title: Glycoalkaloid and calystegine levels in table potato cultivars subjected to wounding, light, and heat treatments.
abstract: Potato tubers naturally contain a number of defense substances, some of which are of major concern for food safety. Among these substances are the glycoalkaloids and calystegines. We have here analyzed levels of glycoalkaloids (α-chaconine and α-solanine) and calystegines (A₃, B₂, and B₄) in potato tubers subjected to mechanical wounding, light exposure, or elevated temperature: stress treatments that are known or anticipated to induce glycoalkaloid levels. Basal glycoalkaloid levels in tubers varied between potato cultivars. Wounding and light exposure, but not heat, increased tuber glycoalkaloid levels, and the relative response differed among the cultivars. Also, calystegine levels varied between cultivars, with calystegine B4 showing the most marked variation. However, the total calystegine level was not affected by wounding or light exposure. The results demonstrate a strong variation among potato cultivars with regard to postharvest glycoalkaloid increases, and they suggest that the biosynthesis of glycoalkaloids and calystegines occurs independently of each other.
authors.affiliation: Department of Plant Biology and Forest Genetics, Uppsala BioCenter, Swedish University of Agricultural Sciences , and Linnean Centre for Plant Biology, P.O. Box 7080, 750 07 Uppsala, Sweden.
authors.forename: Erik V
authors.initials: EV
authors.lastname: Petersson
authors.forename: Usman
authors.initials: U
authors.lastname: Arif
authors.forename: Vera
authors.initials: V
authors.lastname: Schulzova
authors.forename: Veronika
authors.initials: V
authors.lastname: Krtková
authors.forename: Jana
authors.initials: J
authors.lastname: Hajšlová
authors.forename: Johan
authors.initials: J
authors.lastname: Meijer
authors.forename: Hans Christer
authors.initials: HC
authors.lastname: Andersson
authors.forename: Lisbeth
authors.initials: L
authors.lastname: Jonsson
authors.forename: Folke
authors.initials: F
authors.lastname: Sitbon
mesh_terms: D018556:Crops, Agricultural / Q000737:chemistry* / Q000378:metabolism / Q000528:radiation effects; D005511:Food Handling; D063427:Food Quality; D006031:Glycosylation; D006358:Hot Temperature / Q000009:adverse effects; D008027:Light / Q000009:adverse effects; D055595:Mechanical Phenomena; D009662:Nortropanes / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D035281:Plant Tubers / Q000737:chemistry* / Q000378:metabolism / Q000528:radiation effects; D012991:Solanaceous Alkaloids / Q000032:analysis* / Q000096:biosynthesis / Q000737:chemistry / Q000378:metabolism; D012992:Solanine / Q000031:analogs & derivatives / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D011198:Solanum tuberosum / Q000737:chemistry* / Q000378:metabolism / Q000528:radiation effects; D013045:Species Specificity; D013237:Stereoisomerism; D013548:Sweden; D015854:Up-Regulation
chemical_list: D009662:Nortropanes; D012991:Solanaceous Alkaloids; C514919:alpha-solanine; C110568:calystegine A3; C095613:calystegine B(2); D012992:Solanine; C011860:alpha-chaconine