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A novel statistical method for assessing SSR variation in autotetraploid alfalfa (Medicago sativa L.) Genet. Mol. Biol.
Liu,Zhi-Peng; Liu,Gong-She; Yang,Qing-Chuan.
The level of variation of simple sequence repeat (SSR) markers in cultivated alfalfa from American, Australian and Chinese sources was evaluated using a novel autotetraploid statistical method to calculate the effective number of alleles, the allele frequencies and heterozygosity. We used 19 SSR primers to screen seven polymorphic SSR loci in 320 plants from eight populations. The genetic distance and phylogenetic analysis (DISPAN) program was used to calculate the inter- and intra-population genetic relationships using the conventional binary absence/presence (0/1) method and our novel autotetraploid method. The autotetraploid method resulted in significantly higher heterozygosity (p < 0.01), average effective number (p < 0.01) and lower standard...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Autotetraploid; Genetic variation; Medicago sativa L.; SSR; Statistical genetics.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000300015
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Selection in several environments by BLP as an alternative to pooled anova in crop breeding Ciência e Agrotecnologia
Bueno Filho,Júlio Sílvio de Sousa; Vencovsky,Roland.
Plant breeders often carry out genetic trials in balanced designs. That is not always the case with animal genetic trials. In plant breeding is usual to select progenies tested in several environments by pooled analysis of variance (ANOVA). This procedure is based on the global averages for each family, although genetic values of progenies are better viewed as random effects. Thus, the appropriate form of analysis is more likely to follow the mixed models approach to progeny tests, which became a common practice in animal breeding. Best Linear Unbiased Prediction (BLUP) is not a "method" but a feature of mixed model estimators (predictors) of random effects and may be derived in so many ways that it has the potential of unifying the statistical theory of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: BLP; Plant breeding; Statistical genetics.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000500021
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