Plant having biological activity of a haploid inducer and comprising a polynucleotide which comprises a nucleotide sequence encoding a centromer histone H3 (CENH3) protein, wherein the polynucleotide comprises a mutation causing an alteration of the amino acid sequence of the CENH3 protein in the N-terminal domain and wherein said alteration confers the biological activity of a haploid inducer, wherein the alteration is a substitution of 1 to 7 amino acids, wherein the polynucleotide comprising the mutation is an endogenous gene, and wherein the mutation causes a substitution of i. the amino acid arginine at position 2 of SEQ ID NO: 23 is substituted, preferably for lysine, or ii. the amino acid serine at position 9 of SEQ ID NO: 14 is substituted, preferably for phenylalanine, or iii. the amino acid arginine at position 16 of SEQ ID NO: 14 is substituted, preferably for glutamine, or iv. the amino acid serine at position 24 of SEQ ID NO: 14 is substituted, preferably for leucine, or v. the amino acid alanine at position 25 of SEQ ID NO: 17 is substituted, preferably for threonine, or vi. the amino acid glutamic acid at position 29 of SEQ ID NO: 14 is substituted, preferably for lysine, or vii. the amino acid glycine at position 30 of SEQ ID NO: 14 is substituted, preferably for aspartic acid, or viii. the amino acid alanine at position 33 of SEQ ID NO: 14 or at position 32 of SEQ ID NO: 20 is substituted, preferably for threonine, or ix. the amino acid proline at position 35 of SEQ ID NO: 14 is substituted, preferably for leucine, or x. the amino acid glutamic acid at position 35 of SEQ ID NO: 20 is substituted, preferably for lysine, or xi. the amino acid serine at position 41 of SEQ ID NO: 14 is substituted, preferably for asparagine, or xii. the amino acid glycine at position 43 of SEQ ID NO: 14 is substituted, preferably for glutamic acid, or xiii. the amino acid proline at position 50 of SEQ ID NO: 14 is substituted, preferably for serine, or xiv. the amino acid proline at position 55 of SEQ 1D NO: 14 is substituted, preferably for leucine, or xv. the amino acid glycine at position 57 of SEQ ID NO: 14 is substituted, preferably for aspartic acid, or xvi. the amino acid glycine at position 61 of SEQ ID NO: 14 is substituted, preferably for glutamic acid, or xvii. the amino acid arginine at position 65 of SEQ 1D NO: 14 is substituted, preferably for glutamine, or xviii. the amino acid arginine at position 65 of SEQ ID NO: 14 is substituted, preferably for stop signal, or xix. the amino acid proline at position 71 of SEQ ID NO: 14 is substituted, preferably for serine, or xx. the amino acid aspartic acid at position 46 of SEQ ID NO: 23 is substituted, preferably for asparagine or glycine, or xxi. the amino acid proline at position 56 of SEQ ID NO: 20 is substituted, preferably for serine, or xxii. the amino acid alanine at position 62 of SEQ ID NO: 17 is substituted, preferably for valine. i. the amino acid arginine at position 2 of SEQ ID NO: 23 is substituted, preferably for lysine, or ii. the amino acid serine at position 9 of SEQ ID NO: 14 is substituted, preferably for phenylalanine, or iii. the amino acid arginine at position 16 of SEQ ID NO: 14 is substituted, preferably for glutamine, or iv. the amino acid serine at position 24 of SEQ ID NO: 14 is substituted, preferably for leucine, or v. the amino acid alanine at position 25 of SEQ ID NO: 17 is substituted, preferably for threonine, or vi. the amino acid glutamic acid at position 29 of SEQ ID NO: 14 is substituted, preferably for lysine, or vii. the amino acid glycine at position 30 of SEQ ID NO: 14 is substituted, preferably for aspartic acid, or viii. the amino acid alanine at position 33 of SEQ ID NO: 14 or at position 32 of SEQ ID NO: 20 is substituted, preferably for threonine, or ix. the amino acid proline at position 35 of SEQ ID NO: 14 is substituted, preferably for leucine, or x. the amino acid glutamic acid at position 35 of SEQ ID NO: 20 is substituted, preferably for lysine, or xi. the amino acid serine at position 41 of SEQ ID NO: 14 is substituted, preferably for asparagine, or xii. the amino acid glycine at position 43 of SEQ ID NO: 14 is substituted, preferably for glutamic acid, or xiii. the amino acid proline at position 50 of SEQ ID NO: 14 is substituted, preferably for serine, or xiv. the amino acid proline at position 55 of SEQ 1D NO: 14 is substituted, preferably for leucine, or xv. the amino acid glycine at position 57 of SEQ ID NO: 14 is substituted, preferably for aspartic acid, or xvi. the amino acid glycine at position 61 of SEQ ID NO: 14 is substituted, preferably for glutamic acid, or xvii. the amino acid arginine at position 65 of SEQ 1D NO: 14 is substituted, preferably for glutamine, or xviii. the amino acid arginine at position 65 of SEQ ID NO: 14 is substituted, preferably for stop signal, or xix. the amino acid proline at position 71 of SEQ ID NO: 14 is substituted, preferably for serine, or xx. the amino acid aspartic acid at position 46 of SEQ ID NO: 23 is substituted, preferably for asparagine or glycine, or xxi. the amino acid proline at position 56 of SEQ ID NO: 20 is substituted, preferably for serine, or xxii. the amino acid alanine at position 62 of SEQ ID NO: 17 is substituted, preferably for valine.