Abstract: The invention relates to tonoplast proton/sugar antiporter proteins, more particularly tonoplast proton/saccharose antiporter proteins, the nucleotide sequences which encode them and uses thereof for producing transgenic plants with an increased saccharose concentration. The invention also includes methods for producing transgenic plants with an increased saccharose concentration, methods for increasing the saccharose concentration in plants, and for identifying plants which are suitable for creating a higher saccharose concentration.

Abstract: The invention relates to tonoplast proton/sugar antiporter proteins, more particularly tonoplast proton/saccharose antiporter proteins, the nucleotide sequences which encode them and uses thereof for producing transgenic plants with an increased saccharose concentration. The invention also includes methods for producing transgenic plants with an increased saccharose concentration, methods for increasing the saccharose concentration in plants, and for identifying plants which are suitable for creating a higher saccharose concentration.

Abstract: The invention relates to tonoplast proton/sugar antiporter proteins, more particularly tonoplast proton/saccharose antiporter proteins, the nucleotide sequences which encode them and uses thereof for producing transgenic plants with an increased saccharose concentration. The invention also includes methods for producing transgenic plants with an increased saccharose concentration, methods for increasing the saccharose concentration in plants, and for identifying plants which are suitable for creating a higher saccharose concentration.

Abstract: The present invention is concerned with the improvement of aghcobiological traits in plants. More specifically, it relates to a plant cell comprising in its chloroplasts enzymatic activities for converting glycolate into malate. Preferably, said plant cell comprises a first polypeptide having glycolat oxidase activity, a second polypeptide having malate synthase activity and a third polypeptide having catalase activity or a first polypeptide having glycolat dehydrogenase activity and a second polypeptide having malate synthase activity. Also encompassed is a plant comprising said plant cells as well as seeds obtainable from the said plants. The present invention, furthermore, relates to a method for producing a transgenic plant or a plant cell having an increased water use efficiency or increased yield. The present invention contemplates polynucleotides comprising a combination of nucleic acids encoding the aforementioned polypeptides as well as vectors comprising the polynucleotides and uses thereof.

Abstract: DNA molecules are described which code for a plastid 2-oxoglutarate/malate translocator, particularly from Spinacia oleracea, as well as bacteria, fungi, transgenic plant cells and transgenic plants containing such DNA molecules.