Genotypic variation in milling depression of iron and zinc concentration in rice grain

• Published in: Plant and soil Vol. 361; no. 1-2; pp. 271 - 278
• Main Authors: Saenchai, Chorpet, Prom-u-thai, Chanakan, Jamjod, Sansanee, Dell, Bernard, Rerkasem, Benjavan
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Dordrecht Springer 01.12.2012; Springer Netherlands; Springer Nature B.V
• Subjects: Agronomy. Soil science and plant productions; Animal, plant and microbial ecology; Biological and medical sciences; Biomedical and Life Sciences; Crop production; Ecology; Embryos; Endosperm; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Genetic diversity; Genetic variation; Genotype & phenotype; Genotypes; Grain; Grain milling; Grains; Iron; Life Sciences; Nutrients; Oryza sativa; Plant Physiology; Plant Sciences; Regular Article; Rice; Soil Science & Conservation; Soil-plant relationships. Soil fertility; Soil-plant relationships. Soil fertility. Fertilization. Amendments; Staple foods; Wetlands; Zinc; Long-slender grain type; White rice; Milling loss; Brown rice; Degree of milling; Genetic variability; Grains; Depressions; Group VIII metal; Transition metal; Iron; Zinc; Group IIB metal; Type; Chemical concentration; Chemical properties; Soil plant relation
• ISSN: 0032-079X; 1573-5036
• DOI: 10.1007/s11104-012-1228-1

Background and aims The loss of iron and zinc during milling to produce white rice can have serious consequences for human health. Therefore, the objective was to evaluate Fe and Zn partitioning between the endosperm, bran and embryo, and the milling loss of these nutrients among Thai rice genotypes. Methods Concentrations of iron and zinc and their partitioning to different parts of the grain were examined in 15 genotypes of Thai rice (10 belonging to the long-slender grain type) grown together under wetland condition. Results The depression in grain Fe and Zn concentrations (24–60 and 10–58 %, respectively) on milling differed among rice genotypes and were affected by the extent of differential partitioning of Fe and Zn into different parts of the grain. For example, nearly 70 % of white rice Zn was allocated to the endosperm in contrast to only 43 % for Fe. Conclusions Because of variation in milling loss of Fe and Zn, that can result from genotypic variation in the degree of milling and partitioning of Fe and Zn into different parts of the grain, we conclude that white rice Fe and Zn concentrations should not be inferred solely from brown rice concentrations of these nutrients.