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| ACCESSION | PLANT NAME | TAXONOMY | ORIGIN | GENEBANK | IMAGE | AVAILABILITY | RECEIVED | SOURCE TYPE | SOURCE DATE | COLLECTION SITE | COORDINATES | ELEVATION | HABITAT | IMPROVEMENT LEVEL | NARRATIVE | | |
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| 0 | PI 643087 | 'Okfield' | Triticum aestivum L. subsp. aestivum | Oklahoma, United States | PVPO | | Not Available | 2006 | DEVELOPED | 2005 | | | | | Cultivar | Okfield was developed by crossing 2174 with a single plant selected for imazamox tolerance (commercial rate) from a F2 population with the pedigree, TXGH12588-120*4/FS4. Okfield is a F2-derived line that is phenotypically uniform, except for the segregation of plants either resistant (50%) or susceptible (50%) to biotype E or I greenbug (Schizaphis graminum Rondani) in the seedling stage. Resistant plants, which carry the Gb3 gene, are phenotypically indistinguishable from susceptible plants in the absence of the greenbug. Flag leaves of Okfield show high stay-green capacity, especially under high leaf rust (caused by Puccinia triticina Eriks) pressure that forces premature senescence of currently available cultivars with imazamox resistance. The high-molecular-weight glutenin-subunit signature for Okfield is 2*/6+8 and 7+9/5+10, compared with 2*/6+8/5+10 for 2174. While agronomic features of Okfield are similar to or superior to those of 2174, the test weight of Okfield is 4.3 kg/hL less than 2174, a cultivar known for its exceptionally high test weight patterns. Okfield reaches the heading stage 4 days later than AP502CL, a very early cultivar, and two days earlier than 2174. It shows an intermediate reaction to acid soils under field conditions with soil pH<4.3. Based on field observations in Oklahoma, Okfield is susceptible to leaf rust and to Wheat soilborne mosaic virus. Reaction to Barley yellow dwarf virus is intermediate, much like 2174. During the severe epidemic that occurred in 2005, it showed an intermediate reaction under natural infection to stripe rust caused by Puccinia striiformis f. sp. tritici. Based on greenhouse observations, Okfield is susceptible to tan spot (Pyrenophora tritici-repentis) and to septoria leaf blotch (Septoria tritici) but resistant to powdery mildew (Blumeria graminis f. sp. tritici). Reaction to natural field infestations of Hessian fly (Mayetiola destructor) is tolerant (similar to 2174), but seedling reactions to specific biotypes are unknown. | 1705258 | PI 643087 |