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Reduction of cholesterol and glycoalkaloid levels in transgenic potato plants by overexpression of a type 1 sterol methyltransferase cDNA
Södertörns högskola, Avdelning Naturvetenskap.
2003 (engelsk)Inngår i: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 131, nr 4, s. 1792-1799Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Transgenic potato (Solanum tuberosum cv Desiree) plants overexpressing a soybean (Glycine max) type 1 sterol methyltransferase (GmSMT1) cDNA were generated and used to study sterol biosynthesis in relation to the production of toxic glycoalkaloids. Transgenic plants displayed an increased total sterol level in both leaves and tubers, mainly due to increased levels of the 24-ethyl sterols isofucosterol and sitosterol. The higher total sterol level was due to increases in both free and esterified sterols. However, the level of free cholesterol, a nonalkylated sterol, was decreased. Associated with this was a decreased glycoalkaloid level in leaves and tubers, down to 41% and 63% of wild-type levels, respectively. The results show that glycoalkaloid biosynthesis can be down-regulated in transgenic potato plants by reducing the content of free nonalkylated sterols, and they support the view of cholesterol as a precursor in glycoalkaloid biosynthesis.

sted, utgiver, år, opplag, sider
2003. Vol. 131, nr 4, s. 1792-1799
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URN: urn:nbn:se:sh:diva-15553DOI: 10.1104/pp.102.018788ISI: 000185076400029PubMedID: 12692338Scopus ID: 2-s2.0-0344942508OAI: oai:DiVA.org:sh-15553DiVA, id: diva2:504716
Tilgjengelig fra: 2012-02-21 Laget: 2012-02-21 Sist oppdatert: 2017-07-19bibliografisk kontrollert

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