This article has been peer reviewed and accepted for publication. It is in production and has not been edited, so may differ from the final published form.
Grain mineral density of bread and durum wheat landraces from geochemically diverse native soils
Future progress on the creation of wheat cultivars with high grain zinc (Zn) and iron (Fe) mineral density will depend on both the availability of suitable donor germplasm and the identification of genes or QTLs contributing to increase the accumulation of mineral elements in the wheat kernels. Multi-environment field trials were conducted to evaluate the grain Zn, Fe and protein concentration of 32 bread wheat (Triticum aestivum L.) and 20 durum wheat (Triticum turgidum L. var. durum) landraces locally adapted to soils covering a wide range of pH values and mineral composition. These landraces were selected after a preliminary small-scale field trial that had analysed 425 Spanish local varieties. ANOVA tests have demonstrated a significant effect of the genotype on the grain composition, and 16 wheat landraces with elevated grain Zn and/or Fe density across the environments have been identified. These grain mineral-rich landraces represent valuable primary gene pool parents for wheat biofortification. No pattern of native soil geochemical characteristics, that could help to predict the success in collecting mineral dense genotypes on a given area, has been found. It is further considered that mapping populations derived from some pairs of grain mineral-rich and grain-mineral poor genotypes characterized in the study may facilitate the development of molecular markers to assist the selection of superior wheat genotypes.
CP17306 Accepted 22 December 2017
© CSIRO 2017