Abstract: The pollen tube behavior in the style following the hybridization between Cardiocrinum giganteum and Lilium were observed by means of fluorescence microscopy. The results indicated that the pollen of Lilium can germinated on the stigma of C. gaganteum and pollen tubes can reach the basal part of the style and finally arrive at the ovule in ovary, meanwhile, the result also showed that the speed of the pollen germination and pollen tube elongation following hybridization were much slower than that following intraspecificpollination, several abnormalities of pollen tubes were observed including pollen tubes with branching off, swollen or pointed tips, or superposition in the middle parts lots of callose depositiing at irregular distances, parts of pollen tubes became wave2liked at the middle or basal part of the style, which finally lead to the
failure to arrive at the ovary.

Key words: Lilium, Cardiocrinum giganteum, Pollen tube behavior, Fluorescence