Difference between horizontal resistance and vertical resistance
Answers
•Difference between horizontal
resistance and vertical resistance :
a) HORIZONTAL RESISTANCE :
1) It is polygenic, and acts against all
races of blight.
2) It slows down the rate at which
disease increases in the field.
3) A slow rate of disease increase in
the field greatly enhances the
benefit from reducing the initial
inoculum.
4)Therefore, horizontal resistance
greatly enhances vertical
resistance:
horizontal resistance activates the
R-genes.
5)The R-genes have fallen into
disrepute because they were
used wrongly:
they were used to replace
horizontal resistance, whereas
they should be used only to
supplement in horizontal
resistance.
b) VERTICAL RESISTANCE :
1) It is oligogenic, and can be
overcome by a change of race
2) It reduces the initial amount of
inoculum from which the
epidemic begins.
3) It is conferred by the R genes.
*POLYGENIC means when one
character is influenced by one or
more genes.
*OLIGOGENIC means when one
character is influenced by few
genes.
Difference between horizontal resistance and vertical resistance:
- The differences between vertical and horizontal resistance lies in the specification of the race.
- When there is an absence or no interaction that is specific between the genotype of pathogen and the host then It comes under horizontal resistance due to the non specification of Race.
- The characterised and specific interaction between the pathogen genotype and the host gives rise to the presence of vertical resistance.
- Hence, the race specific interaction gives rise to this type of resistance.
To know more:
Difference between horizontal and vertical resistance
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