Estimates of genetic parameters for physic nut traits based in the germplasm two years evaluation

• Autor(a) principal: Laviola,Bruno Galvêas
• Data de Publicação: 2012
• Outros Autores: Alves,Alexandre Alonso, Gurgel,Fábio de Lima, Rosado,Tatiana Barbosa, Rocha,Rodrigo Barros, Albrecht,Julio Cesar
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Ciência Rural
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782012000300008
• topic: Jatropha curcas; plant breeding; quantitative genetic

In spite of increasingly widespread interest in planting physic nut, breeding efforts are still in its infancy. In that context, an important resource recently established aiming future breeding efforts was the assembly of a germplasm bank with near 200 accessions. The objective of this study was to estimate genetic parameters, repeatibility coefficients and genetic correlation between seven traits, measured in 110 accessions (half sib families) of this germplasm bank in different stages of development. The results show that higher relative values of additive variance were only found for yield and height, and the existence of low environmental variation (either of temporary or permanent nature) among plots within blocks. Given the high repeatibility values found for all traits, on average three measurements are necessary to predict, accurately and efficiently, the true breeding value of an individual. Based on the results of genetic correlations, breeding effort should initially be use track trees with increased stem diameter, elevated number of branches and canopy volume so as to increase the chances of finding an exceptionally highly productive tree.