Indian Society of Genetics & Plant Breeding

Comparison of various statistics for identification of maize inbreds with favourable alleles useful for the improvement of single cross hybrid in maize (Zea mays L.)

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Theory and methods for identifying inbred lines (Pw) where
favourable dominant alleles are not present in an elite
single cross hybrid (P
1 x P2) have recently been developed
and gaining popularity in modern maize breeding
programmes. In the present study, five methods are used
to estimate the number of favourable alleles present in
an inbred but not present in an elite hybrid namely
estimator of Dudley ()l G '), upper bound estimates (UBND),
predicted three way cross (PTC), net improvement statistic
(NI) and unbiased estimator based on combining ability
model ()la[B + G]) and were applied to a maize
10 x 10
diallel cross data. Besides these estimates, general
combining ability estimates and mean
per se value of the
donor inbreds were also used for comparison studies.
Results revealed that, though each and every method has
its own conceptual and computational advantages as well
as limitations, )l
G', NI, PTC and UBND, have higher inter
se correlations. Hence, it is indicated that anyone of
these methods can successfully select the donor with the
highest favourable alleles for the improvement of single
cross hybrid. In general, no association was found between
per se and all other estimates for all the three
characters under consideration. Similarly, GCA and )la (B
+ G) failed to exhibit closer association in grain yield per
plant and ear length.

Keywords: Maize, single cross, favourable alleles, )l G " UBND, PTe, NI


Year: 2005
Volume: 65
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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