418
mothers and progenies for backward and forward selection in the future. In the long
term, the expectation is to promote crossings for the generation of new variability,
being the basis for the improvement of the species.
With the main objective of producing improved seeds, the first Clonal Seed
Orchard (CSO) of A. angustifolia from Argentina is being installed since 2015 in
Manuel Belgrano Forest Station. It also functions as a genetic bank of the species
for conservation purposes. The genotypes that constitute this CSO correspond to the
best female and male individuals of a phenotypic ranking, which includes all the
selections made up to the present. The propagation of genotypes was carried out by
grafting, using sprouts from primary branches with an orthotropic tendency as scions (Fig.  15.11c). The technique of full apical insertion was used on 2-year-old
Fig. 15.12 Diametric distribution of base and selected population of A. angustifolia. S: selection
differential
Fig. 15.13 Progeny test of A. angustifolia installed in Manuel Belgrano Forest Station at 4 years
of age. (Photos: Mario Pastorino)
M. E. Gauchat et al.