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Genetic progress in the breeding population of Zeyheria tuberculosa (Ipê-felpudo): from theoretical predictions to clonal recombination orchard assembly

2021; Editora da Universidade de São Paulo; Volume: 49; Issue: 131 Linguagem: Inglês

10.18671/scifor.v49n131.18

2318-1222

Marlon dos Santos Pereira Birindiba Garuzzo, Andrei Caíque Pires Nunes, Aline Pinto dos Santos, Felipe Garbelini Marques,

Plant Physiology and Cultivation Studies

Zeyheria tuberculosa (Ipê-felpudo) is a promising timber species with high silvicultural potential, but genetic breeding of this species is incipient.In order to promote genetic breeding programs of Z. tuberculosa, this study aimed to: (a) characterize the genetic variability of the species via a progenies and provenances test; (b) select mother trees, potential parents, and potential clones; (c) evaluate genetic progression of future breeding populations; and (d) study the viability of the grafting process for the establishment of a clonal recombination orchard.The experiment consisted of a progeny and provenance test of Z. tuberculosa in the municipality of Porto Seguro, Southern Bahia State, Brazil.The test was composed of 30 open pollination families in a randomized block design with 10 blocks of singletree plots in 4 m × 4 m grids.The traits evaluated at 3.5 years of age were diameter at breast height (DBH) and stem quality.The Z. tuberculosa population of the test presented moderate genetic variability for DBH (individual heritability 0.26).Predicted genetic gains with selection of mother trees, potential parents and clones ranged from 6.29% to 75.99%, indicating success with selection.The simulation of open pollination between the ten best potential parents for DBH and stem shape estimated the genetic progress of the future population as being 20.51%.The ten best potential parent trees were cloned using a grafting technique in order to assemble a clonal controlled pollination orchard.The mean success rate of grafting was 51%, ranging from 20% to 80% according to genotype.Overall, our results demonstrated that genetic breeding of Z. tuberculosa should be considered, since genetic progress for stem growth is possible and clonal recombination orchards can be set up using grafting techniques.