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Gamete fusion is facilitated by two sperm cell-expressed DUF679 membrane proteins

Cyprys, Philipp ; Lindemeier, Maria ; Sprunck, Stefanie



Abstract

Successful double fertilization in flowering plants relies on two coordinated gamete fusion events, but the underlying molecular processes are not well understood. We show that two sperm-specific DOMAIN OF UNKNOWN FUNCTION 679 membrane proteins (DMP8 and DMP9) facilitate gamete fusion, with a greater effect on sperm-egg fusion than on sperm-central cell fusion. We also show that sperm adhesion and sperm cell separation depend on egg cell-secreted EGG CELL 1 proteins.


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