Indian Society of Genetics & Plant Breeding

Comparison of methods to identify donor inbreds with favourable alleles for the improvement of elite maize single cross hybrids

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The success of single cross hybrids in maize primarily
rests on the economical seed production of its inbred
parents. Inbred parental improvement thus holds the key
in modern maize breeding programmes. Identification of
inbred lines (lw) as sources of favourble alleles not already
present in an elite hybrid (11 x 12) is one of the approaches
towards line enhancement in single cross hybrids. In
the present study, a minimally biased estimate of the
number of favourable alleles present in an inbred but not
present in an elite hybrid (1lG') was compared with minimum
upper bound estimates (UBND), net improvement statistic
(NI), predicted three-way performance (PTC), an unbiased
estimator based on combining ability model (lla[B+G]),
probability of net gain of favourable alleleS (PNGg), inbred
performance per se and general combining ability (GCA).
These estimators were applied to grain yield and related
characters among 45 F1's obtained from crossing ten
maize inbred lines. The relative efficiency of these
estimates was analyzed. The estimates, 1lG' and UBND
were found to be the best in ranking the donor inbreds
in a select group of five single crosses. A scheme for
possible utilization of these estimates for inbred line
enhancement of the target crosses is proposed.

Keywords: Maize, single cross hybrids, donor inbreds, favourable alleles


Year: 2003
Volume: 63
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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