Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 357849
Title StGA2ox1 is induced prior to stolon swelling and controls GA levels during potato tuber development
Author(s) Kloosterman, B.A.; Navarro, C.; Bijsterbosch, G.; Lange, Theo; Prat, S.; Visser, R.G.F.; Bachem, C.W.B.
Source The Plant Journal 52 (2007)2. - ISSN 0960-7412 - p. 362 - 373.
Department(s) Laboratory of Plant Breeding
PRI Biodiversity and Breeding
Publication type Refereed Article in a scientific journal
Publication year 2007
Keyword(s) differential gene-expression - gibberellin metabolism - phytochrome-b - solanum-tuberosum - transcript levels - 20-oxidase gene - in-vitro - tuberization - biosynthesis - antirrhinum
Abstract The formation and growth of a potato (Solanum tuberosum) tuber is a complex process regulated by different environmental signals and plant hormones. In particular, the action of gibberellins (GAs) has been implicated in different aspects of potato tuber formation. Here we report on the isolation and functional analysis of a potato GA 2-oxidase gene (StGA2ox1) and its role in tuber formation. StGA2ox1 is upregulated during the early stages of potato tuber development prior to visible swelling and is predominantly expressed in the subapical region of the stolon and growing tuber. 35S-over-expression transformants exhibit a dwarf phenotype, reduced stolon growth and earlier in vitro tuberization. Transgenic plants with reduced expression levels of StGA2ox1 showed normal plant growth, an altered stolon swelling phenotype and delayed in vitro tuberization. Tubers of the StGA2ox1 suppression clones contain increased levels of GA20, indicating altered GA metabolism. We propose a role for StGA2ox1 in early tuber initiation by modifying GA levels in the subapical stolon region at the onset of tuberization, thereby facilitating normal tuber development and growth.
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