Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: October 15, 2005
Publication Date: February 24, 2006
Citation: Hooks, T., Pedersen, J.F., Marx, D.B. 2006. Variation in the u.s. photoperiod insensitive sorghum collection for chemical and nutritional traits. Crop Science. Crop Sci. 46:751-757 Interpretive Summary: Approximately 4000 photoperiod insensitive sorghum lines (lines that will flower and set seed in temperate climatic zones) are held by the National Germplasm System. New technologies including Near Infrared Spectroscopy and application of geostatistical models make screening of those lines for chemical (starch, fat, crude protein, acid detergent fiber, phosphorous) and nutritional (total digestible nutrients, metabolizable energy, net energy gain, net energy maintenance, and net energy lactation) content efficient. We used these technologies to: 1) generate chemical and nutritional values for lines in the U.S. photoperiod insensitive sorghum collection, 2) describe variability for those traits, 3) select accessions in the highest 1% and lowest 1% for each trait, and 4) describe relationships among the accessions. Lines with the best nutritional value or chemical value were identified using advanced statistical techniques for use in developing improved parental lines and hybrids. The observed values for all lines evaluated were entered onto the USDA, ARS, GRIN database (http://www.ars-grin.gov/cgi-bin/npgs/html/desclist.pl?69) to permit free access to these data. Availability of these data will enhance utilization of this biological resource by industry.