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Plant Cell Reports

, Volume 20, Issue 8, pp 706–711 | Cite as

L-Cysteine increases Agrobacterium-mediated T-DNA delivery into soybean cotyledonary-node cells

  •  P. Olhoft
  •  D. Somers
Genetic Transformation and Hybridization

Abstract.

A major limitation in producing transgenic soybeans [Glycine max (L.) Merrill] using the Agrobacterium-mediated cotyledonary-node method is low-frequency T-DNA transfer from Agrobacterium tumefaciens into cotyledonary-node cells. We increased Agrobacterium infection from 37% to 91% of explants in the cotyledonary-node region by amending the solid co-cultivation medium with L-cysteine, which resulted in a fivefold increase in stable T-DNA transfer in newly developed shoot primordia. Southern analysis detected greater than a twofold increase in transformation efficiency, as determined by the number of independent fertile, transgene plants per explants inoculated. Enzymatic browning on explant tissue was also reduced, which suggests cysteine may interact with wound- and pathogen-defense responses in the soybean explant, resulting in an increased T-DNA delivery into the cotyledonary-node cells.

Agrobacterium tumefaciens Glycine max Transformation Enzymatic browning Wound- and pathogen-defense response 

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  •  P. Olhoft
    • 1
  •  D. Somers
    • 1
  1. 1.Department of Agronomy and Plant Genetics, University of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108, USA

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