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Published in Crop Sci 31:700-704 (1991)
© 1991 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of a Method for Identifying Sources of Favorable Alleles to Improve an Elite Single Cross

R. M. Hogan and J. W. Dudley*

* Corresponding author.

A method has been developed for estimating the value of donor lines or populations for improving an elite single cross. The method provides estimation of
Figure 1
: the relative number of dominant alleles in a potential donor line or population at loci for which an elite single cross to be improved is homozygous recessive. The method also allows estimation of
Figure 2
, and
Figure 3
: the relative numbers of alleles in a potential donor at loci for which the elite single cross is heterozygous. This experiment was conducted to determine whether these estimators correctly rank populations with known relative values of
Figure 4
. and
Figure 5
. Maize (Zea mays L.) hybrid FRB73 x FRMol7 was the elite single cross to be improved; 15 potential donors were selected. Populations containing 75, 50, and 25% germplasm from individual donors were produced by crossing each donor to FRB73 x FRMoI7 and backcrossing to each parent. Estimates of
Figure 6
, and kit
Figure 7
were obtained for grain yield, earliness of flowering, plant height, and ear height. For each donor, estimates were calculated for populations with 100, 75, 50, 25, and 0% donor germplasm (the 100% population was the donor and the 0% population was the elite single cross itself). These five populations correspond to proportions of 1.0, 0.75, 0.50, 0.25, and 0.0 times
Figure 8
, respectively. For
Figure 9
and
Figure 10
) and
Figure 11
are 0.5 in FRB73 FRMo17 and may be larger or smaller in the donor. Linear regression of estimates on proportion of donor germplasm was performed using the array of populations from each donor. In general, when estimates of
Figure 12
, or
Figure 13
for the donors (100% populations) were significantly different from those of the F1, the proportion of variation explained by linear regression was highly significant. In addition, when estimates of
Figure 14
were averaged across populations of each proportion, linear regression on proportion of donor germplasm accounted for 87 to 99% of the variation among mean estimates for all traits. Becausestimators precisely rank lines or populations relative to frequencies of useful new alleles to improve an elite single cross, they should be useful in selecting parents to improve single crosses.

Contribution from the Dep. of Agronomy, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801. Senior author supported in part by a J.E. Hackett Fellowship. Additional research support from Illinois Agric. Exp. Stn.

Received for publication June 14, 1990.


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