Micronutrient enrichment of rice grain through dihaploid breeding
2011
Canicosa, J.E.B. | Manito, C. | Inabangan, M.A. | Aldemita, V. | Lopena V. | Grewal, D. | Virk, P., International Rice research Inst., Los Banos, Laguna (Philippines)
Among the major nutritional problems common in rice-consuming countries are protein-energy malnutrition and iron, zinc, iodine and vitamin A deficiencies. It is estimitated that more than 2 billion people in the developing world are zinc-deficient. Since rice is the staple food for more than half of the world's population, even a small increase in its nutritive value would be highly beneficial for human health. Several strategies, including supplementation and fortification programs, are continuing to address this problem. Recently, breeding staples with high micronutrient content dubbed 'biofortification' has evolved as a new strategy to address micronutrient malnutrition. To accelerate the development of elite lines with increased micronutrient content, a breeding program based on anther culture-derived doubled haploids (DH) was initiated. More than 1500 DH lines were evaluated in the field; these came from 10 single crosses and backcrosses that involved popular rice varieties and donor lines. Selected DH lines underwent field evaluation during the 2010 dry season. Several DH populations have been genotyped using SSR markers and putative QTLs for zinc have been identified. The current status in developing micronutrient-enriched rice through dihaploid breeding is presented.
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