self incompatability in plants

2. Name:
Aman ullah
Sr no :
08
7th-PBG

3. Self-Incompatibility:

4. It is the failure of plant with normal pollens and
ovules to set seeds due to some physiological
hindrance due to which fertilization may not occur..

5. Reasons....
Three Reasons;.
Pollen grains may not germinate on stigma,,
If germination occur on stigma ,pollen tube may
be large,,
Pollen tube goes slow to the egg or not go...

9. 2-Types
Sporophytic Self-Incompatibility (SSI)
Gametophytic Self-Incompatibility (GSI)

12. 2) Gametophytic Self-Incompatibility (GSI)
This type of self incompatibility is controlled by
genetic constitution of gametes. Pollen grains are
unable to germinate on stigma with similar allele
as that of pollen
Mostly occur in nature . It occurs nearly in
potatoes,
Tomatoes
Cabbage
Clovers

14. GAMETOPHYTIC
(GSI)
Stigma is smooth and wet
outcome of the interaction between the
pollen tube and the style is determined by
the genotype of the pollen (gamete)
S-locus products are synthesized after
completion of meiosis
growth of the pollen tube arrests in the
style
SPOROPHYTIC
(SSI)
Stigma is papilate (hairy) and dry
 outcome of the interaction between the
pollen tube and the style is determined by
the genotype of the sporophyte (diploid
tissue)
S-locus products are synthesized before
completion of meiosis
growth of the pollen tube arrests at the
surface of the stigma

15. Elimination of SI
By doubling the chromosomes of the species as
S1 doubled S1S1
S1S2 S1S1S2S2
Identification of self compatible mutant plants
from a population of plants developed by same
seeds’’’
Incorporation of self compatible genes of relative
species or varieties of same species by back cross
method’’’

16. Transfer of mature pollen on immature stigma for
2 to 3 days then we get compatible plants,,
2) End of season:
High Temperature ;
At 60 ° c expose female part
Co2 concentration:
near the flower increases it

17. High humidity:
increase it
Salt spray:
In brasica ,cabbage
Nacl = 5 to 10 solution
e.g in cabbage, brasica