What is meant by self incomapatability?
What is meant by self incomapatability?
Self Incompatibility
It refers to the failure of pollen to fertilize the same flower or other flower of the same plant, or
It is the failure of pollen tube to penetrate the full length of style and effect fertilization.
Self incompatibility is an important out breeding mechanism, which prevent auto gamy and produce allogamy. It has reported in more than 300 species belonging to 70 families. In self incompatibility non-fruitfulness or failure of fruit setting May occurs due to:
I) Pollen grain fails to germinate on the stigma.
II) Pollen grain germinates, but pollen tube fails to enter inside the stigma and style.
III) Sometimes pollen tube enters inside the style but growth is very slow.
IV) Pollen tube enters the ovule but there is no fertilization due to degeneration of eggs cells.
V) Sometimes fertilization is effected but embryo degenerate at very early stage.
Lewis (1954) has suggested various classification of self – incompatibility.
1) Heteromorphic system
2) Homomorphic system
a) Gametophytic control and
b) Sporophytic control
Self Incompatibility
It refers to the failure of pollen to fertilize the same flower or other flower of the same plant, or
It is the failure of pollen tube to penetrate the full length of style and effect fertilization.
Self incompatibility is an important out breeding mechanism, which prevent auto gamy and produce allogamy. It has reported in more than 300 species belonging to 70 families. In self incompatibility non-fruitfulness or failure of fruit setting May occurs due to:
I) Pollen grain fails to germinate on the stigma.
II) Pollen grain germinates, but pollen tube fails to enter inside the stigma and style.
III) Sometimes pollen tube enters inside the style but growth is very slow.
IV) Pollen tube enters the ovule but there is no fertilization due to degeneration of eggs cells.
V) Sometimes fertilization is effected but embryo degenerate at very early stage.
Lewis (1954) has suggested various classification of self – incompatibility.
1) Heteromorphic system
2) Homomorphic system
a) Gametophytic control and
b) Sporophytic control
