Abstract
Puroindolines, the tryptophan-rich proteins controlling grain hardness in wheat, appeared as two pairs of 13 kDa polypeptides in the Acid-PAGE (A-PAGE) and two-dimensional A-PAGE×SDS-PAGE patterns of starch-granule proteins from wild allotetraploid wheat Aegilops ventricosa Tausch. (2n = 4x = 28, genomes DvDvNvNv). Puroindoline pair a1 + a2 reacted strongly with an antiserum specific for puroindoline-a from common wheat (Triticum aestivum L.), whereas puroindoline pair b1 + b2 exhibited A-PAGE relative mobilities similar to that of puroindoline-b in Aegilops tauschii (Coss.), the D-genome donor to both common wheat and Ae. ventricosa. Puroindolines a2 and b1 were found to be encoded by alleles Pina-D1a and Pinb-D1h on chromosome 5Dv, respectively, whereas puroindolines a1 and b2 were assumed to be under the genetic control of chromosome 5Nv. Puroindoline a1 encoded by the novel Pina-N1a allele exhibited a high level of amino acid variation with respect to puroindoline-a. On the other hand, the tryptophan-rich region of puroindoline b2 encoded by allele Pinb-N1a showed a sequence change from lysine-42 to arginine, with no effect on the amount of protein b2 accumulated on the starch granules. A partial duplication of the pin-B gene (Pinb-relic) was identified about 1100 bp downstream from Pinb-D1 on chromosome 5Dv. The present findings are the first evidence of a tetraploid wheat species in which four puroindoline genes are expressed. The potential of Ae. ventricosa as a source of genes that may be used to modulate endosperm texture and other valuable traits in cultivated wheat species is discussed.
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Gazza, L., Conti, S., Taddei, F. et al. Molecular Characterization of Puroindolines and their Encoding Genes in Aegilops Ventricosa. Mol Breeding 17, 191–200 (2006). https://doi.org/10.1007/s11032-005-4886-3
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DOI: https://doi.org/10.1007/s11032-005-4886-3