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The reproductive biology of Capparis retusa was studied by means of controlled pollination experiments and fluorescence microscopy observations of post-pollination events. Self-pollinated flowers mostly failed to form fruits despite the fact that self-pollen tubes grew to the ovary and penetrated ovules within 24 h. Since embryo development to globular stage was observed in some self-fertilized ovules it was concluded that control of self-fertilization in this species occurs by some kind of post-zygotic mechanism. A biologia reprodutiva da espécie Capparis retusa foi estudada por polinizações manuais e estudos de microscopia de fluorescência dos acontecimentos pós-polinização no pistilo. Flores auto-polinizadas, em sua maioria, não formaram frutos apesar do crescimento dos tubos até o ovário e penetração nos óvulos dentro de 24 h. Visto que também o desenvolvimento de embriões até a fase globular foi observado em alguns óvulos, concluiu-se que o controle de autofecundação nesta espécie atua por meio de algum tipo de mecanismo pós-zigótico

Late-acting self-incompatibility in Capparis retusa (Capparaceae), a species of Chaco woodland in NE Argentina