Indian Society of Genetics & Plant Breeding

EVALUATION OF STRAINS OF WHEAT DEVELOPED THROUGH PEDIGREE AND BACKCROSS METHODS

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PEDIGREE and backcross methods are being extensively used in plant breeding
work. In the backcross method, 6-10 backcrosses to the agronomically superior
recurrent parent were advocated (Briggs and Allard, 1953). But due to nonavailability of perfect parents good in all respects, and also due to the belief
that good segregates could be isolated even with fewer number of backcrossings,
many workers have adopted inrecent years the limited backcross method, which
calls for only two or three doses of backcrossing (Patterson, Schaffer, Caldwell
and Compton, 1957; Peterson, 1957, 1958; Ruderfand Wienhues, 1951; Borlaug,
1958). With this modification of the backcross technique, the genotype of the
hybrid is shifted towards the recurrent parent to a sufficient degree, at the same
time, deriving some transgressive improvement over the recurrent parent.
Campbell (1957) and Briggs (1958), however, have cautioned that this method
forfeits the security inherent in the conventional backcross method necessitating
extensive testing for yield, quality and adaptation.
 

Info

Year: 1966
Volume: 26
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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