ARS | Publication request: Qtls for Phytate in Rice Grain and Their Relationship with Iron

Submitted to: International Crop Science Congress Proceedings
Publication Type: Proceedings
Publication Acceptance Date: July 1, 2004
Publication Date: September 1, 2004
Citation: Huynh, L., Stangoulis, J., Welch, R.M., Graham, R. 2004. Qtls for phytate in rice grain and their relationship with iron. International Crop Science Congress Proceedings. p. 13-27.

Technical Abstract: Phytate (inositol-hexa-phosphate) has an important role in plants yet it also has anti-nutritional properties in animals and humans. While there is debate within the plant breeding and nutrition community regarding an optimum level in grain, there appears to be little information at the molecular level for the genetics of this trait, and its association with other important trace elements, and in particular, Fe. In this study, quantitative trait loci (QTL) for grain phytate in glasshouse grown IR64 x Azucena doubled haploid population were identified. Correlations between phytate and essential nutrients were also studied. Transgressive segregation was found for most traits. Phytate and total P concentrations had two QTLs in common, located on chromosome 5 and 9 and contributed from IR64 and Azucena, respectively. The phytate QTL located on Chromosome 9 co-located with a high Fe QTL previously reported in the literature. There were significant positive correlations between phytate and inorganic phosphorus, total phosphorus, Fe, Zn, Cu and Mn for both grain concentration and content.