Mesogamy in plants refers to a specific pathway the pollen tube takes to reach the ovule for fertilization. It's one of three ways pollen tubes can enter the ovary.
Mesogamy Defined
When the pollen tube gains entry into the ovule through the integuments, it is known as mesogamy. The integuments are the protective layers surrounding the ovule. According to the reference provided, mesogamy happens when the pollen tube doesn't enter via the micropyle (porogamy) or the chalaza (chalazogamy), but rather, directly through these protective outer layers.
In summary:
| Type of Pollen Tube Entry | Entry Point |
|---|---|
| Porogamy | Micropyle |
| Chalazogamy | Chalaza |
| Mesogamy | Integuments |
