Abstract
Background: Eucalyptus dorrigoensis withstands cold weather and the occurrence of frost, making it a potential species for improvement programs in Southern Brazil where such conditions occur. However, the use of the species is still uncommon and its genetic variability remains poorly understood.d. Results: For site called Sertão Santana, the narrow sense heritability ranged from 0.46 (H) to 0.64 (MAI) and for Lavras do Sul it ranged from 0.38 (H) to 0.47 (MAI). The coefficient of genetic variation varied from 8.1% (H) to 26.1% (MAI). There is significant genetic correlation between DBH and MAI, reaching a value of 0.97. The GxE interaction was significant and mostly complex (78.7%). The best genetic materials for each environment, along with the most stable genetic materials, were identified. In addition, a thinning simulation was performed and the genetic gains for Sertão Santana and Lavras do Sul were 12.62 and 7.43%, respectively. Conclusion: The studied populations have genetic variability that can be used in breeding programs by selecting among progenies and individuals within progenies. The GxE interaction is complex, and as such, the best genetic material should be selected independently for each site. The results of this study have practical implications for the companies and offer advances in knowledge of the species for breeding programs.
Highlights
The planting of exotic tree species has brought significant social and economic benefits to Brazil, including positive impacts on the industrial sector
The selection of a potential species is the first step in improvement programs, which involves selecting species that are resistant to environmental conditions, such as cold and dry weather, drought, and frost, while maintaining high levels of productivity and adequate wood properties
Johnson & K.D.Hill withstands cold weather and the occurrence of frost, making it a potential species for improvement programs, since these conditions occur in Southern Brazil (Arnold, 2015; Kronzen et al, 2017)
Summary
The planting of exotic tree species has brought significant social and economic benefits to Brazil, including positive impacts on the industrial sector. Among the most common exotic genera used, Eucalyptus is the most important and offers advantages due to the advancement of genetic studies (Grattapaglia et al, 2012). In terms of forestry, about 7.84 million hectares in Brazil are covered by forest plantations, of which about 5.7 million are planted with Eucalyptus species, underscoring the importance of this genus in the national context (IBÁ, 2019). Eucalyptus dorrigoensis (Blakely) L.A.S. Johnson & K.D.Hill withstands cold weather and the occurrence of frost, making it a potential species for improvement programs, since these conditions occur in Southern Brazil (Arnold, 2015; Kronzen et al, 2017). Eucalyptus dorrigoensis withstands cold weather and the occurrence of frost, making it a potential species for improvement programs in Southern Brazil where such conditions occur. The use of the species is still uncommon and its genetic variability remains poorly understood.d
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