The present invention relates to a recombinant microorganism producing quinolinic acid, more particularly, a microorganism producing quinolinic acid and having attenuated activity or eliminated activity of a protein having a sequence of SEQ ID NO: 1 and a method of producing quinolinic acid by using the recombinant microorganism.

The present invention relates to a quinolinic acid-producing recombinant microorganism expressing a fusion protein of L-aspartate oxidase and quinolinate synthase linked via a linker, and a method for producing quinolinic acid using the same.

The invention relates to a method for increasing the yield and biomass of a plant, by means of an increase in the expression of the L-aspartate oxidase in the plant. The method according to the invention allows an increase in the photosynthetic capacities of the plants as a result of an increase in the quantities of NAO and the derivatives thereof in said plants. The invention relates to the plants produced by such a method.