Allelic variation of the Waxy gene in foxtail millet [Setaria italica (L.) P. Beauv.] by single nucleotide polymorphisms

Van, K. and Onoda, S. and Kim, M.Y. (2008) Allelic variation of the Waxy gene in foxtail millet [Setaria italica (L.) P. Beauv.] by single nucleotide polymorphisms. Molecular Genetics and Genomics, 279 (3). pp. 255-266.

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Abstract

The Waxy (Wx) gene product controls the formation of a straight chain polymer of amylose in the starch pathway. Dominance/recessiveness of the Wx allele is associated with amylose content, leading to non-waxy/waxy phenotypes. For a total of 113 foxtail millet accessions, agronomic traits and the molecular differences of the Wx gene were surveyed to evaluate genetic diversities. Molecular types were associated with phenotypes determined by four specific primer sets (non-waxy, Type I; low amylose, Type VI; waxy, Type IV or V). Additionally, the insertion of transposable element in waxy was confirmed by ex1/TSI2R, TSI2F/ex2, ex2int2/TSI7R and TSI7F/ex4r. Seventeen single nucleotide polymorphims (SNPs) were observed from non-coding regions, while three SNPs from coding regions were non-synonymous. Interestingly, the phenotype of No. 88 was still non-waxy, although seven nucleotides (AATTGGT) insertion at 2,993 bp led to 78 amino acids shorter. The rapid decline of r 2 in the sequenced region (exon 1–intron 1–exon 2) suggested a low level of linkage disequilibrium and limited haplotype structure. K s values and estimation of evolutionary events indicate early divergence of S. italica among cereal crops. This study suggested the Wx gene was one of the targets in the selection process during domestication.

Item Type: Article
Uncontrolled Keywords: Foxtail millet, Genetic diversity, Linkage disequilibrium, Single nucleotide polymorphisms Waxy gene
Author Affiliation: Department of Plant Science, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul, 151-921, The Republic of Korea
Subjects: Crop Improvement > Genetics/Genomics
Divisions: Millet
Depositing User: Mr Siva Shankar
Date Deposited: 10 May 2013 03:03
Last Modified: 10 May 2013 03:03
Official URL: http://dx.doi.org/10.1007/s00438-007-0310-5
URI: http://eprints.icrisat.ac.in/id/eprint/10511

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