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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 701909 | 'L-74X' | Leymus hybr. | Utah, United States | W6 | | Not Available | 2023 | DEVELOPED | | | | | | | Basin wildrye is somewhat indeterminate and shatters its seed. To avoid shattering losses, growers tend to harvest basin wildrye seed prior to maximal physiological maturity. To resolve the intersecting problems of floral indeterminacy and seed shattering, USDA-ARS released the L-74X basin wildrye X creeping wildrye germplasm on August 26, 2021. While L-74X has a narrow genetic base due to a biparental cross in its history, it can be used to introgress the non-shattering recessive sh6 allele of creeping wildrye (2n = 4x = 28) into 4x basin wildrye and closely related 4x Leymus species. L-74X originated with hybridization between 4x populations of basin wildrye and creeping wildrye, while eight generations of recombination and natural selection restored fertility to the interspecific hybrid. Intentional selection led to fixation of the sh6 allele. Averaged across two years, shattering genotypes (Sh6/sh6) averaged 19.4% greater (P < 0.05) seed yield per spike 23 days after pollination (DAP), but by 95 DAP non-shattering genotypes (sh6/sh6) averaged 167% greater (P < 0.05) seed yield per spike. Germination increased from 72.1% at 23 DAP to 86.4% at 95 DAP. The sh6 allele allows seed growers to delay seed harvest, concomitantly reducing shattering losses and improving physiological seed quality | 2141276 | PI 701909 |