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Fertilized egg cells secrete endopeptidases to avoid polytubey

Yu, Xiaobo ; Zhang, Xuecheng ; Zhao, Peng ; Peng, Xiongbo ; Chen, Hong ; Bleckmann, Andrea ; Bazhenova, Anastasiia ; Shi, Ce ; Dresselhaus, Thomas ; Sun, Meng-xiang



Abstract

Upon gamete fusion, animal egg cells secrete proteases from cortical granules to establish a fertilization envelope as a block to polyspermy(1-4). Fertilization in flowering plants is more complex and involves the delivery of two non-motile sperm cells by pollen tubes(5,6). Simultaneous penetration of ovules by multiple pollen tubes (polytubey) is usually avoided, thus indirectly preventing ...

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