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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 | | |
|---|
| 0 | PI 637779 | 'Waxy-Pen' | Triticum aestivum L. subsp. aestivum | Washington, United States | PVPO |  | Not Available | 2005 | DEVELOPED | 2006 | | | | | Cultivar | Waxy-Pen was released due to its unique starch composition and end-use quality, and its potential for broad adaptation to U.S. Pacific Northwest environments.Waxy-Pen is a fully-waxy (< 1% amylose), back-cross-five derivative of the soft white spring wheat variety `Penawawa'. Penawawa (PI 495916; `Potam 70' / `Fielder') was developed by Dr. Calvin Konzak while at the Washington State University, Pullman, WA, and was released in 1985. Penawawa is null for the granule-bound starch synthase (GBSS) (Waxy) gene on chromosome 4A (genotype = Wx-A1a, Wx-B1b, Wx-D1a). The donor of the two additional GBSS null alleles (Wx-A1b, Wx-D1b) was the soft red spring wheat germ plasm line `WQL6K107-BHWX 2-2a' (PI 612545), which has the pedigree: `Kanto 107' / `Bai Huo' (Kanto 107 is PI 631445, Bai Huo is PI 606717). Breeder seed of Penawawa-X was derived by bulking seed from 27 BC5F3-derived F5 field plots grown near Bozeman, Montana in 2004. The BC5F3 plants were derived from 10 randomly-selected BC5F2 spikes which had been assayed for homozygous waxy trait using I2/KI (stock solution of 0.1 M of each; working dilution in the range of 5-10 mM) on several kernels each. The kernels had a small portion of the distal brush end removed with a razor blade and the exposed endosperm was stained with iodine. Rust-colored, as opposed to dark purple color, was indicative of waxy starch. Waxy trait was confirmed on the BC5F5 seed. | 1670085 | PI 637779 |