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Journal of Heredity Advance Access published online on June 11, 2009
Journal of Heredity, doi:10.1093/jhered/esp030
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© The American Genetic Association. 2009. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Mapping of Quantitative Trait Loci for Grain Iron and Zinc Concentration in Diploid A Genome Wheat

Vijay K. Tiwari, Nidhi Rawat, Parveen Chhuneja, Kumari Neelam, Renuka Aggarwal, Gursharn S. Randhawa, Harcharan S. Dhaliwal, Beat Keller, and Kuldeep Singh

From the Department of Biotechnology, Indian Institute of Technology, Roorkee 247 667, Uttarakhand, India (Tiwari, Rawat, Neelam, Randhawa, and Dhaliwal); School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana 141 004, India (Chhuneja, Aggarwal, and Singh); and the Institute of Plant Biology, University of Zurich, Switzerland (Keller)

Address correspondence to Kuldeep Singh at the address above, or e-mail: kuldeep35{at}yahoo.com.

Micronutrients, especially iron (Fe) and zinc (Zn), are deficient in the diets of people in underdeveloped countries. Biofortification of food crops is the best approach for alleviating the micronutrient deficiencies. Identification of germplasm with high grain Fe and Zn and understanding the genetic basis of their accumulation are the prerequisites for manipulation of these micronutrients. Some wild relatives of wheat were found to have higher grain Fe and Zn concentrations compared with the cultivated bread wheat germplasm. One accession of Triticum boeoticum (pau5088) that had relatively higher grain Fe and Zn was crossed with Triticum monococcum (pau14087), and a recombinant inbred line (RIL) population generated from this cross was grown at 2 locations over 2 years. The grains of the RIL population were evaluated for Fe and Zn concentration using atomic absorption spectrophotometer. The grain Fe and Zn concentrations in the RIL population ranged from 17.8 to 69.7 and 19.9 to 64.2 mg/kg, respectively. A linkage map available for the population was used for mapping quantitative trait loci (QTL) for grain Fe and Zn accumulation. The QTL analysis led to identification of 2 QTL for grain Fe on chromosomes 2A and 7A and 1 QTL for grain Zn on chromosome 7A. The grain Fe QTL were mapped in marker interval Xwmc382-Xbarc124 and Xgwm473-Xbarc29, respectively, each explaining 12.6% and 11.7% of the total phenotypic variation and were designated as QFe.pau-2A and QFe.pau-7A. The QTL for grain Zn, which mapped in marker interval Xcfd31-Xcfa2049, was designated as QZn.pau-7A and explained 18.8% of the total phenotypic variation.

Key Words: biofortification • grain Fe • grain Zn • QTL mapping • T. boeoticum

Corresponding Editor: J. Perry Gustafson

Received September 10, 2008
Revised April 22, 2009
Accepted April 22, 2009


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