Process for producing seeds capable of forming F.sub.1 hybrid plants utilizing self-incompatibility

An improved process for producing seeds to make a predetermined F.sub.1 hybrid comprising:

• (a) growing in a planting area a randomly mixed population of parent plants which exhibit sporophytic self-incompatibility that are incapable of undergoing self-fertilization wherein the inability to undergo self-fertilization is attributable in each parent to at least two heterozygous dominant genetic determinants for sporophytic self-incompatibility that are different in each parent wherein said plants present in said planting area are capable of serving (1) as seed parents which following cross-pollination with pollen from the other parent plants bear seeds capable of forming predetermined F.sub.1 hybrid plants of a predetermined cultivar and (2) as pollen parents for the parent plants growing in said planting area,
• (b) cross-pollinating said plants growing in said planting area with pollen derived from the other parent plants growing in said planting area and forming seeds capable of producing a predetermined cultivar of F.sub.1 hybrid on said plants growing in said planting area as a result of said cross-pollination, and
• (c) harvesting in bulk said seeds that are capable of forming a predetermined cultivar of F.sub.1 hybrid plants that form on both parent plants of said planting area.