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- 2005 Public Cooperator's Report NOTE: The information in this report is shared cooperatively. The data are not published, but are presented with the understanding that they will not be used in publications without specific consent of the public cooperator.
Raleigh, NC, November 2005 Progress Report North Carolina State University This report summarizes the research conducted under specific cooperative agreements between the ARS and N.C. State University. Additional details will be available in handouts at the December, 2005, cooperators meeting and the December, 2005, TSG meeting. This subproject is concerned with nine aspects of the overall GEM effort. (1) The development of GEM families from breeding crosses. (2) Making topcross seed of the families. (3) Setting up appropriate experiments to compare the topcross families with commercial and experimental checks. (4) Providing seed for these experiments to 15 additional GEM collaborators. (5) Growing the experiments ourselves at several locations. (6) Analyzing and summarizing our own and our collaborators data. (7) Selecting the better materials for subsequent‑year trials. (8) Increasing seed of better families, providing it to Ames and other GEM cooperators and to the NCRPIS. (9) Sampling allelic diversity from representative races not encompassed by GEM yield-trial efforts. 144 entries (out of 1086 tested) have been advanced from first year to second year trials in 2005, and 27 entries (out of 216 tested) advanced from second year to third year testing. In 2005, 12,421 yield trial plots were coordinated through Raleigh (4,013 planted at NC State locations). Approximately, 885 nursery rows, and 1020 isolation block rows were planted in 2005 at Raleigh. Nursery work involves 10 new breeding crosses and 10 additional breeding crosses derived from tropical inbred lines. In 2005, 19 GEM families were recommended to GEM Cooperators and provided from stocks furnished to Ames; five additional families were recommended and provided directly from Raleigh. We have continued routine screening of available tropical lines, as so little data are available to choose among them for use in GEM or other research. A summary of some of that work has been accepted as an invited article for the 50th anniversary issue of Maydica. In 2004, the effort to evaluate GEM breeding crosses for yield per se was continued as part of an overall effort to evaluate new material. Data from that study revealed a great spread in yield potential and heavily influenced our choices for 2005 nursery work. Direct tests of Breeding Cross F1s were continued in 2005, and data was obtained for 5 locations. The following crosses look reasonably promising:
In contrast, the following Breeding Cross F1s look as though they should be avoided:
Check performance and CVs are listed below:
In addition, a group of Breeding Cross F2s were tested. While testing F2s is a more questionable endeavor, nevertheless,
look like keepers, while
do not.
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