Semi-dwarf hybrid sunflower seed and plant and method of producing hybrid seed

摘要

This invention relates to a novel semi-dwarf hybrid sunflower (Helianthus annuus var. macrocarpus (DC.) Ckll. (herein H. annuus) seed and a method of producing the hybrid seed. The hybrid sunflower seed upon growth yields a semi-dwarf sunflower plant having a reduced internode length. The hybrid seed is produced by cross pollinating a pair of parent plants P1 and P2 wherein, in at least one parent substantially all pollen is nonfunctional and at least one parent has gametes with nuclei carrying at least one dominant gene for reduced internode length.