Genetics and Breeding
Genetic variation within globe artichoke landraces contributes to the variable yield performance detected in cultivation. It was built up over many generations of vegetative propagation as a consequence of the limited selection applied by farmers as well as the accumulation of mutations. This chapter reports the results obtained by applying clonal selection programmes within local landraces, with the goal to identify genotypes retaining desirable traits and able to ensure a higher and stable yield. The selected high-yielding genotypes while contributing to increase productivity may also implement the conservation ‘in situ’ of valuable germplasm at risk of extinction. With the goal to move to breeding programme based on crossing strategies, it is pivotal the development of genetic maps with high levels of genome coverage. Genetic maps represent the first step for localizing genes or quantitative trait loci (QTL) that are associated with economically important trait and open the way for marker-assisted selection, comparative mapping between different species, a framework for anchoring physical maps and the basis for map-based cloning of genes. In this chapter, the history of the development of genetic maps in Cynara cardunculus is retraced, starting from the first maps based on a limited number of mostly dominant molecular markers, up to the most recently developed maps allowing the identification of genomic region influencing key agronomic traits.
KeywordsDNA fingerprinting Clonal selection Linkage analysis Genetic maps Quantitative trait loci
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