Autogamy pollination definition and example with diagram, hi guys in this article we know about what is autogamy pollination definition, its example, its types and characteristics feature of cleistogamy and chasmogamy in flower.
As we know in flowering plant reproduction there is Union of haploid ovule with haploid pollen grain to form diploid zygote. How the the Pollen Grain reach to embryo sac for reproduction in flowering plant. Pollen Grain reach to embryo sac by itself or need pollinating agent by various means of animals, insects, Birds, water, bats and wind. Transfer of pollen grain by itself from Anther to stigma within same flower of same plant is known as self pollination.
Autogamy is type of self pollination which are made of Union of two Greek words, Auto + gamy, Auto means “self” and gamy means “marriage” or “union“. It means autogamy is “self marriage” or “self union” in which female gamete ovule and male gamete pollen grain are united and fused to form zygote that comes from same flower.
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Autogamy is a type of self pollination wherein pollen grains from anther of flower are transferred to the stigma of same flower.
Geitonogamy refers to pollination of pollen from anther of one flower to stigma of other flower, borne on the same plant, it is a type of self pollination between genetically similar but physically different flowers. Geitonogamy is type of cross pollination wherein pollens from one plant are transferred to stigma of flower borne on different plant of same species.
Flowers that open at maturity to facilitate exposure of pollen and stigma for cross pollination are referred to as chasmogamous flower, they are large, conspicuous colourful flowers with nectar/scent to attract pollinators.
Flowers that remain close to avoid cross pollination and exhibit modifications to facilitate self pollination are referred to as cleistogamous flowers. Thus, cleistogamous flowers are those that do not open at all and only autogamy occurs.
Autogamy pollination definition and example with diagram
Autogamy is type of self pollination which are made of Union of two Greek words, Auto + gamy, Auto means “self” and gamy means “marriage” or “union”. It means autogamy is “self marriage” or “self union” in which female gamete ovule and male gamete pollen grain are united and fused to form zygote that comes from same flower.
Autogamy definition: Autogamy is type of self pollination in which Pollen Grain is transferred from anther to stigma within same flower. Flower may be encircle with Petal or open, encircled or closed flower is known as Cleistogamous and open flower is known as chasmogamous and type of pollination is known as Cleistogamy and chasmogamy respectively. Flower in which autogamy pollination is undergoes is known as autogamous flower.
Autogamy examples: common examples of autogamy pollination are Sunflowers,orchids,peas,commelina, groundnut and tridax.
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Types of Autogamy pollination
Types of Autogamy pollination: There is two types of autogamy pollination 1) Cleistogamy and 2) Chasmogamy.
1) Cleistogamy:- cleistogamy is type of autogamy self pollination in which its Floral and reproductive parts of flower is closed or encircle with Petals or flower which never open. It is combination of two Greek word, Cleisto + gamy, cleisto means “closed” or “hidden” and gamy means “marriage” or “union”, so cleistogamy is “hidden marriage”.
Cleistogamy is a type of automatic self-pollination of certain plants that can propagate by using non-opening, closed flower self-pollinating flowers. Common examples of cleistogamy is found in flower Commelina benghalensis and Especially well known in peanuts, commelina benghalensis, peas, and pansy this behavior is most widespread in the grass family. However, the largest genus of cleistogamous plants is Viola.
2) Chasmogamy pollination: in this type of pollination there is a small chance of self pollination because flowers are remain open and their reproductive parts and floral structures are exposed and do not encircled with petals. Flowers that open at maturity to facilitate exposure of pollen and stigma for cross pollination are referred to as chasmogamous flower, they are large, conspicuous colourful flowers with nectar/scent to attract pollinators.
The example of the Chasmogamous flower are oxalis ,viola , peas, beans, hibiscus, groundnut,commelina flowers etc.