Tolerance to Salt Stress of the Transgenic Tetrasomic Tetraploid Potato, Solanum tuberosum cv. Desiree Appears to be Induced by the DREB1A Gene and rd29A Promoter of Arabidopsis thaliana

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  • Celebi-Toprak Fevziye
    Gene Research Center and Graduate School of Life and Environmental Sciences, University of Tsukuba Present address: Department of Biology, Division of Molecular Biology, Pamukkale University
  • Behnam Babak
    Gene Research Center and Graduate School of Life and Environmental Sciences, University of Tsukuba
  • Serrano Gustavo
    Graduate School for Biosystem Studies, University of Tsukuba
  • Kasuga Mie
    Biological Resources Division, Japan International Research Center for Agricultural Sciences
  • Yamaguchi-Shinozaki Kazuko
    Biological Resources Division, Japan International Research Center for Agricultural Sciences
  • Naka Hiroshi
    Present address: Department of Biotechnological Science, Kinki University
  • Watanabe Junko A.
    Gene Research Center and Graduate School of Life and Environmental Sciences, University of Tsukuba Present address: Department of Biotechnological Science, Kinki University
  • Yamanaka Shinsuke
    Gene Research Center and Graduate School of Life and Environmental Sciences, University of Tsukuba Present address: Genebank, National Institute of Agrobiological Resources
  • Watanabe Kazuo N.
    Gene Research Center and Graduate School of Life and Environmental Sciences, University of Tsukuba Present address: Department of Biotechnological Science, Kinki University

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Tetraploid potato cv. Desiree was transformed using an Arabidopsis thaliana stress-inducible promoter rd29A and the DREB1A gene, which confers multiple tolerances to abiotic stresses (e.g., dehydration and elevated soil salinity). Transformed Desiree lines showed a direct correlation between the DREB1A expression levels and the tolerance to salinity. By producing a filial progeny from the transgenic lines which was considered to harbor a single copy of the DREB1A gene, crossed with a non-transgenic cultivar, the genotype at the transgenic locus of these tetrasomic tetraploids was estimated by chi-square test, suggesting the existence of a Simplex mode. The results showed that low-copy heterozygous loci with the DREB1A gene could sustain the expression, and consequently confer a significant tolerance to salinity in tetrasomic tetraploid potatoes.<br>

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