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Polymorphisms in O-methyltransferase genes are associated with stover cell wall digestibility in European maize (Zea maysL.)

Polymorphisms in O-methyltransferase genes are associated with stover cell wall digestibility in European maize (Zea maysL.)
Abstract Background OMT (O-methyltransferase) genes are involved in lignin biosynthesis, which relates to stover cell wall digestibility. Reduced lignin content is an important determinant of both forage quality and ethanol conversion efficiency of maize stover. Results Variation in genomic sequences coding for COMT, CCoAOMT1, and CCoAOMT2 was analyzed in relation to stover cell wall digestibility for a panel of 40 European forage maize inbred lines, and re-analyzed for a panel of 34 lines from a published French study. Different methodologies for association analysis were performed and compared. Across association methodologies, a total number of 25, 12, 1, 6 COMT polymorphic sites were significantly associated with DNDF, OMD, NDF, and WSC, respectively. Association analysis for CCoAOMT1 and CCoAOMT2 identified substantially fewer polymorphic sites (3 and 2, respectively) associated with the investigated traits. Our re-analysis on the 34 lines from a published French dataset identified 14 polymorphic sites significantly associated with cell wall digestibility, two of them were consistent with our study. Promising polymorphisms putatively causally associated with variability of cell wall digestibility were inferred from the total number of significantly associated SNPs/Indels. Conclusions Several polymorphic sites for three O-methyltransferase loci were associated with stover cell wall digestibility. All three tested genes seem to be involved in controlling DNDF, in particular COMT. Thus, considerable variation among Bm3 wildtype alleles can be exploited for improving cell-wall digestibility. Target sites for functional markers were identified enabling development of efficient marker-based selection strategies.
- KWS Saat (Germany) Germany
- Iowa State University United States
- Iowa State University United States
- Bavarian State Research Center for Agriculture Germany
- KWS Saat (Germany) Germany
DNA, Plant, Genotype, maïs, digestibilité, Plant Science, Lignin, Polymorphism, Single Nucleotide, Zea mays, 333, Linkage Disequilibrium, zea mays, INDEL Mutation, Agronomy and Crop Sciences, Cell Wall, Research article, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, [SDV.BV] Life Sciences [q-bio]/Vegetal Biology, Genetic Association Studies, bioethanol, O-METHYLTRANSFERASE, Vegetal Biology, Models, Genetic, gène, Botany, Methyltransferases, Sequence Analysis, DNA, Logistic Models, Phenotype, biocarburant, QK1-989, paroi cellulaire, Sequence Alignment, Biologie végétale
DNA, Plant, Genotype, maïs, digestibilité, Plant Science, Lignin, Polymorphism, Single Nucleotide, Zea mays, 333, Linkage Disequilibrium, zea mays, INDEL Mutation, Agronomy and Crop Sciences, Cell Wall, Research article, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, [SDV.BV] Life Sciences [q-bio]/Vegetal Biology, Genetic Association Studies, bioethanol, O-METHYLTRANSFERASE, Vegetal Biology, Models, Genetic, gène, Botany, Methyltransferases, Sequence Analysis, DNA, Logistic Models, Phenotype, biocarburant, QK1-989, paroi cellulaire, Sequence Alignment, Biologie végétale
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