Fenologia reprodutiva da Araucaria angustifolia (Bert.) O. Ktze, na regiao de Curitiba - PR
Anselmini, Justina Ines
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The objective of this work was to describe morphologically and chronologically aspects of the reproductive biology of the Araucaria angustifolia, aiming to support future research on production increase of pine nuts and genetic improvement of the species. Male and female adult plants were evaluated. All individuals were found at the Sector of Agrarian Sciences of the UFPR, in Curitiba - PR. Collections and measurements of ginostrobili and androstrobili, and mature pine cones were made in 2003 and 2005 to describe the reproductive phenology of A. angustifolia. The reproductive structures were photographed in situ and in the laboratory under a microscope, at different periods of development. The diameter and the length of the pine cones were measured in 13 different times in both years to estimate their growth rate. In the environmental conditions of Curitiba, the pollination of the A. angustifolia occurs in September and October. The androstrobilus formation begins in November, and the pollen dispersion occurs in September and October in a cycle of 10 to 11 months. The ginostrobilus formation occurs in November; its polinization is in September and October of the following year and the pine nuts are mature 20 months later, from April until September, in a cycle of 29 to 34 months. The pine cones of the secondary branches are smaller and more rounded than the pine cones of the primary branches. The size of the pine nuts does not affect their germination rate. Maximum pine cone growth is achieved during two periods, e from September to January, after polinization, and from August to February of the following year.
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