title: Molecular characterization and sequence diversity of genes encoding the large subunit of the ADP-glucose pyrophosphorylase in wheat (Triticum aestivum L.).
abstract: The large subunit of ADP glucose pyrophosphorylase (AGPase), the rate limiting enzyme in starch biosynthesis in Triticum aestivum L., is encoded by the ADP glucose pyrophosphorylase large subunit (AGP-L) gene. This was the first report on the development of three genome-specific primer sets for isolating the complete genomic sequence of all three homoeologous AGP-L genes on group 1 chromosomes. All three AGP-L genes consisted of 15 introns and 15 exons. The lengths of the structural genes from start to stop codon were 3334 bp for AGP-L-A1, 3351 bp for AGP-L-B1, and 3340 bp for AGP-L-D1. The coding region was 1569 bases long in all three genomes. All three AGP-L genes encoded 522 amino acid residues including the transit peptide sequences with 62 amino acid residues and the mature protein with 460 amino acid residues. The mature protein of three AGP-L genes was highly conserved. Three AGP-L genes were sequenced in 47 diverse spring and winter wheat genotypes. One and two haplotypes were found for AGP-L-D1 and AGP-L-A1, respectively. In total, 67 SNPs (single nucleotide polymorphisms) and 13 indels (insertions or deletions) forming five haplotypes were identified for AGP-L-B1. All 13 indels and 58 of the 67 SNPs among the 47 genotypes were located in the non-coding regions, while the remaining nine SNPs were synonymous substitutions in the coding region. Significant LD was found among the 45 SNPs and ten indels located from intron 2 to intron 3. Association analysis indicated that four SNPs were strongly associated with seed number per spike and thousand kernel weight.
authors.affiliation: Department of Plant Science, University of Manitoba, 66 Dafoe Road, Winnipeg, Manitoba, R3T 2N2, Canada.|Manitoba Agriculture, Food and Rural Development, Box 370 Swan River, Manitoba, R0L 1Z0, Canada.
authors.forename: Meghan K
authors.initials: MK
authors.lastname: Rose
authors.affiliation: Department of Plant Science, University of Manitoba, 66 Dafoe Road, Winnipeg, Manitoba, R3T 2N2, Canada. huangxiuqiang@yahoo.com.|Pioneer Hi-Bred Production LP, 12111 Mississauga Road, Caledon, Ontario, L7C 1X1, Canada. huangxiuqiang@yahoo.com.
authors.forename: Xiu-Qiang
authors.initials: XQ
authors.lastname: Huang
authors.affiliation: Department of Plant Science, University of Manitoba, 66 Dafoe Road, Winnipeg, Manitoba, R3T 2N2, Canada. Anita.Brule-Babel@umanitoba.ca.
authors.forename: Anita
authors.initials: A
authors.lastname: Brûlé-Babel
mesh_terms: D000595:Amino Acid Sequence; D017124:Conserved Sequence; D017931:DNA Primers / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics; D005091:Exons; D051599:Glucose-1-Phosphate Adenylyltransferase / Q000235:genetics*; D006239:Haplotypes; D054643:INDEL Mutation; D007438:Introns; D015810:Linkage Disequilibrium; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D014908:Triticum / Q000201:enzymology / Q000235:genetics*
chemical_list: D017931:DNA Primers; D018744:DNA, Plant; D010940:Plant Proteins; D051599:Glucose-1-Phosphate Adenylyltransferase
keywords: Association mapping; Grain yield; Haplotype; Linkage disequilibrium (LD); Nucleotide diversity; Single nucleotide polymorphism (SNP); Triticum aestivum