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Transgenic Trifolium repens with foliage accumulating the high sulphur protein, sunflower seed albumin

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Abstract

With the aim of increasing the rumen-protected level of the sulphur amino acids cysteine and methionine in Trifolium repens, we introduced the coding sequence of the sunflower seed albumin (SSA) into T. repens by Agrobacterium tumefaciens-mediated transformation. The SSA gene was modified such that the protein would be localised to the endoplasmic reticulum (ER). Four different T-DNA constructions all containing the SSA gene driven by either the promoter of a gene encoding the small subunit of ribulose bisphosphate carboxylase (Rubisco) from Arabidopsis thaliana (A ssu), the promoter of the gene encoding the small subunit of Rubisco of Medicago sativa (L ssu), or the Cauliflower Mosaic Virus 35S promoter (CaMV35S), were transferred to T. repens cv. Haifa. Transgenic T 0-plants and inter-transgenic hybrids were analysed for the level of SSA accumulation in the leaves by western blotting. The highest observed level of SSA accumulation was 0.1% of total extractable leaf protein. We observed that the promoter had a substantive effect on the level of SSA accumulation with A ssu>CaMV35S>L ssu. Results from the inter-transgenic hybrids showed that the capacity to synthesise SSA was inherited. However the level of SSA accumulation in the leaves generally appears not to be additive with extra transgenic loci. During this work, we attempted to improve the efficiency of A. tumefaciens-mediated transformation of T. repens using the SAAT-method (Sonication Assisted Agrobacterium-mediated Transformation) on cotyledons of T. repens. T-DNA transfer was in general not enhanced by sonication compared to traditional A. tumefaciens-mediated transformation. Furthermore, Southern blot analyses of plants regenerated from the same cotyledon after A. tumefaciens treatment and under selection, indicated that multiple shoots were usually derived from the same transformation event. We concluded from these results that only one plant from each A. tumefaciens-treated cotyledon should be taken to avoid transgenic clones.

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Authors and Affiliations

  1. DLF-Trifolium, Danish Plant Breeding, Højerupvej 31, DK-4660, Store Heddinge, Denmark

    P. Christiansen & C. Pedersen

  2. CSIRO Division of Plant Industry, GPO Box 1600, Canberra, Australia

    J.M. Gibson, A. Moore, L. Tabe & P.J. Larkin

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  1. P. Christiansen
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  2. J.M. Gibson
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  3. A. Moore
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  4. C. Pedersen
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  5. L. Tabe
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  6. P.J. Larkin
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Christiansen, P., Gibson, J., Moore, A. et al. Transgenic Trifolium repens with foliage accumulating the high sulphur protein, sunflower seed albumin. Transgenic Res 9, 103–113 (2000). https://doi.org/10.1023/A:1008967409302

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