The present invention concerns a method for increasing plant yield by modulating expression in a plant of a nucleic acid encoding a Ste20-like polypeptide or a homologue thereof. One such method comprises introducing into a plant a Ste20-like nucleic acid or variant thereof. The invention also relates to transgenic plants having introduced therein a Ste20-like nucleic acid or variant thereof, which plants have increased yield relative to control plants. The present invention also concerns constructs useful in the methods of the invention.