A, Pollinated gynoeceum containing ovules. B, Magnification of black box in A: micropylar pole of unfertilized female gametophyte containing synergids (s), egg cell (ec), and central cell (cc). C, reception of the pollen tube triggers PCD of the first synergid. D, fertilization of egg and central cell is required for PCD of the second synergid and the establishment of a pollen tube block. Pollen (A), pollen tube (C, D), sperm cells (D), yellow.
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