Method of producing lipid

A method of improving productivity of fatty acids or lipids containing the same as components in a Nannochloropsis cell, the method comprising:

• culturing, in culture medium, a Nannochloropsis cell that has been transformed with, and expresses, a gene encoding transketolase and a gene encoding fructose-1,6-bisphosphate aldolase;
• and
• isolating fatty acids or lipids containing the same as components from the cultured product;
• wherein the productivity of the fatty acids or lipids containing the same as components that are isolated from the cultured product is improved as compared to that of a Nannochloropsis host cell that has not been transformed with either gene;
• and,
• wherein the amino acid sequence of the transketolase is that of the following protein (A) or (B), and the amino acid sequence of the fructose-1,6-bisphosphate aldolase is that of the following protein (C) or (D):
• (A) a protein consisting of the amino acid sequence set forth in SEQ ID NO:
• 1;
• (B) a protein consisting of an amino acid sequence having 90% or more identity with the amino acid sequence of protein (A), and having transketolase activity;
• (C) a protein consisting of the amino acid sequence set forth in SEQ ID NO:
• 3;
• and
• (D) a protein consisting of an amino acid sequence having 90% or more identity with the amino acid sequence of protein (C), and having fructose-1,6-bisphosphate aldolase activity.