PROBLEM TO BE SOLVED: To provide a method of supplying high-purity T3 in large quantities, plants or cells or calluses to be used for the same, and a method for producing the plants or calluses, and the like.SOLUTION: The invention includes a method for producing a plant cell or plant which generates T3 without substantially containing Toc by allowing geranylgeranyl reductase gene of the plant concerned not to function substantially, in a plant which generates T3 and Toc by nature.