Herdabilidade do conteúdo de proteína total em batata diploide Solanum tuberosum grupo Phureja

Abstract

In recent years, genetic studies that supports the plant breeding program for improve the nutritional value of potato tuber have been very important. Solanum tuberosum Group Phureja is a species with high potential for exportation and better nutritional characteristics than species from other groups. In this research we estimate de heritability by variance components based on analysis of variance, parent offspring regression, restricted maximum likelihood and bayesian estimation. The total protein content was assessed in 103 sib maternal families. For this purpose we determined the total nitrogen by the Kjeldahl method and the protein conversion factor was used. The estimates were 0.35, 0.28, 0.40 and 0.41 respectively. According to the heritability estimates and supposing a moderate selection pressure (20%), increments in protein content from0.55% to 0.78% could be obtained by each selection cycle.