Genotypic evaluation of accessions and individual selection in Stylosanthes spp. by simulated BLUP method

Abstract

Genetic improvement programs of perennial forage legumes in Brazil evaluate accessions in row plots withoutconsidering the genetic variability within accessions. Individual plant evaluations would not only allow for selection of the bestaccessions but also for the best individuals within accessions. This procedure is however more labor-intensive and expensive.The effectiveness of using the simulated individual BLUP selection method (BLUPIS) was assessed in a trial with Stylosanthescapitata and S. guianensis in a completely randomized block design with 35 accessions, six plants per plot and six and fivereplications, respectively. The method can be applied when only total plot yields are measured and provide selection at theindividual plant level. Results showed a high correlation between selection by the traditional BLUP and the alternativeBLUPIS methods. The latter is recommended for improving species in which individual plant evaluations are difficult.

Keywords

• plant breeding
• forage legume
• Stylosanthes capitata
• Stylosanthes guianensis.