Abstract

VENEGAS, G. A.; LOEWE, V.  and  GONZALEZ GONZALEZ, M.. Influence of length and diameter shoot growth in Pinus pinea L. flowering. Quebracho (Santiago del Estero) [online]. 2013, vol.21, n.1, pp.5-15. ISSN 1851-3026.

The aim of this study was to determine the influence of the length and diameter of apical vegetative shoots in female flowering and to verify polycyclic growth in a Pinus pinea plantation located in central Chile. The experiment was conducted in a plantation of 16 years six European origins, located in Casablanca district, Valparaíso Region. We randomly selected six trees per provenance and from each tree we chose a secondary branch, for a total of 72 branches analyzed. 13 measurements were performed monthly between September 2010 and November 2011, evaluating the length and diameter of the apical buds of the 2010 and 2011. In the last measurement was determined the type of shoot expressed (new shoot), reproductive (male or female flower) or vegetative. Results show that shoot length of years 2010 and 2011 was not related to producing female flowers, unlike diameter, found that larger diameter increases the chances of producing female strobili. In addition, 1.38% of the branches studied had a second growth in summer (polycyclic growth), interpreting this phenomenon does occur in the species at the site studied, but in a very low level.

Keywords : Shoot growth; Flowering; Polycyclic growth; Pinus pinea.

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