Submitted to: Rice Technical Working Group Meeting Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: February 29, 2004
Publication Date: February 1, 2005
Citation: Miller, H.B., Ledbetter, C.K. 2005. Stackburn in a test tube. Rice Technical Working Group Meeting Proceedings. Abstract p. 132. Technical Abstract: Stackburn, also known as burnt rice, rice yellowing, or amber grain, is a commercial storage problem of rice wherein the endosperm becomes yellow in conjunction with high temperatures and moisture. We have developed a technique to induce stackburn on a small scale by rinsing milled rice kernels with water and incubating them in test tubes or microfuge tubes at 70oC. This allows the visualization of the process and direct measurement of the color change using a Minolta Color Reader CR-10 colorimeter. Stackburn increased with temperature, tested through 80oC. Water distribution affected the pattern of color formation. Every rice cultivar tested, which included long and medium grain as well as japonicas and indicas, showed some level of stackburn. Despite reports of correlations of fungal presence with stackburn, no indications of fungal involvement were found using sterilization and culturing.