Explain polyploid breeding.

Explanation

(i)An organism having more than two sets of chromosomes is called polyploid.Such condition is called polyploidy.
(ii) It can be induced by physical agent such as heat or cold treatmets,X-rays, Chemical agents like colchicine. Achievements of polyploidy breeding: (i)Seedles wtermelons (3n) and bananas (3n).
(ii)TV-29(triploidy variety of tea)With larger shoots and drought tolerance .
(iii)Tritcale (6n)is a hybrid wheat and rye.To make this plant fertile polyploidy is induce.It has higher dietary fibre and protein.
Raphano brassic is a allotetraploid by colchicine treatment.