Abstract: This invention relates to fertilizer and herbicide compositions. The present invention provides a composition for selective fertilization of a transgenic plant comprising a polypeptide which metabolizes a D-amino acid substrate; said composition comprising said D-amino acid substrate. Another aspect of the present invention provides a selective herbicide composition comprising a D-amino acid. Such a herbicide will inhibit or reduce the growth of plants which do not contain the appropriate D-amino acid metabolizing enzyme, while the growth of transgenic plants which are able to metabolize the D-amino acid will be unaffected or, more preferably, be increased or enhanced. Methods and means are also provided for selectively modulating the growth and stress tolerance such plants using D-amino acids.

Abstract: The invention relates to improved construct and methods for eliminating maker sequences from the genome of plants, based on dual-function selection marker which—depending on the employed compound—can act as both negative and counter-selection marker.

Abstract: The invention relates to a method for preventing and/or suppressing growth of transgenic plants comprising a transgenic expression cassette for a D-amino acid oxidase, which are grown on a field, in subsequent seasons among a population of other plants on said field or neighboring fields based on selective killing of the transgenic plants by application of a D-amino acid (e.g. D-isoleucine) which is metabolized by said D-amino acid in said transgenic plants into a phytotoxic compound.

Abstract: This invention relates to plants and plant cells which express heterologous D-amino acid metabolizing enzymes and may therefore employ D-amino acids as a source of nitrogen. Methods and means are provided for selectively modulating the growth and stress tolerance such plants using D-amino acids. The methods can be used either for detoxification of phytotoxic D-amino acids such as D-alanine and D-serine, thereby allowing for selection of plants comprising said D-amino acid metabolizing enzymes, or for enhancing toxicity of lesser phytotoxic D-amino acids such as D-isoleucine, thereby allowing for selection of plants not comprising said D-amino acid metabolizing enzymes.

Abstract: This invention relates to plants and plant cells which express heterologous D-amino acid metabolizing enzymes and may therefore employ D-amino acids as a source of nitrogen. Methods and means are provided for selectively modulating the growth and stress tolerance of such plants using D-amino acids. The methods can be used either for detoxification of phytotoxic D-amino acids such as D-alanine and D-serine, thereby allowing for selection of plants comprising said D-amino acid metabolizing enzymes, or for enhancing toxicity of lesser phytotoxic D-amino acids such as D-isoleucine, thereby allowing for selection of plants not comprising said D-amino acid metabolizing enzymes.

Abstract: This invention relates to plants and plant cells which express heterologous D-amino acid metabolising enzymes and may therefore employ D-amino acids as a source of nitrogen Methods and means are provided for selectively modulating the growth and stress tolerance such plants using D-amino acids.