Abstract
Key messageThe comparison of QTL detection performed on an elite panel and an (elite times exotic) progeny shows that introducing exotic germplasm into breeding programs can bring new interesting allelic diversity.Selection of stable varieties producing the highest amount of extractable sugar per hectare (ha), resistant to diseases, and respecting environmental criteria is undoubtedly the main target for sugar beet breeding. As sodium, potassium, and alpha-amino nitrogen in sugar beets are the impurities that have the biggest negative impact on white sugar extraction, it is interesting to reduce their concentration in further varieties. However, domestication history and strong selection pressures have affected the genetic diversity needed to achieve this goal. In this study, quantitative trait locus (QTL) detection was performed on two populations, an (elite times exotic) sugar beet progeny and an elite panel, to find potentially new interesting regions brought by the exotic accession. The three traits linked with impurities content were studied. Some QTLs were detected in both populations, the majority in the elite panel because of most statistical power. Some of the QTLs were colocated and had favorable effect in the progeny since the exotic allele was linked with a decrease in the impurity content. A few number of favorable QTLs were detected in the progeny, only. Consequently, introgressing exotic genetic material into sugar beet breeding programs can allow the incorporation of new interesting alleles.
Highlights
The sugar beet (Beta vulgaris L. ssp. vulgaris) is an important European crop for sugar production; it is used as a source for bioethanol and animal feed
The comparison of Quantitative trait locus (QTL) found in both populations and their positive or negative effects on impurities will allow us to determine whether the progeny has interesting alleles not present in the elite panel
It penalizes the Bayesian Information Criterion (BIC) calculation according to the number of possible models for a given number of regressors using a mathematical combination
Summary
The sugar beet (Beta vulgaris L. ssp. vulgaris) is an important European crop for sugar production; it is used as a source for bioethanol and animal feed. AKER proposes to increase the genetic variability of sugar beets by searching for interesting new alleles from exotic resources around the world. The introgression of these new alleles in elite material will produce new varieties with a high potential for use by the industry. The complementary genetic diversity of elite lines was maximized and the number went from 2000 to 16 exotic accessions These 16 exotic plants have been selected worldwide as representing the maximum of the genetic variability not present in cultivated lines. One of these accessions was crossed several times with an elite to create a population called (elite × exotic) progeny. In (Schnaithmann and Pillen 2013), favorable exotic QTLs were found in a barley introgression line
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