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Originally published as Genetics Published Articles Ahead of Print on March 31, 2005.
Genetics, Vol. 170, 813-821, June 2005, Copyright © 2005
doi:10.1534/genetics.104.040006
DNA Variation at the Invertase Locus invGE/GF Is Associated With Tuber Quality Traits in Populations of Potato Breeding Clones
Li Li*,
Josef Strahwald
,
Hans-Reinhard Hofferbert
,
Jens Lübeck,
Eckart Tacke
,
Holger Junghans**,
Jörg Wunder and
Christiane Gebhardt*,1
* Max-Planck Institut für Züchtungsforschung, 50829 Köln, Germany
SaKa-Ragis Pflanzenzucht GbR, 24340 Windeby, Germany
Böhm-Nordkartoffel Agrarproduktion GbR, 21337 Lüneburg, Germany
Bioplant GmbH, 29574 Ebstorf, Germany
** NORIKA GmbH, 18190 Gross Lüsewitz, Germany
Istituto Agrario di San Michele all'Adige, 38010 San Michele all'Adige, Italy
1 Corresponding author: Max-Planck Institute for Plant Breeding Research, Carl von Linné Weg 10, 50829 Köln, Germany.
E-mail: gebhardt{at}mpiz-koeln.mpg.de
Starch and sugar content of potato tubers are quantitative traits, which are models for the candidate gene approach for identifying the molecular basis of quantitative trait loci (QTL) in noninbred plants. Starch and sugar content are also important for the quality of processed products such as potato chips and French fries. A high content of the reducing sugars glucose and fructose results in inferior chip quality. Tuber starch content affects nutritional quality. Functional and genetic models suggest that genes encoding invertases control, among other things, tuber sugar content. The invGE/GF locus on potato chromosome IX consists of duplicated invertase genes invGE and invGF and colocalizes with cold-sweetening QTL Sug9. DNA variation at invGE/GF was analyzed in 188 tetraploid potato cultivars, which have been assessed for chip quality and tuber starch content. Two closely correlated invertase alleles, invGE-f and invGF-d, were associated with better chip quality in three breeding populations. Allele invGF-b was associated with lower tuber starch content. The potato invertase gene invGE is orthologous to the tomato invertase gene Lin5, which is causal for the fruit-sugar-yield QTL Brix9-2-5, suggesting that natural variation of sugar yield in tomato fruits and sugar content of potato tubers is controlled by functional variants of orthologous invertase genes.
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