Difference between Xenogamy and Autogamy

Xenogamy and autogamy are different modes of pollination in higher plants. Let us look at their differences –

Xenogamy

Autogamy

Definition

Xenogamy is the process of pollination when pollen from a genetically different plant lands on the stigma of another flower.

Autogamy is the process of pollination when two gametes from the same flower undergo fertilization.

Type of Pollination

Cross Pollination

Self Pollination

Genetic Difference

The offspring produced is genetically different from parents.

An identical offspring is produced.

Pollinator

It requires help from external pollination agents like wind, water, air and insects.

This process does not require outside help from pollinators for landing of the pollen. The pollen sheds itself inside the flower, sometimes even before the flower opens.

Modifications

The flowers have bright colored petals and sweet nectar to attract the pollinators. The plants adapt spatial distance between anther and stigma to avoid self pollination.

The flowers adapt themselves to shed pollen grains directly onto the stigma.

Examples

Calotropis, papaya, Cucurbits

Arabidopsis, sunflower, orchid

Advantage

They produce genetically different offspring, therefore contributing to evolution.

They are not dependent on external agents for pollination.

Disadvantage

The efficiency of seed formation depends on the pollinating agents.

It creates an inbreeding depression due to self pollination.

Explore BYJU’S biology for more difference related articles.

Also see:

FAQs

What is the difference between Xenogamy and Allogamy?

Xenogamy is the pollination of pollen grains onto the stigma of a genetically different plant, whereas allogamy is the pollination of pollen grains on the stigma of another plant of the same species.

What is the difference between Xenogamy and Geitonogamy?

Geitonogamy is the pollination of pollen grains onto the stigma of another flower of the same plant, whereas xenogamy is the pollination of pollen onto the stigma of a genetically different plant.

What is the difference between Autogamy and Allogamy?

Autogamy and allogamy are self pollination methods. In autogamy pollination occurs in the same flower, whereas in allogamy pollination occurs in different flowers of the same plant.

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