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Abstract
In the double fertilization of angiosperms, one sperm cell fertilizes an egg cell to produce a zygote, whereas the other sperm cell fertilizes a central cell to give rise to an endosperm. There is little information on gamete membrane dynamics during double fertilization even though the cell surface structure is critical for male and female gamete interactions. In a recent study, we analyzed gamete membrane behavior during double fertilization by live-cell imaging with Arabidopsis gamete membrane marker lines. We observed that the sperm membrane signals occasionally remained at the boundary of the female gametes after gamete fusion. In addition, sperm membrane signals entering the fertilized female gametes were detected. These findings suggested that plasma membrane fusion between male and female gametes occurred with the sperm internal membrane components entering the female gametes, and this was followed by plasmogamy.
Acknowledgments
Figure 1 is reprinted with permission from J. Plant Res. Laser scanning microscopy images were acquired with an Olympus FV1000-D at RIKEN BSI-Olympus Collaboration Center. This study was supported by KAKENHI (22112515) to T.I. from JSPS, KAKENHI (22657017) to T.I. from JSPS and KAKENHI (21112008) to T.M. from MEXT.