Abstract

IGLESIAS, LG; SOLIS-RAMOS, LY  and  VIVEROS-VIVEROS, H. Morphometric variation in two natural populations of Pinus hartwegii Lindl. at Veracruz State. Phyton (B. Aires) [online]. 2012, vol.81, n.2, pp.239-247. ISSN 1851-5657.

The morphometric variation of cones, seeds and needles was evaluated in two natural populations of Pinus hartwegii at Veracruz state to estimate the percentage of phenotypic variation due to diferences among populations and trees within populations. In addition, multivariate principal components, cluster and discriminate analysis was conducted to characterize the populations. Most of the traits measured on cones, seeds and needles showed significant variation both among populations and among trees within populations. Measurements of cone and seed traits used as indicators of the genetic and reproductive status of two natural populations of P. hartwegii revealed that much of the variation was mainly detected among trees within populations. Cone characters showed that the variance distributed both among and within populations. Leaf traits showed a greater percentage of variation among than within tree populations, indicating that these traits are strongly infuenced by the environment. Results from the principal component and cluster analysis did not allow to diferentiate clearly both populations. The most important discriminatory variable between populations was the cone length; an eficiency of 70% in the classification of the trees from both populations was obtained on this basis. The overall results agree that there is little diferentiation in morphological characters among the examined populations, and that most of the variation was detected within populations.

Keywords : Morphometric variation; Populations; Pinus hartwegii; Conifers.

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