Abstract
Objective of this work was to estimate genetic parameters among and within potato clonal families for tuber yield, average tuber weight, tuber appearance and chip color. Twenty families were evaluated in spring 2003 and fall 2004 on the experimental field of Embrapa Clima Temperado, Pelotas, state of Rio Grande do Sul, Brazil. A randomized complete block design with three replications was used. The experimental unit consisted of ten clones represented in five plants each. ANOVA revealed significant differences among and within families for all traits, except for the genotype x growing season interaction. Two families had a superior mean and only one superior variance. The heritability and selection gain estimates among families were higher than within families for tuber appearance, average tuber weight and tuber yield. Only for chip color, heritability and selection gain the estimates among families were similar to the population estimates.
Highlights
Any breeding program depends on the availability of a superior population that contains the necessary genetic variability for the selection of new cultivars (Tai 1975).Potato breeding programs normally begin by obtaining hybrid families, produced in a greenhouse or on the field (Rodrigues and Pereira 2003)
For chip color, heritability and selection gain the estimates among families were similar to the population estimates
The resulting true potato seeds (TPS) have a potential for selection of improved clones since they combine parents with complementary traits, allowing the breeder to capitalize on heterosis
Summary
Any breeding program depends on the availability of a superior population that contains the necessary genetic variability for the selection of new cultivars (Tai 1975).Potato breeding programs normally begin by obtaining hybrid families, produced in a greenhouse or on the field (Rodrigues and Pereira 2003). Among the hundreds of new clones obtained from these crosses there will be some that combine the parental traits and will be selected, offering advantages over the grown cultivars (Pereira 2003). In order to have success in the identification of superior genotypes, a large number of clones has to be evaluated over two or three years, with a small chance of being selected. In this case, a selection of elite parents becomes necessary to increase the frequency of superior progenies and broaden the segregation at family level, which provides more information on the traits of interest (Swiezynski 1965, 1978)
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