Hoechst Schering Agrevo Gmbh

Bayer Intellectual Property Gmbh

Plant Genetic Systems N.v.

Aventis Cropscience Gmbh

Aventis Corporation Gmbh

Hoecsht Schering Agrevo Gmbh

Bayer Cropscience Ag

Klaus Bartsch

Erwin Hacker

Martin Jeffrey Hills

Arno Schulz

Chris Rosinger

Hansjörg Krähmer

Inge Broer

Guido Kriete

Lothar Willms

Hans-Dieter Pohlenz

Alfred P&uuml;hler

Rainer H&ouml;fgen

Klaus Trinks

Rob Dirks

Alfred P{umlaut Over (u)}hler

Nathalie Knittel

J&uuml;rgen Quandt

Roger Peeters

Bert Uijtewaal

Hansjörg Krämer

The invention relates to a method of finding compounds which increase the tolerance of plants to abiotic stress factors acting on this plant, such as, for example, temperature (such as chill, frost or heat), water (such as dryness, drought or anoxia), or the chemical load (such as lack of or excess of mineral salts, heavy metals, gaseous noxious substances) by increasing the expression of plant-endogenous proteins, and to the use of these compounds for increasing the tolerance in plants to abiotic stress factors.

Active substances for increasing the stress defense in plants to abiotic stress, and methods of finding them

The patent application describes a process for the enzymatic chiral synthesis of L-phosphinothricin by transamination from its corresponding keto acid PPO with aspartate as amino donor. It is possible by a suitable reaction procedure to achieve a quantitative conversion on use of approximately equimolar amounts of amino donor and acceptor with complete consumption of the donor amino acid aspartate. The use of thermally stable transaminases makes a higher reaction rate and correspondingly large space/time yields possible.

Process for the preparation of L-phosphinothricine by enzymatic transamination with aspartate

The invention relates to processes for producing transgenic female-sterile plants using pistil or stigma tissue-specific promoters. In these plants, the development of particular plant parts can be prevented deliberately.

Process for producing female-sterile plants

The invention relates to processes for producing transgenic plants using tissue-specific promoters. In these plants, the development of particular plant parts can be prevented deliberately.

Process for producing female sterile plants

Method for the production of L-amino acids from their racemic N-aceytyl-D, L-derivatives by enzymatic racemate cleavage by means of isolated recombinant enzymes

The invention relates to DNA molecules which code for deacetylases or proteins having the biological activity of a deacetylase and also transgenic plant cells which were transformed using the DNA molecules according to the invention. These molecules can be used for the production of plants having specifically destroyable parts, i.e. male- or female-sterile plants, by means of the specific expression of a deacetylase gene.

Genes coding for amino acid deacetylases with specificity for N-acetyl-L-phosphinothricin, their isolation and use

The invention relates to the use of a deacetylase coding sequence for obtaining conditional sterility in wheat. The invention relates to vectors comprising a deacetylase coding sequence under control of promoters which direct stamen-selective expression in wheat, which are particularly suited for the production of wheat plants which can be made male-sterile upon application of an acetylated toxin.

Conditional sterility in wheat

The invention is directed to a process for the generation of male sterility in plants comprising the steps of (a) transforming a plant cell with DNA sequences that selectively inhibit the expression of essential metabolic compounds and (b) regenerating plants from said plant cells. Cells impaired in the biosynthesis of basic metabolic compounds undergo starvation and eventually die. Such pathways include amino acid biosynthesis, nucleic acid biosynthesis and other biosynthetic pathways such as citric acid cycle, pentose phosphate pathway, fatty acid metabolism, vitamin biosynthesis that will render the cell inactive due to nutrient depletion, if one or more enzymes or proteins involved in this pathway would become inactive by using inhibitory DNA constructs.

Process for generating male sterile plants

Genes coding for amino acid deacetylases with specificity for N-acetyl-L-phosphinothricin, their isolation and their use

Process for the enzymatic separation of phosphinothricin derivatives, which comprises treating a mixture of D- and L-phosphinothricin derivatives of the formulae (I) and (II) ##STR1## with a hydrolytically active enzyme in an aqueous or aqueous-organic medium.

Process for the enzymatic cleavage of

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Königstein, Germany

Klaus Bartsch