Difference between self pollination and cross pollination, hi guys in this article we know about what is self pollination and its meaning, cross pollination definition and difference between self and cross pollination.
The transfer of pollen grains from anther to stigma is known as pollination. when the pollen grains are shed from anther, they are disseminated by various Agencies, some of them may by one means or another, finally reach the stigma of pistil, either of same or another flower. Pollination ends when the Pollen has reached the stigma.
According to how the Pollen Grain reach to stigma of same flower or another flower pollination categorised into two category 1) self pollination and 2) cross pollination.
Difference between self pollination and cross pollination is plants are said to be self pollinated when the pollen is transferred from an anther to a stigma of same flower or to another flower born on same plant whereas cross pollination is defined as transfer of pollen from the anther of flower to stigma of flower of another plant.
Self pollination is only takes place in monoecious Plant or those plant bearing bisexual flower in which both male and female sex organ mature almost at same time. Self pollination further is two types 1) Autogamy & 2) Geitonogamy.
Difference between autogamy and geitonogamy is, the transfer of pollen grains from anther of flower to the stigma of same flower evidently bisexual is Autogamy, for example Pea, Wheat, Rice etc whereas Geitonogamy is defined as when pollen from one flower are deposited on the stigma of another flower which are born on same plant.
What is difference between self pollination and cross pollination
There are following difference between self pollination and cross pollination given in the following table:-
1) It is Migration of pollen grains from anther to stigma of same flower or another flower which are born on same plant.
2) if the Pollen transferred within same flower anther to stigma,there is no need of external agency in self pollination. if the Pollen Grain transferred from one flower to another flower which are born on same plant need external agency for their transferred. external agency like wind and touch help in self pollination.
3) Both anthers and stigma of a flower or another flower which are born on same plant mature almost at same time.
4) it is occurs in closed flower that is known as cleistogamous flower, race is almost constant homozygous and it give rise to pure lines and in preserve the parental characters.
5) origin of new species in self pollination is not possible because genetic material exchange within same trait within flower, genetic diversity and evolution not taking place if flower is self pollinated.
1) Migration of pollen grains from anther to stigma of another flower which is born on different plant.
2) cross pollination always occurs through and help of external agency like air, wind, insect, etc. in absence of external agency cross pollination does not takes place.
3) in cross pollinating flower anther and stigma mature at different time.
4) cross pollination occurs only when the flower are open, the race is changing, it is heterozygous, it gives rise to offspring having variation and different diversity, it does not preserve the parental character.
5) cross pollination help in giving rise to new races and variety, so evolution and Diversity lead to formation of new species. So there is possibility of evolution of new species in cross pollination.