title: Increased potato tuber size resulting from apoplastic expression of a yeast invertase.
abstract: The role of sucrose cleavage in determining sink strength in potato was investigated by generating transgenic potato plants that expressed a yeast invertase in either the cytosol or apoplast of tubers. Cytosolic localization gave rise to a reduction in tuber size and an increase in tuber number per plant whereas apoplastic targeting led to an increase in tuber size and a decrease in tuber number per plant. Sink organ size can be manipulated through modification of sucrose metabolism.
authors.affiliation: Institut für Genbiologische Forschung Berlin GmbH, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Sonnewald
authors.forename: M R
authors.initials: MR
authors.lastname: Hajirezaei
authors.forename: J
authors.initials: J
authors.lastname: Kossmann
authors.forename: A
authors.initials: A
authors.lastname: Heyer
authors.forename: R N
authors.initials: RN
authors.lastname: Trethewey
authors.forename: L
authors.initials: L
authors.lastname: Willmitzer
mesh_terms: D002678:Chimera / Q000235:genetics; D003600:Cytosol / Q000201:enzymology; D006026:Glycoside Hydrolases / Q000235:genetics / Q000378:metabolism*; D030821:Plants, Genetically Modified / Q000166:cytology / Q000235:genetics / Q000254:growth & development; D012441:Saccharomyces cerevisiae / Q000201:enzymology*; D011198:Solanum tuberosum / Q000166:cytology / Q000235:genetics / Q000254:growth & development*; D013395:Sucrose / Q000378:metabolism; D043324:beta-Fructofuranosidase
chemical_list: D013395:Sucrose; D006026:Glycoside Hydrolases; D043324:beta-Fructofuranosidase