CLONAL SELECTION AND GENOTYPE-BY-ENVIRONMENT INTERACTION IN EUCALYPTUS FOR SUSTAINABLE FORESTRY IN ALAGOAS
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Abstract
Background: The expansion of clonal eucalypts forestry into new forest frontiers in Northeastern
Brazil requires selecting genotypes adapted to local conditions, thereby reducing pressure on native
biomes such as the Caatinga. This study evaluated genotype-by-environment (G×E) interaction
across four sites in Alagoas State based on mean annual increment (MAI) and survival (SUR) using
40 clones. The REML/BLUP, HMRPGV, and GGE biplot methodologies were applied, and following
the analyses, an empirical index combining MAI and survival rate was employed for clone selection.
Results: A significant G×E interaction was detected, enabling the identification of two breeding
zones and two mega-environments. Clones with high productive potential were selected. The
HMRPGV method resulted in the highest genetic gain, while adjusting MAI by survival rate reshaped
clone ranking and selection outcomes.
Conclusions: These findings provide robust recommendations for Alagoas, fostering efficient land
use, reducing pressure on the Caatinga biome, and supporting the sustainable expansion of the
regional forest base.
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