Resumo

CAMBRON-SANDOVAL, Víctor Hugo; SUZAN-AZPIRI, Humberto; SAENZ-ROMERO, Cuauhtémoc  e  SANCHEZ-VARGAS, Naúm M.. Development of Pinus pseudostrobus under different environments of growth in common garden. Madera bosques [online]. 2014, vol.20, n.1, pp.47-57. ISSN 2448-7597.

From a principal component analysis (PCA), is is proposed the interpretation and classification of three main environments competition on the development of individuals of P. pseudostrobus integrating previous results within the same trial. The variables were: growth (height and base diameter), chlorophyll production (chlorophyll pigments total, a, b and the ratio a/b), survival, production and distribution of dry weight biomass (total biomass of root, branch, leaf and stem) and growth architecture (length of branch insertion height and the lowest branch on the stem). All variables were measured in half-sibling families of P. pseudostrobus in a common garden test for 10 months-old seedlings in three competitive environments: (I) inter-family of low density (0.24 × 0.12 m), (II) inter-family of high density (0.12 × 0.06 m) and (III) intra-family with high density (0.12 × 0.06 m). The first three components (PC) explained 82.9% of the total variation. The growth was the major component (PC1), grouping families for competitive environments as PC2 with families grouped by survivability and physiological plasticity, and finally, architectural structural changes as PC3. The results showed a high level of phenotypic plasticity of P. pseudostrobus, and emphasize the importance of the selection of environments and genotypes consistent to enhance adaptation and productivity improvement programs.

Palavras-chave : Principal component analysis; competition; growth strategy; stress.

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