Genetic evaluation of Pinus taeda clones from somatic embryogenesis and their genotype x environment interaction

Abstract

The objective of this study was to evaluate the genotype x environment interaction and to estimate the genetic components of variance and mean using mixed models in early selection of 238 clones of Pinus taeda propagated by somatic embryogenesis. The experiment consisted of a complete blocks design, with 12 replications, with one plant per plot, in four environments, at 1, 3, and 4 years of age. Estimates of heritability and of genetic gains in the evaluated environments showed good prospects for selection of superior genotypes. The effect of genotype x environment interaction was pronounced for all traits investigated. With the simultaneous selection for stability and adaptability, 10% genetic gain was obtained in relation to the mean of the commercial controls. This estimated gain indicates that the somatic embryogenesis technique has been effective in propagation of clones with good productive potential.

GENETIC SELECTION OF Pinus taeda L. THROUGH MULTI-ENVIRONMENT TRIAL

“…However, such an interaction can be more complex, because, despite the soil and climate factors, it can be related to origin, provenance, genetic material propagation form, among other factors. Dias et al (2018) carried out a clonal test with P. taeda, in individuals at the age of four years, and found low correlation (0.49) among the four tested locations. They mention that clonal trials tend to present higher genotype x environment interaction than trials planted with progenies originated from seeds.…”

“…Most P. taeda plantations in Brazil are originated from seedlings; thus, breeding programs are set to produce genetically improved seeds in seed orchards. Therefore, the genetic selection of individuals and use of the best silvicultural techniques are essential to get high productivity in multi-environmental situations (DIAS et al, 2018;DVORAK, 2012).…”

“…One single breeding zone can be defined, in case of no significant genotype x environmental interaction, in order to meet the demand for seeds in all tested environments (MARTINEZ et al, 2012). Significant genotype x environment interactions for P. taeda were found by Paludzyszyn Filho et al (2001), in half-sib progenies, and by Dias et al (2018) in test based on using clones obtained through somatic embryogenesis. Martinez et al (2012) did not detect significant genotype x environmental interaction between half-sib progenies, in a progeny trial with P. taeda.…”

Theobroma Grandiflorum Breeding Optimization Based on Repeatability, Stability and Adaptability Information

“…Understanding stability and adaptability enables the identification of productive, stable, and adaptable genotypes (Silva et al, 2019). However, evaluating GE interaction is one of the most costly aspects of a breeding program (Dias et al, 2018), especially for perennial fruit trees such as T. grandiflorum, where the breeding cycle can last up to 15 years (Alves et al 2021). This may explain why studies on GE interaction in T. grandiflorum are extremely rare.…”

Theobroma grandiflorum breeding optimization based on repeatability, stability and adaptability information

“…Understanding stability and adaptability enables the identification of productive, stable, and adaptable genotypes [19]. However, evaluating GE interaction is one of the most costly aspects of a breeding program [20], especially for perennial fruit trees such as T. grandiflorum, where the breeding cycle can last up to 15 years [21]. This may explain why studies on GE interaction in T. grandiflorum are extremely rare.…”