CONICET | Buscador de Institutos y Recursos Humanos

This work aimed to evaluate radial variation of tracheid morphology for hybrid pines. Radial increments cores were extracted from trees of hybrid pine F1 INTA-PINDO in two trials. The samples were taken at 1,30 m in height, they were dissociated, and the anatomical characteristics of individual tracheids obtained from the latewood fraction of growth rings 4, 7, 10, and 11 were measured by optical microscopy with image analysis. To obtain the microfibrillar angle, the technique through individual tracheid pit apertures was used. For microfibrillar angle within each age, significant statistical differences were found between sites and families for a confidence level of 95%, whereas the variations were not significant for others studied properties. Important changes with considered ages were observed in the cell morphology of the tracheids. The mean values of microfibrillar angle, lumen width, and the total width of tracheids decreased with age, regardless of sites and evaluated families. The mean values of cell wall-thickness and cell-wall ratio increased with age. These results indicate that wood properties would not be uniform in the radial direction and they must be taken into account for certain uses. Families with better growth performance and desirable parameters for structural wood quality were identified. The outstanding families belong to the best positions of growth genetic ranking. It is concluded that at 11 years old, this taxon produces mature wood, due to the characteristics of its cell morphology.

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