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Identification, distribution and effects on agronomic traits of the semi-dwarfing Rht alleles in Bulgarian common wheat cultivars

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Abstract

Bulgarian common wheat cultivars released in the period 1925–2003 were studied using the gibberellic acid (GA) test and microsatellite analysis of the Xgwm261 locus on chromosome 2DS to identify the semi-dwarfing (Rht) genes. The old cultivars, isolated through selection from landraces, carried rare alleles (211- and 215-bp) at Xgwm261 locus, and those developed by hybridisation to foreign cultivars, carried the 165- and 174-bp alleles. Forty-two (55.3%) of 76 modern cultivars were GA-responsive. The 192-bp allele, diagnostic for Rht8, was observed in 64 (84.2%) modern cultivars, of which 37 carry Rht8 alone, and 27 possess a combination of Rht8 and a GA-insensitive allele viz. Rht-B1d (17); Rht-D1b (6) and Rht-B1b (4). The 174-bp allele is present in seven cultivars, only one of which is photoperiod-sensitive, and the rest are day-length insensitive. The 203-bp allele was found in six modern cultivars. Cultivars carrying the Rht8 allele are the most widespread and some of them have been cultivated for a long period. Cultivars with the `Saitama 27' allele (Rht-B1d) are the most productive and are second in distribution in the country. The recently observed trend for increasing the proportion of cultivars with GA-insensitive Rht genes is probably due to their combination with the 192-bp allele of Xgwm261 locus tightly linked to the Ppd-D1, to the break of the link between the 174-bp allele and ppd-D1, and to the introduction of other genes influencing flowering time.

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Authors and Affiliations

  1. Institute of Genetics, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria

    Ganka Ganeva & Svetlana Landjeva

  2. Lochow-Petkus GmbH, 37574, Einbeck, Germany

    Viktor Korzun

  3. Dobrudzha Agricultural Institute, 9520, General Toshevo, Bulgaria

    Nikolaj Tsenov & Mariana Atanasova

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  1. Ganka Ganeva
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  2. Viktor Korzun
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  3. Svetlana Landjeva
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  4. Nikolaj Tsenov
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  5. Mariana Atanasova
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Correspondence to Ganka Ganeva.

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Ganeva, G., Korzun, V., Landjeva, S. et al. Identification, distribution and effects on agronomic traits of the semi-dwarfing Rht alleles in Bulgarian common wheat cultivars. Euphytica 145, 305–315 (2005). https://doi.org/10.1007/s10681-005-1742-9

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  • DOI: https://doi.org/10.1007/s10681-005-1742-9

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