Patent Lens > Technology Landscapes > Agrobacterium-mediated transformation of plants

Sugar beet


sugarbeet_inspectionThe invention claimed by Biosem in a granted European patent is directed to the transformation of callus of sugar beet by contacting the calli with Agrobacterium having a vector with a gene of interest. The transformation process takes place in a liquid culture medium.

A transgenic sugar beet plant resistant to the sugar beet necrotic yellow vein virus is also part of the disclosed invention. A cDNA or genomic fragment conferring resistance to this virus is specifically limited to a certain nucleotide sequence that encodes at least part of the protein responsible for the resistance.

Monsanto has recently filed applications in Australia, United States and a PCT application related to a method for transforming a sugar beet leaf with Agrobacterium. The transformed leaf is initially derived from a selected region of a sugar beet seedling.

The following table presents basic bibliographic data and a summary of the inventions. Full text of the granted European patent and the PCT application can be accessed as PDF.

Sugar beet
Assigned to Biosem
Issued patents
Patent No. Issue date Summary of the claims

EP 517833 B1

Full patent text

November 2, 1995

Method for transforming calli of sugar beet by contacting a suspension of them with Agrobacterium having a vector with a gene to be introduced into the plant cells. The gene of interest confers resistance to the infection caused by the sugar beet necrotic yellow vein virus.

View Claims

Remarks: Granted French patent FR 2658987 B1 is not analyzed.

Assigned to Monsanto

Application No. Publication date Summary of the claims

WO 01/42480 A2*

Full patent application text
(1,181 kb)

June 14, 2001

A method for preparing transgenic sugar beet cells by selecting part of the cotyledon and hypocotyl region of a sugar beet seedling and micropropagating this part to form a shoot, from which a leaf is selected and put in contact with Agrobacterium cells. The Agrobacterium cells contain a vector with an exogenous gene. Transgenic sugar beet plants capable of expressing the exogenous gene are also recited in the claims. View Claims

US 2001/42257 A1*

Full patent application text
(880 kb)

November 15, 2001

The filed claims are worded the same as the claims of the related PCT patent application. View Claims

Remarks: A related application was also filed in Australia (AU 200125757 A5).

*It is important to remember that applications are not issued patents and the claims as filed have not been approved by any country. Thus, they are non-binding.

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