Selection of Eucalyptus grandis families across contrasting environmental conditions

Abstract

The objective was to select productive and stable E. grandis families across contrasting sites in Brazil and Uruguay. Survival and growth of 130 open pollinated families were evaluated three years after planting. Survival ranged from 28 to 89% and mean annual increment from 20.5 to 48.4 m 3 hay-1. Low productivity in one site was attributed to unusually low rainfall and in the other, because of Cylindrocladium leaf disease. Heritability among families and the correlation family by environment were intermediate. Genetic pairwise correlations ranged from 0.03 to 0.81 across sites. The lowest genetic correlation between sites was observed where Cylindrocladium leaf disease occurs. Selection of top families across sites allowed selecting the best ones in each site. However, the effect of genotype-environment interactions was observed where climatic conditions are not adequate to the E. grandis, favoring the occurrence of Cylindrocladium disease.

Genotype x Environment interaction, stability, and adaptability in progenies of Eucalyptus urophylla S.T. BLAKE using the AMMI model

“…Therefore, 32 progenies (25.4 %) can be considered stable and productive, presenting favorable traits for selection and recommendation due to the simple GxE interaction for these progenies. These results are similar to those observed for E. grandis progenies in five experiments established between latitudes 08o 89' to 32°10' in Brazil and Uruguay (Silva et al, 2018).…”

“…In our case, levels of rainfall lower than the annual average during the study years may have caused the stability in Itamarandiba (2010 = 965 mm; 2011 = 915 mm; annual historic average of 1100 mm) (Inmet, 2017). Similarly, E. grandis families in Itamarandiba, under moderate and prolonged water stress, showed lower productivity levels of the stand and reduced environmental effects on the variation of the phenotype (Silva et al, 2018). Genotype management in a stable environment is more reliable since the genotype ranking will be determined primarily by genotypic effects (Duarte and Vencovsky, 1999).…”

Early silvicultural performance of eucalypt species grown in environmental conditions of the tropical dry forest of Colombia

“…Our results agree with those reported by Silva, et al (2019a;2019b) when evaluating survival and growth in 3-year progeny trials of E. urophylla and E. grandis in different climatic zones of Brazil. These authors reported a survival rate of 51 % to 92 % and an MAI of 19 to 46 m 3 •ha -1 •year -1 for E. urophylla and of 28 to 89 % and 20.5 and 48.4 m 3 • ha -1 •year -1 for E. grandis.…”

CS58: new high yielding, salt and alkaline tolerant cultivar of Indian mustard

“…Selection of elite germplasm in intermediate climatic growing conditions allows selection of a suitable germplasm across the diverse range of climatic conditions evaluated (da Silva et al 2019). One approach is characterization of the available germplasm in salt affected environment, which provide an initial germplasm base for breeding salt-tolerant crops.…”