Identification of donors with favorable alleles for grain yield to improve inbreds in a Philippine maize breeding program
2007
Asoro. F.G. | Salazar, A.M. | Carpena, A.L. | Altoveros, N.C., Philippines Univ. Los Banos, College, Laguna (Philippines). Inst. of Plant Breeding
Selecting donor inbreds to improve elite single crosses is fundamental in line recycling in a maize hybrid breeding program.Elite donor inbreds from different sources were identified to improve the grain yield of Pi 17 x Pi23 (known as IPB 911,the first publicly released yellow single cross hybrid in the Philippines) and the different published estimators of favorable alleles were compared. The alleles were evaluated based on estimators such as modified microG, probability of net gain (PNG),minimum upper bound (UBND), net improvement (NI) predicted three-way cross (PTC) and general combining ability (GCA). Biplot analysis was used to combine the results of different estimators and to describe the estimator x genotype interactions. Top donors were identified with favorable alleles lacking in IPB 911 hybrid based on biplot of different estimators.The donors are CML172, CML432, CML487, CML451, Ki32, Nei 9008, CA 14520, CIMMYTTL8 and ARMP36. Comparison showed that microG was very highly correlated with NI (0.95) but moderately highly correlated (0.61-0.88) with other estimators.Based on genetic relationships values, the top donors belong to the Pi23 heterotic group.Inbred line development from BC1 or F2 populations between recipient and donor was recommended to recover favorable alleles that could be transferred to the recipient parent.This study has shown how the different estimators could be used in identifying donors to realize the short-term and long-term objectives of line recycling in corn hybrid breeding.
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