Method for improving a yield-related trait in a plant, wherein the yield-related trait is number of flowers, number of siliques, shoot growth, and/or seed yield, the method comprising: - introducing into the genome of a plant cell a disruption of endogenous ROCK1 gene, wherein said disruption inhibits expression and/or activity of a product of said endogenous ROCK1 gene compared to a corresponding plant cell lacking such a disruption, wherein the endogenous ROCK1 gene comprises or consists of: (a) a nucleic acid encoding a ROCK1 protein comprising or consisting of the amino acid sequence of SEQ ID NO: 1, 2 and/or 9 to 39; (b) a nucleic acid encoding a ROCK1 protein comprising or consisting of an amino acid sequence with a sequence identity of at least 90% over the entire amino acid sequence with SEQ ID NO: 1, 2 and/or 9 to 39; (c) a nucleic acid comprising or consisting of one of the nucleic acid sequences with SEQ ID NO: 4, 5, 6, 7 and/or 8; (d) a nucleic acid comprising or consisting of a nucleic acid with a sequence identity of at least 90% over the entire nucleic acid sequence with one of SEQ ID NO: 4, 5, 6, 7 and/or 8; or (e) a nucleic acid hybridizing under stringent conditions to one of the nucleic acid sequences defined under (a) and/or (c); and - regenerating a plant having such an altered genome from said plant cell; wherein the disruption is introduced by structural disruption, T-DNA insertion, antisense polynucleotide gene suppression, double stranded RNA induced gene silencing, ribozyme techniques, genomic disruption, tilling, transcriptional activator-like effector nucleases, zink finger nucleases, homing meganucleases, CRISPR/Cas technology. - introducing into the genome of a plant cell a disruption of endogenous ROCK1 gene, wherein said disruption inhibits expression and/or activity of a product of said endogenous ROCK1 gene compared to a corresponding plant cell lacking such a disruption, wherein the endogenous ROCK1 gene comprises or consists of: (a) a nucleic acid encoding a ROCK1 protein comprising or consisting of the amino acid sequence of SEQ ID NO: 1, 2 and/or 9 to 39; (b) a nucleic acid encoding a ROCK1 protein comprising or consisting of an amino acid sequence with a sequence identity of at least 90% over the entire amino acid sequence with SEQ ID NO: 1, 2 and/or 9 to 39; (c) a nucleic acid comprising or consisting of one of the nucleic acid sequences with SEQ ID NO: 4, 5, 6, 7 and/or 8; (d) a nucleic acid comprising or consisting of a nucleic acid with a sequence identity of at least 90% over the entire nucleic acid sequence with one of SEQ ID NO: 4, 5, 6, 7 and/or 8; or (e) a nucleic acid hybridizing under stringent conditions to one of the nucleic acid sequences defined under (a) and/or (c); and (a) a nucleic acid encoding a ROCK1 protein comprising or consisting of the amino acid sequence of SEQ ID NO: 1, 2 and/or 9 to 39; (b) a nucleic acid encoding a ROCK1 protein comprising or consisting of an amino acid sequence with a sequence identity of at least 90% over the entire amino acid sequence with SEQ ID NO: 1, 2 and/or 9 to 39; (c) a nucleic acid comprising or consisting of one of the nucleic acid sequences with SEQ ID NO: 4, 5, 6, 7 and/or 8; (d) a nucleic acid comprising or consisting of a nucleic acid with a sequence identity of at least 90% over the entire nucleic acid sequence with one of SEQ ID NO: 4, 5, 6, 7 and/or 8; or (e) a nucleic acid hybridizing under stringent conditions to one of the nucleic acid sequences defined under (a) and/or (c); and - regenerating a plant having such an altered genome from said plant cell; wherein the disruption is introduced by structural disruption, T-DNA insertion, antisense polynucleotide gene suppression, double stranded RNA induced gene silencing, ribozyme techniques, genomic disruption, tilling, transcriptional activator-like effector nucleases, zink finger nucleases, homing meganucleases, CRISPR/Cas technology.