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. 2016 Dec 5;173(1):112–121. doi: 10.1104/pp.16.01571

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Figure 1. — Pollen tube guidance by the female gametophyte. A, Pollen tubes emerged from the pollen grain (PG) grow through the transmitting tract (TT) and emerge on the surface of the septum (ST) separating two ovary locules. Each pollen tube targets the ovule (OV) via the surface of the funiculus (FL) and the micropyle (MP) of the ovule. B, Two synergid cells (SYs) secrete many peptides, including attractant LUREs and ZmEA1, through the filiform apparatus (FA). The tip-growing pollen tube (PT) is activated by ovular arabinogalactan AMOR to respond to LURE attractant peptides in Torenia. The egg cell (EC) inhibits synergid cells from cell fate switching to the egg cell. CCG and CBP1 in the central cell (CC) control MYB98 expression in synergid cells and some Cys-rich peptide (CRP) expression in the central cell, the function of which remains unknown.