Seleção precoce de híbridos de eucalipto tolerantes ao déficit hídrico, a pragas e doenças

Gustavo Baesso; Camila Ferreira Paixão; Gleison Augusto dos Santos; Genaina Aparecida de Souza; Guilherme Bravim Canal; Thaline Martins Pimenta; Karine Fernandes Caiafa; André Peixoto Lorenzoni

doi:10.53661/1806-9088202448263765

Authors

Gustavo Baesso Pólen Engenharia Florestal, Viçosa, MG - Brasil https://orcid.org/0000-0002-6965-6249
Camila Ferreira Paixão Universidade Federal de Viçosa, Programa de Pós-Graduação em Ciência Florestal, Viçosa, MG - Brasil https://orcid.org/0009-0004-9922-4588
Gleison Augusto dos Santos Universidade Federal de Viçosa, Departamento de Engenharia Florestal, Viçosa, MG - Brasil https://orcid.org/0000-0002-0773-810X
Genaina Aparecida de Souza Universidade Federal de Viçosa, Programa de Pós-Graduação em Ciência Florestal, Viçosa, MG - Brasil https://orcid.org/0000-0002-0547-3451
Guilherme Bravim Canal Universidade Federal de Viçosa, Programa de Pós-Graduação em Ciência Florestal, Viçosa, MG - Brasil https://orcid.org/0000-0002-2691-1270
Thaline Martins Pimenta Universidade Federal de Viçosa, Programa de Pós-Graduação em Ciência Florestal, Viçosa, MG - Brasil https://orcid.org/0000-0002-5002-177X
Karine Fernandes Caiafa Universidade Federal de Viçosa, Viçosa, MG - Brasil https://orcid.org/0000-0002-0788-0405
André Peixoto Lorenzoni Universidade Federal de Viçosa, Programa de Pós-Graduação em Ciência Florestal, Viçosa, MG - Brasil https://orcid.org/0009-0007-1357-3333

DOI:

https://doi.org/10.53661/1806-9088202448263765

Keywords:

Water deficit, Drought tolerance, Pest tolerance

Abstract

The objective of this study was to perform early selection of the best progenies for traits related to tolerance to water deficit, pests, and diseases in Eucalyptus progeny tests. The experimental trials were set up in a randomized block design, with one plant per plot, and 20 replicates across three distinct locations (Buritizeiro/MG, Bocaiúva/MG, and Inhambupe/BA). At 6 months of age, the tested families were evaluated in terms of mean annual increment (MAI) and tolerance to pests and diseases. The analyses were conducted based on the genetic-statistics procedure of mixed models via REML/BLUP. The selection process was based on the estimated genetic values for the families, associating both traits in analyses using selection indices, namely the Multiplicative Selection Index and the Mulamba and Mock Selection Index, which allowed simultaneous selection for productivity (MAI) and tolerance to biotic agents. In Buritizeiro/MG and Bocaiúva/MG, plant tolerance to the psyllid (Glycaspis brimblecombei) was evaluated, while in Inhambupe/BA, tolerance to eucalyptus rust (Austropuccinia psidii) was assessed. For the trait of tolerance to biotic agents, heritabilities (h_g²) were moderate across the three sites, with values of 0.20, 0.26, and 0.24 in Buritizeiro, Bocaiúva, and Inhambupe, respectively. The use of the Multiplicative Index (MI) and Mulamba and Mock Index (MMI) enabled the selection of genetic materials with better performance for both traits simultaneously.

Keywords: Water deficit; Drought tolerance; Pest tolerance