The present invention relates to methods and compositions for transforming soybean, corn, cotton, or canola explants using spectinomycin as a selective agent for transformation of the explants. The method may further comprise treatment of the explants with cytokinin during the transformation and regeneration process.

The present invention relates to methods and compositions for improving the efficiency of Agrobacterium- and Rhizobium-mediated plant cell transformation by use of additional transformation enhancer sequences, such as overdrive or TSS sequences, operably linked to a T-DNA border sequence on a recombinant construct that comprises T-DNA.

The invention relates to methods for Rhizobia-mediated genetic transformation of plant cells, including soybean, canola, corn, and cotton cells. These include both VirD2-dependent and VirD2-independent methods. Bacterial species utilized include strains of Rhizobium sp., Sinorhizobium sp., and Mesorhizobium sp. Vectors for use in such transformation are also disclosed.

Methods of, and compositions for, assembling one or more transcription units in a genome without a linked selectable marker or other unwanted transcription unit are provided. Also provided methods of, and compositions for, assembling one or more transcription units in a genome with a reduced frequency of vector backbone.

A process of expressing a sequence of interest in a plant, plant part, or plant cell culture, comprising: (a) providing a plant, plant part, or plant cell culture containing in cell nuclei a heterologous DNA having a sequence encoding an RNA replicon operably linked or linkable to a transcription promoter, wherein said sequence encoding an RNA replicon contains (i) sequences for replicon function of said RNA replicon, said sequences being derived from a sequence of a plant RNA virus, (ii) a sequence of interest, whereby said sequences for replicon function exhibit at selected localities of said sequences of said plant RNA virus function-conservative differences from said sequence of said plant RNA virus, said differences causing an increased frequency of replicon formation compared to an RNA replicon not exhibiting said differences; and (b) causing expression of said sequence of interest.

Mesocotyl meristem explants that contain multiple primary meristems are transformed via particle bombardment or Agrobacterium-mediated methods. Regeneration is through an organogenesis pathway that allows for secondary multiple bud formation. This method allows for the genotype independent transformation of varieties of wheat.

The invention provides methods and compositions for identifying transgenic seed that contain a transgene of interest, but lack a marker gene. Use of an identification sequence that results in a detectable phenotype increases the efficiency of screening for seed and plants in which transgene sequences not linked to a gene of interest have segregated from the sequence encoding a gene of interest.

The present invention relates to methods and compositions for improving the efficiency of Agrobacterium- and Rhizobium-mediated plant cell transformation by use of additional transformation enhancer sequences, such as overdrive or TSS sequences, operably linked to a T-DNA border sequence on a recombinant construct that comprises T-DNA.

The invention relates to methods for Rhizobia-mediated genetic transformation of plant cells, including soybean, canola, corn, and cotton cells. These include both VirD2-dependent and VirD2-independent methods. Bacterial species utilized include strains of Rhizobium sp., Sinorhizobium sp., and Mesorhizobium sp. Vectors for use in such transformation are also disclosed.

Methods of, and compositions for, assembling one or more transcription units in a genome without a linked selectable marker or other unwanted transcription unit are provided. Also provided methods of, and compositions for, assembling one or more transcription units in a genome with a reduced frequency of vector backbone.