Proceedings of the Tenth International Symposium on the Sexual Reproduction in Higher Plants, 30 may - 4 june 1988. University of Siena, Siena, Italy Contenido: Gene-expression and transcription. -- Pollen quality and selection. -- Gametophyte and sporophyte transformation and manipulation. -- Microsporogenesis and pollen development. -- Pollen tube and sperm cells. -- Stressed gametophyte. -- From pollination to fertilization. -- From ovule to seed. -- Embryology and taxonomy. -- Final remarks. -- Abstract of poster presentations. -- Author index. -- Subject index