Identifying populations useful for improving parents of a single cross based on net transfer of alleles |
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Authors: | R Bernardo |
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Institution: | (1) Lifaco Genetics RR1, Box 232A, 61821 Champaign, IL, USA |
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Abstract: | Summary Theory and methods for identifying populations (P
y
) with the highest frequency of favorable dominant alleles not present in an elite single cross (I
1× I
2) have been developed recently. During selection, new favorable alleles can be transferred from P
y
to either I
1 or I
2 only at the risk of losing favorable alleles already present in the single cross. A net improvement (NI) statistic, which estimates the relative number of favorable alleles that can be gained from P
y
minus the relative number of favorable alleles that can be lost from I
1 or I
2, is presented. NI is calculated as maximum (I
1×P
y
–I
1×I
2)/2,(I
2×P
y
–I
1×I
2)/2]. Because I
1 × I
2 is constant in an experiment, the method reduces to choosing P
y
populations with the best mean performance in combination with either I
1 or I
2. For a set of maize (Zea mays L.) grain yield data, NI was highly correlated to three other statistics proposed for choosing populations, namely: (1) minimally biased estimate (l
![mgr](/content/r79w461lx8k78115/xxlarge956.gif) ) of the relative number of favorable dominant alleles present in P
y
but not in I
1 and I
2; (2) minimum upper bound on l
; and (3) predicted performance of the three-way cross P
y
(I
1× I
2)]. While l
![mgr](/content/r79w461lx8k78115/xxlarge956.gif) estimates potential improvement likely to be achieved only through long-term recurrent selection, NI is probably a better predictor of short-term improvement in single-cross performance.A contribution from Lifaco Genetics, a subsidiary of Groupe Limagrain |
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Keywords: | Favorable alleles Populations Zea mays L |
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