This invention relates to methods for increasing carbon fixation, increasing biomass production and/or increasing abiotic stress tolerance in a plant comprising: introducing into a plant, plant part, and/or plant cell a heterologous polynucleotide encoding a ferredoxin polypeptide and/or a heterologous polynucleotide encoding a biotin ligase polypeptide to produce a stably transformed plant, plant part, and/or plant cell, wherein said heterologous polynucleotides are from a bacterial and/or an archaeal species. Further provided are plants, plant parts and plant cells produced by the methods of the invention.
