RRC ID 36348
Author Nishijima R, Iehisa JC, Matsuoka Y, Takumi S.
Title The cuticular wax inhibitor locus Iw2 in wild diploid wheat Aegilops tauschii: phenotypic survey, genetic analysis, and implications for the evolution of common wheat.
Journal BMC Plant Biol
Abstract BACKGROUND:Cuticular wax production on plant surfaces confers a glaucous appearance and plays important roles in plant stress tolerance. Most common wheat cultivars, which are hexaploid, and most tetraploid wheat cultivars are glaucous; in contrast, a wild wheat progenitor, Aegilops tauschii, can be glaucous or non-glaucous. A dominant non-glaucous allele, Iw2, resides on the short arm of chromosome 2D, which was inherited from Ae. tauschii through polyploidization. Iw2 is one of the major causal genes related to variation in glaucousness among hexaploid wheat. Detailed genetic and phylogeographic knowledge of the Iw2 locus in Ae. tauschii may provide important information and lead to a better understanding of the evolution of common wheat.
RESULTS:Glaucous Ae. tauschii accessions were collected from a broad area ranging from Armenia to the southwestern coastal part of the Caspian Sea. Linkage analyses with five mapping populations showed that the glaucous versus non-glaucous difference was mainly controlled by the Iw2 locus in Ae. tauschii. Comparative genomic analysis of barley and Ae. tauschii was then used to develop molecular markers tightly linked with Ae. tauschii Iw2. Chromosomal synteny around the orthologous Iw2 regions indicated that some chromosomal rearrangement had occurred during the genetic divergence leading to Ae. tauschii, barley, and Brachypodium. Genetic associations between specific Iw2-linked markers and respective glaucous phenotypes in Ae. tauschii indicated that at least two non-glaucous accessions might carry other glaucousness-determining loci outside of the Iw2 locus.
CONCLUSION:Allelic differences at the Iw2 locus were the main contributors to the phenotypic difference between the glaucous and non-glaucous accessions of Ae. tauschii. Our results supported the previous assumption that the D-genome donor of common wheat could have been any Ae. tauschii variant that carried the recessive iw2 allele.
Volume 14
Pages 246
Published 2014-9-16
DOI 10.1186/s12870-014-0246-y
PII s12870-014-0246-y
PMID 25224598
PMC PMC4172845
MeSH Alleles Biological Evolution Chromosome Mapping Chromosomes, Plant / genetics* Diploidy Genetic Linkage Genetic Loci / genetics Genetic Markers / genetics Genetic Speciation Genome, Plant / genetics* Genotype Hordeum / genetics Phenotype Plant Proteins / genetics* Poaceae / genetics* Species Specificity Synteny Waxes / metabolism
IF 3.497
Times Cited 11
Wheat KU-2154 KU-2003 KU-2811 KU-2827 KU-2069 KU-20-7 KU-20-8 KU-2086 KU-2106 KU-2111 KU-2112 KU-2118 KU-2124 KU-2126 KU-2155 KU-2156 KU-2158 KU-2159 KU-2160 KU-2104 KU-2105 KU- 3097 KU-3098 KU-3121 KU-3126 KU-3136 KU-3162 KU-3184 KU-3189 KU-3202 KU-3232 KU-3236 KU-3274 KU-3289 KU-10393 KU-10439 KU-10480 KU-10510 KU-2075 KU-2078 KU-2074 KU-2079 KU-2015