A comparison of deterministically predicted genetic gains with those realised in a South AfricanEucalyptus grandisbreeding program

Abstract

of genetic gains did deviate (in both directions) from those realised, although these deviations may be explained as functions of imperfect modelling. On average, however, the predicted genetic gains for tree volume over three generations was 13% between generations, whereas the average realised genetic gain in the genetic gains trial was 14%. It is therefore assumed that the E. grandis breeding population is indeed performing as expected, following classical tree breeding assumptions.

Contribución al conocimiento de las semillas de cinco especies forestales nativas y dos exóticas de Córdoba, Colombia

“…Existen diversos reportes de varios países sobre intensidad de selección y ganancias gené cas importantes para varios caracteres de interés del árbol en diferentes especies forestales (Kumar & Matharoo, 2003a;Kumar & Matharoo, 2003b;Botrel et al, 2007;SangUrk et al, 2007;Blada & Popescu, 2008;Oh et al, 2008;Rocha et al, 2009;Verryn et al, 2009;Vallejos et al, 2010;Murillo, 2011;Godoy & Rosado, 2011;Pavlotzky-Blank & MurilloGamboa, 2012;Mora & Saavedra, 2012;Verardi et al, 2013). En Colombia se han reportado con base en el uso de semilla botánica ganancias gené cas esperadas variables, para caracteres como el DAP, altura total y forma del fuste en varias especies na vas: Alnus jorullensis Kunth; Cariniana pyriformis Miers; Cordia alliodora (Ruiz & Pav.…”

Genetic parameter estimates and parental selection in Eucalyptus longirostrata and Corymbia henryi populations tested in South Africa

“…Therefore, a greater number of superior individuals are included in this Realistic scenario, leading to higher predicted gains. Up to eight superior trees could be selected from the best families in this scenario, and the predicted gains formula used does not take into account the unbalanced number of individuals selected per family (VERRYN et al, 2007).…”

The influence of tree improvement and cultural practices on the productivity ofEucalyptusplantations in temperate South Africa

“…Wagner et al (2006) reviewed four vegetation management trials with Eucalyptus genotypes in South Africa and estimated between 46 and 95 m 3 ha -1 increase in wood volume at rotation age through good vegetation management compared to untreated controls. In a detailed study of E. grandis, Verryn et al (2007) estimated an average improvement of 27% in tree volume of the second generation over the unimproved breeding material. On average, realised genetic gains between generations from genetic gains trials was estimated at 14%.…”