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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 | GSHO 1316 | Early maturity | Hordeum vulgare L. subsp. vulgare | Colorado, United States | NSGC |  | | 1994 | DONATED | 05/1994 | | | | | Genetic material | This gene controls the strong response of some cultivars to photoperiod. The Eam1 gene is described as a simply inherited dominant and the main factor for early maturity. Under long-day condition, a near-isogenic line with Eam1 is reported to be 7 to 8 days earlier than the eam1 line 'ea1'. The early maturity gene is weakly linked to the vrs1 (six-rowed spike 1) locus. In North Dakota, USA, progenies from crosses of Bowman to Hordeum vulgare subsp spontaneum and Coast, facultative winter, northern spring (from Finland and Alaska), and winter types of barley, extremely early segregates are found. A linkage between early maturity and malformed spikes (com2) is observed when an accession from the ICARDA-CIMMYT collection of barley freaks is backcrossed to Bowman. Positive linkage data are found also in progenies from some crosses between a line having the com2 - eam1 recombinant and early segregates from the above crosses. The Eam1 locus in barley is likely homoeologous to the Ppd1, Ppd2, and Ppd3 loci in wheat, which control strong photoperiod response. | 1513721 | GSHO 1316 |