A Brassica plant comprising at least two IND genes in two loci, or a cell, part, seed or progeny thereof, characterized in that it comprises at least two mutant IND alleles in a locus in its genome, in which said alleles Mutant INDs are mutant alleles of a gene encoding a functional IND protein, in which the functional IND gene comprises a nucleic acid molecule selected from the group consisting of: a. a nucleic acid molecule comprising at least 90% sequence identity with SEQ ID NO: 1, SEQ ID NO: 3 from the nucleotide at position 46 to the nucleotide at position 633, SEQ ID NO: 3, SEQ ID NO: 5, or SEQ ID NO: 7； and b. a nucleic acid molecule encoding an amino acid sequence comprising at least 90% sequence identity with SEQ ID NO: 2, SEQ ID NO: 4 from the amino acid at position 16 to the amino acid at position 210 or SEQ ID NO: 4, wherein said mutant IND alleles comprise a region of mutated DNA consisting of one or more nucleotides inserted, deleted or substituted as compared to a corresponding wild-type DNA region in the functional IND gene, and in which said mutant IND alleles do not encode a functional IND protein.Una planta de Brassica que comprende al menos dos genes IND en dos loci, o una célula, parte, semilla o progenie de la misma, caracterizada por que comprende al menos dos alelos IND mutantes en un locus en su genoma, en la que dichos alelos IND mutantes son alelos mutantes de un gen que codifica una proteína IND funcional, en la que el gen IND funcional comprende una molécula de ácido nucleico seleccionada del grupo que consiste en: a. una molécula de ácido nucleico que comprende al menos 90% de identidad de secuencia con SEC ID NO: 1, SEC ID NO: 3 desde el nucleótido en la posición 46 hasta el nucleótido en la posición 633, SEC ID NO: 3, SEC ID NO: 5, o SEC ID NO: 7； y b. una molécula de ácido nucleico que codifica una secuencia de aminoácidos que comprende al menos 90% de identidad de secuencia con SEC ID NO: 2, SEC ID NO: 4 desde el aminoácido en la p
