radiations (ike gamma radiations), and then selecting and using those plants that have

the desirable character as a source in breeding,

This process is called mutation breeding. In mung bean, resistance to yellow mosaic

virus and powdery mildew was induced by mutations.

(b) Biofortification

It is the method for developing crops with higher levels of vitamins, minerals proteins

and healthier fats to improve public health

Merits of Biofortification

(i) Itcan increase yields grown on the same or less acreage.

(ii) It can potentially improve nutritional value or other health benefits.

Demerits of Biofortiication

(i) Its successful implementation into saciety requires safe delivery systems, stable

policies, appropriate social infrastructures.

(ii) tt continued by financial support also.

(c) Tissue-Culture.

It is an in vitro technique for regeneration of a whole plant from any part of a plant by

growing It on culture medium under aseptic conditions.

Merits of Tissue Culture.

(i) Alarge umber of plants can be grown in short time,

(ii) Disease-tree plants can be multiplied.

(iii) Seediess plants can be multiplied.

(iv) The plants where sexual reproduction is absent may undergo somatic hybridisation

Demerits of Tissue Culture.

(i) Itrequires great expense because it needs latest techniques in the laboratory.

(ii) requires acclimatisation of plants grown by tissue culture to the external environment,

(iii) ttrequires special expertise.