Characterization of opaque2 modifier QTLs and candidate genes in recombinant inbred lines derived from the K0326Y quality protein maize inbred
Type
ArticleAuthors
Holding, David R.Hunter, Brenda G.
Klingler, John

Wu, Song
Guo, Xiaomei
Gibbon, Bryan C.
Wu., Rongling
Schulze, Jan Michele
Jung, Rudolf
Larkins, Brian A.
KAUST Department
Desert Agriculture InitiativeBiological and Environmental Sciences and Engineering (BESE) Division
Date
2010-11-13Online Publication Date
2010-11-13Print Publication Date
2011-03Permanent link to this record
http://hdl.handle.net/10754/561634
Metadata
Show full item recordAbstract
Quality protein maize (QPM) is a high lysine-containing corn that is based on genetic modification of the opaque2 (o2) mutant. In QPM, modifier genes convert the starchy endosperm of o2 to the vitreous phenotype of wild type maize. There are multiple, unlinked o2 modifier loci (Opm) in QPM and their nature and mode of action are unknown. We previously identified seven Opm QTLs and characterized 16 genes that are differentially up-regulated at a significant level in K0326Y QPM, compared to the starchy endosperm mutant W64Ao2. In order to further characterize these Opm QTLs and the genes up-regulated in K0326Y QPM, we created a population of 314 recombinant inbred lines (RILs) from a cross between K0326Y QPM and W64Ao2. The RILs were characterized for three traits associated with endosperm texture: vitreousness, density and hardness. Genetic linkage analysis of the RIL population confirmed three of the previously identified QTLs associated with o2 endosperm modification in K0326Y QPM. Many of the genes up-regulated in K0326Y QPM showed substantially higher levels of expression in vitreous compared with opaque RILs. These included genes associated with the upstream regulation of the ethylene response pathway, and a gene encoding a regulatory subunit of pyrophosphate-dependent fructose-6-phosphate 1-phosphotransferase, an adaptive enzyme of the glycolytic pathway. © 2010 Springer-Verlag.Citation
Holding, D. R., Hunter, B. G., Klingler, J. P., Wu, S., Guo, X., Gibbon, B. C., … Larkins, B. A. (2010). Characterization of opaque2 modifier QTLs and candidate genes in recombinant inbred lines derived from the K0326Y quality protein maize inbred. Theoretical and Applied Genetics, 122(4), 783–794. doi:10.1007/s00122-010-1486-3Sponsors
The research described in this manuscript was supported by grants from the USDA (CSREES 2004-35301-14537), DOE (DE-FG02-96ER20242) and Pioneer Hi-Bred to BAL. We thank Roberto Lizzaraga-Guerra for contributing to the creation of the genetic materials that were used in this analysis.Publisher
Springer NatureJournal
Theoretical and Applied GeneticsPubMed ID
21076810ae974a485f413a2113503eed53cd6c53
10.1007/s00122-010-1486-3
Scopus Count
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