Principles of Plant Breeding (2+1)

Simple recurrent selection

• A number of desirable plants are selected and self pollinated. Separate progeny rows are grown from the selected plants in next generation. The progenies are intercrossed in all possible combination by hand. Equal amount of seed from each cross is mixed to raise next generation. This completes original selection cycle. From this, several desirable plants are selected and self pollinated. Progeny rows are grown and inter crosses made. Equal amount of seeds are composited to raise next generation. This forms the first recurrent selection cycle.

First Year:
i) Several superior plants are selected.
ii) Selected plants selfed.
iii) Harvest thesingle plants.
iv) Seedsare evaluated, superior plants are identified.

Second Year:
i) Progeny rows raised
ii) Inter crosses are made in all combination by hand.
iii) Equal amount of seed Recurrent bulked from each cross Selection Cycle.

Third Year:
i) Composited seeds raised
ii)Repeattheoperationasin firstyear

Fourth Year:
Repeat as in second year.
i) Recurrent selection is effective in increasing the frequency of desirable genes in the population
ii) Most suited for characters having high heritability.
iii) Inbreeding is kept at minimum.
Eg: oil content. Protein content and high heritability traits are affective for increasing the frequency of desireble genes in the selected populations