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Small-Scale Bread-Quality-Test Performance Heritability in Bread Wheat: Influence of High Molecular Weight Glutenin Subunits and the 1BL.1RS Translocation

Nishio, Z., Takata, K., Ito, M., Tabiki, T., Ikeda, T. M., Fujita, Y., Maruyama-Funatsuki, W., Iriki, N., Yamauchi, H.
Crop science 2007 v.47 no.4 pp. 1451-1458
Triticum aestivum, wheat, crop quality, breadmaking quality, heritability, glutenins, protein subunits, molecular weight, chromosome translocation, protein content, hardness, plant breeding
Small-scale bread-quality assays (grain protein content, SDS-sedimentation volume [SDSS], and single-kernel characterization system [SKCS] grain hardness) represent important tools in bread wheat (L.) breeding. The influence of high-molecular-weight glutenin (HMWG) subunits and the 1BL.1RS translocation on small-scale bread-quality assays and their heritability was investigated for F and F lines of two wheat populations. Lines with HMWG subunits 5+10 at showed significantly greater SDSS volume and SKCS hardness than those with subunits 2+12 or 4+12. Lines with HMWG subunit 20 at had a significantly lower SDSS volume than those with HMWG subunits 7+8 or 7+9. F lines bearing the 1BL.1RS translocation had significantly greater protein content. The distribution of SDSS volumes suggested that most bore the undesirable HMWG subunits 2+12, 4+12 or 20, but could be selected against if the SDSS volume <6.0 mL. For SDSS volume, lines with HMWG subunits 5+10 had greater heritability in upward screening, whereas those with HMWG subunits 2+12 or 4+12 had greater heritability in downward screening. The above screening criterion provides an excellent tool for bread quality-based wheat breeding, irrespective of hard × hard or hard × soft wheat crosses.