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Current Category » Breeding of Field and Horticultural Crops

Genetics of Insect Resistance in Plant Breeding

The inheritance of insect resistance may be governed in three ways, viz, by  1) Oligogenes, 2) Polygenes, and 3) Cytoplasmic gene. Examples of oligogenic insect resistance include in wheat to Hessian fly and stem sawfly, in barley to green bugs, in alfalfa to pea aphid, in cotton to Jassids in raspberry to rubus aphid, in apple to woolly aphid etc. The oligogenic resistance from one host to another is simple.

In some cases, insect resistance is governed by several genes each gene having small and additive effect. Examples of polygenic insect resistance are: in wheat to cereal leaf beetle, in rice to stem borer, in maize to ear worm and leaf aphid, in alfalfa to spotted aphid, etc.

Sometimes, insect resistance is governed by cytoplasmic genes. Examples of insect resistance governed by cytoplasmic genes include resistance to European corn borer in maize and resistance is carried out.

Genetics of Insect Resistance in Some Crop Plants:

Genetic Control of Resistance

Crop Species

Insect Pest

Expression of Resistance

Biotype Known

Oligogenic

Wheat

Grenbugs

Id + m

+

 

 

Hessian fly

5 D + 5d

+

 

Barley

Grenbugs

2D

+

 

Rice

Plant hopper

2D + 2d

+

 

Maize

Corn borer

NK

-

 

Cotton

Jassids

Id + m

-

 

Alfalfa

Pea Aphid

Id + m

-

 

Raspberry

Rubus Aphid

ID

+

 

Apple

Woolly Aphid

ID

+

Polygenic

Wheat

Leaf beetle

NK

-

 

Rice

Stem borer

NK

-

 

Maize

Earworm

NK

-

 

 

Leaf Aphid

NK

-

 

Brassica

Aphid

NK

+

 

Alfalfa

Spotted Aphid

NK

-

Cytoplasmic

Maize

European

Cytoplasmic

-

 

 

Corn borer

 

-

 

Lettuce

Root Aphid

Cytoplasmic

-

     
D- Dominant, d- recessive, m-modifier, NK- Not known
+ - Resistance breaking biotype are known
-  - Resistance breaking biotype are not known.

Current Category » Breeding of Field and Horticultural Crops