The invention relates to a method for the production of plants with suppressed photorespiration and improved CO.sub.2 fixation. In particular, the invention relates to a re-use of phosphoglycolate produced in photorespiration. The reaction product is converted to a component that may be reintegrated into the plant assimilatory metabolism inside the chloroplast. This is accomplished by the transfer of genes derived from glycolate-utilizing pathways from bacteria, algae, plants and/or animals including humans into the plant nuclear and/or plastidial genome. The methods of the invention lead to reduced photorespiration in C.sub.3 plants and, therefore, are of great benefit for food production, especially but not exclusively under non-favourable growth conditions.


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