Write a note on selection.

Explanation

Oldest methods of plant breeding in which individual plants of groups of plants are sorted out from a mixed population based on the morphological characters.
There are three methods of selection.They are
1.Mass selection
2.Pure line selection
3.Clonal selection
(1)Mass selection:(i)Seeds of best plants showing desired characters are collected from a mixed population and allowed to raise the second generation.THis process is carried out for seven or eight generations.
(ii)At the end, They will be multiplied and distributed to the farmers for cultivation.
(iii)E.g: Groundant varieties like TMV-2 and AK-10.
(2).Pureline selection:
(i)Pureline is 'the progeny of a single individual obtained by self breeding',also called as individual plant selection.
(ii)In pureline selection,large numbers of plants are selected from a self-pollinated crop and harvested individually.
(iii)Individual plant progenies from them are evaluated separately.
(iv)The best one is released as pureline variety .
(v)Progeny is similar both genotypically and phenotypically.
(3)Clonal selection:
(i)A group of plants produced from a single plant through vegetative or asexual reproduction are caleed clones.
(ii)All the plants of a clone are similar both in genotype and phenotype.
(iii)Selection of desirable clones from the mixed population of vegetatively propagated crop is called clonal selection.