Abstract
Abstract: The objective of this work was to evaluate the genotype x environment (GxE) interaction in open-pollinated Eucalyptus saligna progenies for simultaneous selection for greater stability and adaptability for wood volume, as well as to compare the selection strategies through combined and individual analyses in three environments. Three experiments were conducted in a randomized complete block design, with four replicates and six plants per plot, with 102 to 122 progenies. Three years after planting, survival rate and wood volume were evaluated. The genetic parameters were estimated by the maximum restricted likelihood and best linear unbiased prediction (REML/Blup) methods, and the stability and adaptability analysis was conducted using the harmonic mean of the relative performance of genetic values (HMRPGV). The highest survival rate (82%) was observed in Sabinópolis and the highest volume (120 m³ ha-1) in Lençóis Paulista. The mean heritability of progenies for the two analyzed variables was considered high, and the genetic correlations between survival rate and volume were weak for all sites. The G×E interaction was significant and of the complex type, with genotype correlation between sites of 47%, indicating that the ranking of the best progenies differed in each studied environment. The analysis of stability and adaptability indicated the possibility of selecting progenies with good performance in the three environments; however, to improve the quality of the evaluated characteristics, it is necessary to select specific progenies for each environment.
Highlights
Eucalyptus saligna Sm. is a species of Australian origin, where it is known by the name Sydney blue gum
In Brazil, the species has been of great importance; due to its demand for good soil conditions, it has become less interesting than Eucalyptus urophylla S.T.Blake and E. grandis (Ferreira, 2016), despite the good climatic suitability for the species in the Southern and Southeastern regions of Brazil (Flores et al, 2016)
The mean annual increment (MAI) in wood volume was 29.7, 30.1, and 39.7 m3 ha-1 per year in Sabinópolis, Belo Oriente, and al., 2013; Silva et al, 2013), i.e., genotypes with a high selection intensity, different from the seminal material evaluated in the present study
Summary
Eucalyptus saligna Sm. is a species of Australian origin, where it is known by the name Sydney blue gum. It is found in regions of subtropical and temperate climates, at altitudes of up to 1,100 m, and is often confused with Eucalyptus grandis W.Hill (Flores et al, 2016). In Brazil, the species has been of great importance; due to its demand for good soil conditions, it has become less interesting than Eucalyptus urophylla S.T.Blake and E. grandis (Ferreira, 2016), despite the good climatic suitability for the species in the Southern and Southeastern regions of Brazil (Flores et al, 2016). A study on 36-month-old progenies of this species in the Brazilian states of São Paulo, Minas Gerais, and Rio Grande do Sul showed a mean annual increment (MAI) ranging from 24 to 31 m3 ha-1 per year in General Câmara, in the state of Rio Grande do Sul; from 30 to 33 m3 ha-1 per year in Brotas, in the state of São Paulo; and from 27 to 32 m3 ha-1 per year in Bom Despacho, in the state of Minas Gerais (Mori et al, 1986)
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