Triticum dicoccoides: An important genetic resource for increasing zinc and iron concentration in modern cultivated wheat
Open Access
- 1 February 2004
- journal article
- research article
- Published by Informa UK Limited in Soil Science and Plant Nutrition
- Vol. 50 (7), 1047-1054
- https://doi.org/10.1080/00380768.2004.10408573
Abstract
One major strategy to increase the level of zinc (Zn) and iron (Fe) in cereal crops, is to exploit the natural genetic variation in seed concentration of these micronutrients. Genotypic variation for Zn and Fe concentration in seeds among cultivated wheat cultivars is relatively narrow and limits the options to breed wheat genotypes with high concentration and bioavailability of Zn and Fe in seed. Alternatively, wild wheat might be an important genetic resource for enhancing micronutrient concentrations in seeds of cultivated wheat. Wild wheat is widespread in diverse environments in Tarkey and other parts of the Fertile Crescent (e.g., Iran, Iraq, Lebanon, Syria, Israel, and Jordan). A large number of accessions of wild wheat and of its wild relatives were collected from the Fertile Crescent and screened for Fe and Zn concentrations as well as other mineral nutrients. Among wild wheat, the collections of wild emmer wheat, Triticum turgidum ssp. dicoccoides (825 accessions) showed impressive variation and the highest concentrations of micronutrients, significantly exceeding those of cultivated wheat. The concentrations of Zn and Fe among the dicoccoides accessions varied from 14 to 190 mg kg−1 DW for Zn and from 15 to 109 mg kg−1 DW for Fe. Also for total amount of Zn and Fe per seed, dicoccoides accessions contained very high amount of Zn (up to 7 μg per seed) and Fe (up to 3.7 μg per seed). Such high genotypic variation could not be found for phosphorus, magnesium, and sulfur. In the case of modern cultivated wheat, seed concentrations of Zn and Fe were lower and less variable when compared to wild wheat accessions. There was a highly significant positive correlation between seed concentrations of Fe and Zn. Screening different series of dicoccoides substitution lines revealed that the chromosome 6A, 611, and 5B of dicoccoides resulted in greater increase in Zn and Fe concentration when compared to their recipient parent and to other chromosome substitution lines. The results indicate that Triticum turgidum L. var. dicoccoides (wild emmer) is an important genetic resource for increasing concentration and content of Zn and Fe in modern cultivated wheat.Keywords
This publication has 34 references indexed in Scilit:
- Iron Deficiency: Causes, Consequences, and Strategies to Overcome This Nutritional ProblemBiological Trace Element Research, 2003
- Plant nutrition research: Priorities to meet human needs for food in sustainable waysPlant and Soil, 2002
- Evaluation of a High Grain Protein QTL from Triticum turgidum L. var. dicoccoides in an Adapted Durum Wheat BackgroundCrop Science, 2001
- The Consultative Group on International Agricultural Research (CGIAR) Micronutrients Project: Justification and ObjectivesFood and Nutrition Bulletin, 2000
- Differences in Zinc Efficiency among and within Diploid, Tetraploid and Hexaploid WheatsAnnals of Botany, 1999
- Zinc deficiency as a practical problem in plant and human nutrition in Turkey: A NATO-science for stability projectField Crops Research, 1999
- Effects of zinc fertilization and irrigation on grain yield and zinc concentration of various cereals grown in zinc‐deficient calcareous soilsJournal of Plant Nutrition, 1998
- Differential response of rye, triticale, bread and durum wheats to zinc deficiency in calcareous soilsPlant and Soil, 1997
- Role of rye chromosomes in improvement of zinc efficiency in wheat and triticalePlant and Soil, 1997
- Genetic Analysis of Quantitative Traits in Wild Emmer (Triticum turgidum L. var. dicoccoides)Crop Science, 1991