Plant in which expression of a clathrin and/or coatomer subunit is suppressed or inhibited， a method for increasing the production of plant biomass and a method for producing a plant

This invention is intended to increase biomass production through suppression of expression of a gene functioning in relation to intracellular vesicular transport or inhibition of functions of a protein encoded by such gene. To this end， expression of a gene encoding the coatomer adapter zeta subunit is suppressed， the coatomer adapter zeta subunit is inhibited， expression of a gene encoding the clathrin adaptor small (sigma) subunit is suppressed， or the clathrin adaptor small (sigma) subunit is inhibited.