Method of Plant Breeding in Self Pollinated Plants – Multiple Crossing
It is complex system of crossing in which 8 to 16 parents are systematically crossed to develop new hybrid variety. Ex. Barley. Multiple crosses are produced by crossing pairs of parents, pairs of F1 and pairs of F1’s of F1’ s , till all parents are included into a common progeny.
A X B CX D E X F G X H
AB X CD EF X GH
ABCD X EFGH
This method of breeding help to accumulate more and more gene quickly from several parents. But some times undesirable combinations may be brought together, since large number of parents are involved. This can be avoided by selecting the desirable combination before including in crossing programme during each generation. These procedures will require a longer time to reach the final cross. Ex. Self Pollinated Crop like Wheat and Rice are common examples.