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Title:   Author  item
                                            Bockelman, Harolditem
                                            Bonman, John
  Submitted to: Agronomy Abstracts
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 7/20/2004
                                    Publication  Date: 11/1/2004
                                    Citation: Bockelman, H.E., Bonman, J.M. GIS analysis of disease resistant barley landraces. American Society of Agronomy. 2005. Annual Meeting Abstracts No. 3766.Interpretive Summary:
                                Technical Abstract: Cultivated barley (Hordeum vulgare subsp. vulgare L.) accessions in the USDA-ARS National Small Grains Collection (NSGC) have been tested systematically for the past 20 years for reaction to several important diseases.  A GIS analysis of landrace accessions was conducted for sources of resistance to Barley Yellow Dwarf Virus (BYD); Stripe Rust (SR), caused by Puccinia striiformis f. sp. hordei; Net Blotch (NB), caused by Pyrenophora teres; and Spot Blotch (SB), caused by Bipolaris sorokiniana.  A total of 8,237 accessions were mapped to locality, 4,720 mapped to province-level, and 3,737 mapped to country-level.  'Centers of concentration' for sources of resistance were identified:  Ethiopia for all four diseases; western Turkey and the Caucasus for SR; and Eastern Asia for field resistance to NB.  SR resistance was also associated with accessions originating from high altitude regions in Ethiopia.  NB resistance from greenhouse assays and SR resistance were associated with many grain characteristic descriptors, such as black aleurone and lemma.  Winter habit was positively associated with resistance to NB field and greenhouse assays, SB greenhouse assays, SR, and negatively associated with BYD resistance.  Information from this study will be used to guide future NSGC acquisition and evaluation efforts.


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