Estimating the individual effects of the reduced palmitic acid fapnc and fap1 alleles on agronomic traits in two soybean populations

Estimating the individual effects of the reduced palmitic acid fapnc and fap1 alleles on agronomic traits in two soybean populations

2008

A:PS

Major tap alleles that reduce palmitate content in soybean [Glycine max (L.) Merr.] seed oil also can reduce seed yield. One of these alleles, faPnc' has been shown to be a deletion in the GmFATB1a gene. Allele-specific primers that amplify GmFATB1a can be used to test precisely if the tap nc allele has an effect on agronomic traits. The objectives of this study were to determine if the segregation of the fapnc allele explained a significant amount of genetic variation in several agronomic traits; to determine if the fap1 allele or minor palmitate genes have an effect on agronomic traits; and to confirm if GmFATB1a maps to the distal region on linkage group A1. GmFATB1a-specific primers were used to genotype lines from two populations segregating for fapnc' fap1, and fan alleles and modifier genes. The fapnc allele explained a significant portion of the genetic varia in seed yield, plant height, protein content, and stearic acid content in both populations. After removing the effect of fapnc from the model, the genetic correlation between palmitate and yield was significant in one population but not significant between palmitate and height, indicating that fap1 has a small but significant effect on seed yield but no effect on plant height. The fap1 and!or modifier genes significantly affected stearic acid content. GmFATB1a mapped 20 cM distal to Satt684 on linkage group A1. Breeding effor did not totally eliminate the negative influence of the tap nc allele on seed yield and plant heiaht.

v.48(2):633-639, CROP SCIENCE

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