INVESTIGADORES
DEL FUEYO Georgina Marisa
artículos
Título:
Cone and ovule development in the Podocarpus species from Argentina
Autor/es:
GEORGINA M. DEL FUEYO
Revista:
PHYTOMORPHOLOGY
Editorial:
Ultimate Printers
Referencias:
Lugar: New Delhi; Año: 1999 vol. 49 p. 49 - 60
ISSN:
0031-9449
Resumen:
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This paper describes the development of female
cone, megasporogenesis, megagametogenesis, pollen germination and embryogenesis
of three native species of Podocarpus
from Argentina. During the first stage the primordium of the ovule is covered
by the bracts. The megaspore mother cell gives rise to a lineal tetrad. The
chalazal megaspore is functional which undergoes free nuclear divisions. An
archegonial complex with five to six archegonia is originated in the female
gametophyte. After pollination, fertilization takes place, and an embryo with
two cotyledons is formed. The reproductive process describes here show a
similar pattern of development as in most of the conifers.
