title: Intraspecific unilateral incompatibility in Vicia faba L.
abstract: Unilateral incompatibility was discovered when crossing was attempted between different self-compatible types and subspecies of V. faba. Crossing in the direction female less self-fertile x male more self-fertile failed, whereas the reciprocal-crossing succeeded. Unilateral incompatibility developed with the evolution of less fertile and large seeded field bean types. How a cross fertilized (and self-incompatible) system may develop from a self fertilized one is discussed.The unilateral incompatibility in V. faba and other plant species is compared. The two-power competition hypothesis can explain all kinds of unilateral incompatibility reported so far in the literature. Breeding field beans for improved self-fertility is discussed.
authors.affiliation: Department of Agronomy, Faculty of Agriculture, Cairo University, Giza, Egypt.
authors.forename: M M
authors.initials: MM
authors.lastname: Abdalla