Novel candidate genes AuxRP and Hsp90 influence the chip color of potato tubers

• Published in: Molecular breeding Vol. 35; no. 12; pp. 224 - 12
• Main Authors: Sołtys-Kalina, Dorota, Szajko, Katarzyna, Sierocka, Izabela, Śliwka, Jadwiga, Strzelczyk-Żyta, Danuta, Wasilewicz-Flis, Iwona, Jakuczun, Henryka, Szweykowska-Kulinska, Zofia, Marczewski, Waldemar
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.12.2015; Springer Nature B.V
• Subjects: Biomedical and Life Sciences; Biotechnology; Bulk sampling; Chromosome 6; Chromosomes; Cloning; Cold storage; Color; diploidy; Gene expression; gene expression regulation; Gene mapping; Gene sequencing; Genes; Genetic diversity; genetic variation; Heat shock proteins; heat-shock protein 90; Hsp90 protein; Life Sciences; Mapping; messenger RNA; Molecular biology; nucleotide sequences; phenotype; Phenotypes; phenotypic variation; Phenotypic variations; Plant biology; Plant Genetics and Genomics; Plant Pathology; Plant Physiology; Plant Sciences; Polymerase chain reaction; Potatoes; Progeny; protein synthesis; Proteins; quantitative polymerase chain reaction; Quantitative trait loci; Reconditioning; reducing sugars; reverse transcriptase polymerase chain reaction; Ribonucleic acid; RNA; Solanum tuberosum; storage time; Sugar; sugar content; Transcription; Tubers; Vegetables; Western blotting; Quantitative trait loci; (; gene; -; DArT markers; Reducing sugar content; Auxin-regulated protein (AuxRP) gene; Solanum tuberosum; Heat-shock protein 90 (Hsp90) gene
• ISSN: 1380-3743; 1572-9788
• DOI: 10.1007/s11032-015-0415-1

Potato (Solanum tuberosum L.) tubers exhibit significant variation in reducing sugar content directly after harvest, cold storage and reconditioning. Here, we performed QTL analysis for chip color, which is strongly influenced by reducing sugar content, in a diploid potato mapping population. Two QTL on chromosomes I and VI were detected for chip color after harvest and reconditioning. Only one region on chromosome VI was linked with cold-induced sweetening. Using the RT-PCR technique, we showed differential expression of the auxin-regulated protein (AuxRP) gene. The AuxRP transcript was presented in light chip color parental clone DG 97-952 and the RNA progeny of the bulk sample consisting of light chip color phenotypes after cold storage. This amplicon was absent in dark chip parental clone DG 08-26/39 and the RNA bulk sample of dark chip progeny. Genetic variation of AuxRP explained up to 16.6 and 15.2 % of the phenotypic variance after harvest and 3 months of storage at 4 °C, respectively. Using an alternative approach, the RDA-cDNA method was used to recognize 25 gene sequences, of which 11 could be assigned to potato chromosome VI. One of these genes, Heat-shock protein 90 (Hsp90), demonstrated higher mRNA and protein expression in RT-qPCR and western blotting assays in the dark chip color progeny bulk sample compared with the light chip color progeny bulk sample. Our study, for the first time, suggests that the AuxRP and Hsp90 genes are novel candidate genes capable of influencing the chip color of potato tubers.