Abstract
Antisymmetry in female strobili of Pinus taeda
Highlights
A phenomenon closely related to phyllotaxis is antisymmetry, the presence of alternative orientations of the asymmetric structures (Palmer, 2005)
In order to test if there is a genetic predisposition toward a given orientation, we collected an additional 20-50 pines from each of five trees (Figure 1)
A total of 244 clockwise and 256 counter-clockwise were collected and scored, indicating the lack of a statistically significant bias toward any given orientation (χ2 = 0.28, p = 0.59). Both orientations were as frequent in cones of the same trees (Table 1), indicating that, contrary to other asymmetries such as the apical-basal axis, which are strongly influenced by ma
Summary
A phenomenon closely related to (but conceptually independent from) phyllotaxis is antisymmetry, the presence of alternative orientations of the asymmetric structures (Palmer, 2005). Collections were carried out in March 31, 2006 in the campus of the Universidade Federal do Paraná, in Curitiba, in Southern Brazil.
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