Effects of Water-soluble Extracts from Different Pistil Parts on Self-incompatibility Suppression in Pomlo (Citrus grandis)

Using Citrus grandis ‘Tuyou’ as the control, pollen germination and pollen tube growth status of Citrus grandis ‘Guanximiyou’ and ‘Duweimiyou’ in water-soluble extracts from different pistil parts from the same and different varieties were observed by fluorescent microscopy.The results showed that pollen tube growth was retarded and bent seriously by the water-soluble extracts of ‘Guanximiyou’ and ‘Duweimiyou’ ovaries,and were also affected by stigma extracts with moderate bent.The pollen tube grew normally in their-own styles extracts,showing only a slight bend.However,there were no such suppression effects on pollen tube growth in the water-soluble extracts of stigmas,styles, and ovaries for the pollens of different varieties and self-compatible variety ‘Tuyou’.