Inbred Line Development and Hybrid Evaluation in GEM Breeding Crosses

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Inbred Line Development and Hybrid Evaluation in
GEM Breeding Crosses

• James A. Hawk and Tecle Weldekidan
• Department of Plant and Soil Sciences University
  of Delaware

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Objectives

• To develop inbred lines from GEM breeding crosses
  with good per se and testcross performance,
  resistance to abiotic and biotic factors, and
  adaptation to the Mid-Atlantic and Corn Belt
  regions
• Evaluate testcross performance of lines derived
  from DKXL212N11a

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Conclusions and Future Outlook

• Based on yield results and per se evaluations,
  inbred lines DE4 and DKXL212N11a-197-1-1-1-1 may
  have potential for future line development.
• DE4 rated resistant for gray leaf spot and DE3
  rated intermediate.
• The 162 Stiff Stalk and 188 non-Stiff Stalk S2s
  will be testcrossed in 2002-3 winter isolation
  blocks, and hybrid evaluations will be conducted
  Summer 2003.