Author
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Miller, Helen |
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Submitted to: Rice Technical Working Group Meeting Proceedings
Publication Type: Proceedings Publication Acceptance Date: 1/15/2008 Publication Date: 2/22/2010 Citation: Miller, H.B. 2010. A survery of postharvest yellowing in Southern U.S. rice cultivars. In: Proceedings 33rd Rice Technical Working Group Meeting, February 18-21, 2008, San Diego, CA. p. 109. Interpretive Summary: Technical Abstract: Rice endosperm can yellow during storage when moisture levels and temperatures are elevated. Although this postharvest yellowed (PHY), or stackburn, rice results in a reduction of monetary value, no study has investigated the inherent potential within rice germplasm collections for limiting PHY. A laboratory-scale method to test yellowing was used. A specified amount of milled or rough rice was put into a test tube, rinsed with water, and then incubated for four days at 70oC. The degree of coloring was measured through the glass tube with a colorimeter. The ability of a large number of southern U.S. rice varieties to yellow was tested using these conditions. Selected varieties from the same planting that had tested as low-yellowing or high-yellowing were retested using larger amounts and containers. The low-yellowing cultivars were still distinguishable from the high-yellowing cultivars. The cultivars retested all exhibited a high level of coloring indicating that a more diverse germplasm should be investigated to increase the likelihood of identifying low PHY varieties. |