siphonogamy

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siphonogamy

(ˌsaɪfənˈɒɡəmɪ)

(Botany) a mode of pollination in which pollen tubes develop to facilitate the passage of male cells to eggs

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The differences occur in pollen and pollen tube morphology, development and cell composition (Yatomi, et al., 2002; Fernando, et al., 2005; Williams, 2008), spenn delivery (zooidogamy and siphonogamy) (Norstog, 1977) and the duration of pollen germination and fertilization (Chamberlain, 1935; Donaldson & Bosenberg, 1995; Norstog & Nicholls, 1997).

Comparative Biology of Cycad Pollen, Seed and Tissue--A Plant Conservation Perspective

In both groups pollen germinates to produce a pollen tube, responsible for delivering the male gametes (either motile, in cycads and Ginkgo, or otherwise non-motile) to the female gametophyte in the process of siphonogamy. In flowering plants the pollen tube can travel a long distance leading to extended siphonogamy.

Extended siphonogamy; Araucariaceae, Tsuga, Saxagothaea.

Callose deposits in pollen tubes: an apparent necessity for extended siphonogamy, because it compartmentalizes the male gamete apparatus.