Submitted to: Rice Technical Working Group Meeting Proceedings
Publication Type: Proceedings
Publication Acceptance Date: February 5, 2008
Publication Date: March 1, 2008
Citation: Bergman, C.J., Goffman, F.D., Chen, M. 2008. Exploring the use of Oryza species to enhance the lipid fraction of cultivated rice. In: Proceedings of the 32nd Rice Technical Working Group Meetings, February 18-21, 2008, San Diego, CA. 2008. CDROM.
In the past few several years, efforts to collect rice germplasm were broadened to collect more widely from the Oryza genepool. The Oryza genus includes only 23 species, but it is remarkably diverse in-terms of its ecological adaptation. This diversity may not only be restricted to ecological characteristics but also to kernel end-use quality characteristics. This study evaluated Oryza species as a genepool for improving the lipids of rice grain. Several accessions of eleven Oryza species were grown in a green house, along with eight rice (Oryza sativa L.) accessions displaying low and high bran oil content as well as low and high palmitic acid content. The total lipid content of the Oryza species was within the levels found for Oryza sativa accessions. However, the level of palmitic acid in the Oryza species was as high as that reported for both soybean and flax high-palmitic acid mutants. The Oryza species also contained significant levels of the tocotrienol, tocopherol and gamma-oryzanol fractions. Thus, suggesting the lipid fraction of cultivated rice can be improved for the production of margarine, shortening and frying oils using Oryza wild species in targeted breeding efforts.