Disclosed are hybrid Lactuca sativa seeds, plants and cells of said plants that have a male sterile genotype and are heterozygous for at least one distinct gene that provides a detectable phenotype. Said male sterile genotype involves at least one nuclear gene and said seed, plant or cell is heterozygous for the gene or genes at the origin of male sterility. Also disclosed is a method for producing are hybrid Lactuca sativa seeds.
