title: Live imaging of calcium spikes during double fertilization in Arabidopsis.
abstract: Ca(2+) waves and oscillation are key signalling elements during the fertilization process of animals, and are involved, for example, in egg activation. In the unique double fertilization process in flowering plants, both the egg cell and the neighbouring central cell fuse with a sperm cell each. Here we succeeded in imaging cytosolic Ca(2+) in these two cells, and in the two synergid cells that accompany the gametes during semi-in vivo double fertilization. Following pollen tube discharge and plasmogamy, the egg and central cells displayed transient Ca(2+) spikes, but not oscillations. Only the events in the egg cell correlated with the plasmogamy. In contrast, the synergid cells displayed Ca(2+) oscillations on pollen tube arrival. The two synergid cells showed distinct Ca(2+) dynamics depending on their respective roles in tube reception. These Ca(2+) dynamics in the female gametophyte seem to represent highly specific signatures that coordinate successful double fertilization in the flowering plants.
authors.affiliation: 1] Division of Biological Sciences, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan [2] JST ERATO Higashiyama Live-Holonics Project, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan [3].
authors.forename: Yuki
authors.initials: Y
authors.lastname: Hamamura
authors.affiliation: Division of Biological Sciences, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.
authors.forename: Moe
authors.initials: M
authors.lastname: Nishimaki
authors.affiliation: 1] Division of Biological Sciences, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan [2] JST ERATO Higashiyama Live-Holonics Project, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.
authors.forename: Hidenori
authors.initials: H
authors.lastname: Takeuchi
authors.affiliation: Institut de recherche en biologie végétale, Département de sciences biologiques, Université de Montréal, 4101 Rue Sherbrooke est, Montréal, Québec, Canada H1X 2B2.
authors.forename: Anja
authors.initials: A
authors.lastname: Geitmann
authors.affiliation: 1] Division of Biological Sciences, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan [2] JST ERATO Higashiyama Live-Holonics Project, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kurihara
authors.affiliation: 1] Division of Biological Sciences, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan [2] JST ERATO Higashiyama Live-Holonics Project, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan [3] Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Higashiyama
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D020013:Calcium Signaling; D002135:Calcium-Binding Proteins / Q000378:metabolism; D003600:Cytosol / Q000378:metabolism; D005456:Fluorescent Dyes / Q000378:metabolism; D018613:Microscopy, Confocal / Q000379:methods; D057054:Molecular Imaging / Q000379:methods; D056771:Ovule / Q000166:cytology / Q000378:metabolism*; D053205:Pollen Tube / Q000166:cytology / Q000378:metabolism
chemical_list: D002135:Calcium-Binding Proteins; D005456:Fluorescent Dyes; C495639:yellow cameleon