1. USDA-ARS, Dale Bumpers National Rice Research Center, P.O. Box 1090, Stuttgart, AR 72160. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable.
2. Corresponding author. Phone: 1-870-672-9300 (Ext. 227). Fax 1-870-673-7581. E-mail address: rbryant@spa.ars.usda.gov
3. USDA-ARS, Small Grains and Potato Germplasm Research Facility, Aberdeen, ID 83210.
4. Current address: BASF Corporation, Research Triangle Park, NC 27709.