Facts for Prelims (FFP)
Source: DTE
Context: In a groundbreaking discovery, scientists have observed rapid evolution in a flowering plant, Viola arvensis (field pansy), in Paris, France. The plant is producing less nectar and smaller flowers to attract fewer pollinators, displaying signs of self-pollination.
What are the reason for the evolution?
Changes in the environment especially due to anthropogenic activities have limited the population of pollinators (such as Bees). In such a situation, plants evolve to self-pollinate itself.
What is Self-pollination?
It is a reproductive process in plants where pollen from a flower’s male reproductive organs (anther) fertilizes the female reproductive organs (stigma) of the same flower or another flower on the same plant.
- The mechanism ensures the plant’s ability to reproduce without relying on external pollinators like insects or wind.
Mechanism of the Self-Pollination:
- Anther and Stigma Proximity: In self-pollinating plants, the anther (producing pollen) is close to the stigma (receiving pollen) within the same flower.
- Pollen Transfer: Pollen grains are transferred from the anther to the stigma, either by physical contact or through the plant’s internal mechanisms.
- Fertilization: The pollen tube grows down the style to the ovary, where fertilization takes place, resulting in the formation of seeds.
- Genetic Similarity: Since both the pollen and the ovule come from the same plant, the offspring are genetically identical to the parent, leading to limited genetic diversity.
Self-pollination ensures reproductive success, especially in environments with limited pollinators, but it can also reduce genetic variability in plant populations and risk to the plant-pollinator interaction system.
