Comparative mapping of a gibberellic acid-insensitive dwarfing gene (Dwf2) on chromosome 4HS in barley |
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Authors: | V Ivandic S Malyshev V Korzun A Graner A Börner |
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Institution: | (1) Institut für Pflanzengenetik und Kulturpflanzenforschung (IPK), Corrensstr. 3, D-06466 Gatersleben, Germany Fax: +49-39482 5155 E-mail: boerner@ipk-gatersleben.de, DE;(2) Institute of Genetics and Cytology, F. Skorina St. 27, 220074 Minsk, Belarus, XX |
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Abstract: | We report the genetic mapping of Dwf2, a dominant gibberellic acid (GA3)-insensitive dwarfing gene which has been previously described to cause a very short growth habit in barley (Hordeum vulgare) mutant ‘93/B694’. Using RFLP and microsatellite markers we performed segregation analysis in an F2 population comprising 86 individuals developed from a cross of ‘93/B694’ (Dwf2) with ‘Bonus M2’ (dwf2). Dwf2 was mapped on the short arm of barley chromosome 4H proximal to microsatellite marker XhvOle (5.7 cM) and distal to RFLP marker Xmwg2299 (18.3 cM). The genetic localization of the Dwf2 gene at a homoeologous position to the multiallelic Rht-B1 and Rht-D1 loci in wheat suggests synteny of GA-insensitive dwarfing genes within the Triticeae. Moreover, the extremely prostrate growth habit exhibited in barley ‘93/B694’ (Dwf2) resembles that of wheat plants carrying the genes Rht-B1c (Rht3) or Rht-D1c (Rht10).
Received: 1 July 1998 / Accepted: 17 September 1998 |
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Keywords: | Hordeum vulgare Dwarfing genes GA insensitivity Comparative mapping Microsatellites |
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