Gene capable of increasing the production of plant biomass and method for using the same

A plant production method, which comprises the steps of:

• preparing a transformed plant into which a gene encoding a protein comprising a common sequence consisting of the amino acid sequence shown in SEQ ID NO:
• 3 and a common sequence consisting of the amino acid sequence shown in SEQ ID NO:
• 2 in such order from the N-terminal side and having a coiled-coil structure, a nucleic acid binding site, and a leucine rich repeat structure has been introduced or in which an expression control region of the gene that is endogenously presented has been altered;
• and determining the amount of biomass and salt stress resistance of a progeny plant of the transformed plant and selecting a line that exhibits a significantly improved amount of biomass and salt stress resistance.