves than to the number of cataphylls of its preceding bud. Proximal buds
of a trunk GU had more cataphylls and less green-leaf primordia than distal buds. Individual leaf area increased from proximal to
distal positions on trunk GUs. For trunk and main-branch GUs, the length/width ratio was maximum for leaves in intermediate
positions. The development of large neoformed leaves at the end of the growing season could increase the photosynthetic capacity
of this species in late summer, when the activity of preformed organs is likely to be decreasing.
preformed organs in the next growing season. Neoformation, i.e., the simultaneous differentiation and
extension of organs, has been studied for only a few species. Here we evaluated bud composition and growth unit (GU) size for
seedlings and saplings of Nothofagus alpina, a valuable South American forest tree. Trunk GUs of seedlings and saplings
included preformed and neoformed organs, whereas main-branch GUs of saplings were entirely preformed. The size of a GU was
more closely related to the number of preformed green leaves than to the number of cataphylls of its preceding bud. Proximal buds
of a trunk GU had more cataphylls and less green-leaf primordia than distal buds. Individual leaf area increased from proximal to
distal positions on trunk GUs. For trunk and main-branch GUs, the length/width ratio was maximum for leaves in intermediate
positions. The development of large neoformed leaves at the end of the growing season could increase the photosynthetic capacity
of this species in late summer, when the activity of preformed organs is likely to be decreasing.
included preformed and neoformed organs, whereas main-branch GUs of saplings were entirely preformed. The size of a GU was
more closely related to the number of preformed green leaves than to the number of cataphylls of its preceding bud. Proximal buds
of a trunk GU had more cataphylls and less green-leaf primordia than distal buds. Individual leaf area increased from proximal to
distal positions on trunk GUs. For trunk and main-branch GUs, the length/width ratio was maximum for leaves in intermediate
positions. The development of large neoformed leaves at the end of the growing season could increase the photosynthetic capacity
of this species in late summer, when the activity of preformed organs is likely to be decreasing.
Nothofagus alpina, a valuable South American forest tree. Trunk GUs of seedlings and saplings
included preformed and neoformed organs, whereas main-branch GUs of saplings were entirely preformed. The size of a GU was
more closely related to the number of preformed green leaves than to the number of cataphylls of its preceding bud. Proximal buds
of a trunk GU had more cataphylls and less green-leaf primordia than distal buds. Individual leaf area increased from proximal to
distal positions on trunk GUs. For trunk and main-branch GUs, the length/width ratio was maximum for leaves in intermediate
positions. The development of large neoformed leaves at the end of the growing season could increase the photosynthetic capacity
of this species in late summer, when the activity of preformed organs is likely to be decreasing.