Insect resistance in host crop plants may be due to morphological , biochemical or physiological characteristics.
Give examples.
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Answer...
Here are the following examples →
- Hairy leaves → resistance to jassids in cotton & cereal leaf beetle in wheat
- Solid stems in wheat → resistance to stem sawfly
- smooth leaves and nectarless cotton → resistance to bollworms.
- High aspartic acid and low nitrogen and sugar content → resistance to stem borers.
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There is no cotton plant, whether wild or cultivated
which is completely resistant to all insect pests infestation. Induced
mutations, whether gene and/or chromosomal aberrations, on both insect
and plant can be utilized for the eradication of crop plant insects and
breeding for insect resistance in plants. Through irradation at specific
doses one can induce sterility or lethality either to the female or male
insect. It was found that chromosomal translocations could be utilized
as dominant lethals for the eradication of boll weevil through a care-
fully designed breeding programme If homozygous lines for a
number of translocations were mated when the offspring heterozygous for
a number of translocations over 98 per c ent of their gametes would he
lethal. Therefore, lethal gametes would be produced throughout their
entire life span. Eradication programmes including genetic manipulation
are being directed against both the boll weevil and the pink bollworm
Such methods require that the target insect population is
relatively low in number and confined in a specific locality and isolated
by geographical barriers, and there is no natural selection.
On the plant side induced mutations may manifest