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Types, Advantages and Disadvantages Article shared by: Read this article to learn about the pollination in plants: The transfer of pollen grains from the anther to the stigma is called pollination.
Pollen grains are immobile. They cannot reach the stigma by themselves. An external agent is required for this. It can be wind, water, animal, gravity or growth contact.
Theophrastus has written on pollination in Date Palm. Kolreuter recognised the significance of pollination in seed setting and role of insects in pollination.
It is the transfer of pollen grains from the anther of a flower to the stigma of either the same or genetically similar flower.
It is a type of self pollination in which an intersexual or perfect flower is pollinated by its own pollen. Autogamy is possible only when anther and stigma are close together and there is synchrony in pollen release and stigma receptivity. Autogamy occurs by three methods.
The anthers and stigmas of chasmogamous or open flowers are brought together by growth, bending or folding. Potato flowers show curling of style for carrying stigma to ripe anthers Fig.
When cross pollination fails in Sunflower, the bifid bent style stigma curls back so as to pick the pollen sticking to the surface of style Fig. It is fail safe mechanism of self pollination. The flowers are intersexual. They remain closed causing self pollination.
Cleistogamy occurs late in the flowering season in some plants, e. These plants, therefore, possess both chasmogamous and cleistogamous flowers. In cleistogamous flowers, the anthers dehisce inside closed flowers. Growth of style brings the pollen grains in contact with stigma.
Pollination and seed set are assured. Pollinators are not required. Anthers and stigmas of intersexual or perfect flowers ripen before the opening of the buds so that self pollination takes place as a rule, e.
It is a type of pollination in which pollen grains of one flower are transferred to the stigma of another flower belonging to either the same plant or genetically similar plant. In geitonogamy, the flowers often show modifications similar to ones found in xenogeny or cross pollination.
Advantages of Self Pollination: It maintains the parental characters or purity of the race indefinitely.
Self pollination is used to maintain pure lines for hybridisation experiments. The plant does not need to produce large number of pollen grains. Flowers do not develop devices for attracting insect pollinators.
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