Abstract: The present invention provides an early-maturing transgenic plant, which comprises a nucleic acid that encodes a protein having activity of causing early maturation of a plant, so that the gene can be expressed.

Abstract: This invention is intended to identify a gene that regulates endoreduplication in a plant and to use such gene for breeding aimed at increasing the crop size. This invention provides a gene encoding an Arabidopsis thaliana-derived protein having an amino acid sequence as shown in SEQ ID NO: 2, 4, 6, 8, 10, or 12, which has endoreduplication promoting activity, a transgenic plant into which such gene has been introduced, thereby increasing the nuclear DNA content in the cells of such plant, and a method of using such gene to increase the size of the entire plant or a part thereof.

Abstract: This invention is intended to identify a gene that regulates endoreduplication in a plant and to use such gene for breeding aimed at increasing the crop size. This invention provides a gene encoding an Arabidopsis thaliana-derived protein having an amino acid sequence as shown in SEQ ID NO: 2, 4, 6, 8, 10, or 12, which has endoreduplication promoting activity, a transgenic plant into which such gene has been introduced, thereby increasing the nuclear DNA content in the cells of such plant, and a method of using such gene to increase the size of the entire plant or a part thereof.

Abstract: The present invention provides an early-maturing transgenic plant, which comprises a nucleic acid that encodes a protein having activity of causing early maturation of a plant, so that the gene can be expressed.

Abstract: A gene causative of a phenotype is easily specified and thus gene functions are comprehensively analyzed. A method for analyzing a gene function includes (a) infecting a plant group with a full-length cDNA library containing an expression regulatory sequence to introduce the cDNA into the plants; (b) selecting a plant complying with desired selection requirements from the plants into which the cDNA has been introduced; (c) isolating the cDNA from the selected plant; and (d) re-introducing the thus isolated cDNA into a plant of the same species as the plant into which the cDNA has been introduced, to reconfirm a phenotype according to the selection requirements.

Abstract: An object of the present invention is to explore, isolate, and identify a dwarfing gene by activation tagging. The present invention provides a gene encoding a protein of the following (a) or (b): (a) a protein consisting of the amino acid sequence represented by any of SEQ ID NOs: 2, 4, 6, and 8; or (b) a protein consisting of an amino acid sequence derived from the amino acid sequence represented by any of SEQ ID NOs: 2, 4, 6, and 8 with the deletion, substitution, or addition of one or several amino acids and having the activity of dwarfing a plant body.

Abstract: A gene causative of a phenotype is easily specified and thus gene functions are comprehensively analyzed. A method for analyzing a gene function comprises: (a) infecting a plant group with a full-length cDNA library containing an expression regulatory sequence to introduce the cDNA into the plants; (b) selecting a plant complying with desired selection requirements from the plants having the cDNA introduced thereinto; (c) isolating the cDNA from the selected plant; and (d) re-introducing the thus isolated cDNA into a plant of the same species as the plant into which the cDNA has been introduced, to reconfirm a phenotype according to the selection requirements.