Chalazogamy is a specific type of fertilization in plants where the pollen tube enters the ovule, not through the micropyle (the usual route), but through the chalaza.
Understanding Chalazogamy
The chalaza is the basal part of the ovule, connecting it to the ovary wall. Normally, the pollen tube enters the ovule through the micropyle, a small opening at the opposite end. However, in chalazogamy, the pollen tube takes a less direct route.
Key Features of Chalazogamy:
- Entry Point: The pollen tube penetrates the embryo sac via the chalaza.
- Alternative Fertilization Route: It represents an alternative to the more common porogamy (entry through the micropyle).
- Occurence: Observed in certain plant species.
Examples of Plants Exhibiting Chalazogamy:
While porogamy is the most common fertilization method, chalazogamy is found in certain plant species, including:
- Casuarina
- Juglans (Walnut)
- Some other members of the Amentiferae family
Significance of Chalazogamy:
Chalazogamy demonstrates the diversity of reproductive strategies in plants. While the specific evolutionary advantages of chalazogamy are not fully understood, it may offer an alternative route for fertilization under certain environmental conditions or in specific plant species.
