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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 1233 | btr1.a | Hordeum vulgare L. subsp. vulgare | North Dakota, United States | NSGC |  | | 1996 | DONATED | 04/1996 | | | | | Genetic material | Joints at the rachis nodes are tough or non-brittle, which prevents segmentation or disarticulation of the rachis prior to maturity. Plants homozygous for the btr1.a allele do not shatter prior to harvest in contrast to wild barley (Hordeum vulgare subsp spontaneum). All cultivars with the btr1.a allele have a dominant allele at the Btr2 locus. When crossed to cultivars with btr2.b allele at the Btr2 locus (genotype Btr1Btr1btr2btr2), F1 plants have a brittle rachis. The segregation ratio in the F2 generation is 1 brittle: 1 tough rachis. The majority of the cultivars distributed in Occidental region of the Old World have the btr1.a allele. Inheritance: Monofactorial recessive in crosses to Hordeum vulgare subsp. spontaneum. Located in chromosome 3HS, very close or semi-allelic to the Btr2 (brittle rachis 2) locus; the Btr1Btr2 complex is about 15.4 cM distal from the alm (albino lemma) locus. Previous nomenclature and gene symbolization: Non-brittle rachis=r. Non-brittle rachis=b. Non-brittle rachis 1=bt1. Mutational events: btr1.a in an unknown race of Hordeum vulgare subsp spontaneum; the line A222 (CIho 11555) is recommended as the source line for the btr1.a gene. Mutant used for description and seed stocks: btr1.a in A 222 (GSHO 1233); Btr1Btr2 from Wolfe's Multiple Dominant Marker Stock in Bowman (PI 4833237)*10 (GSHO 1937). | 1513891 | GSHO 1233 |
| 1 | GSHO 842 | btr2.b | Hordeum vulgare L. subsp. vulgare | Japan | NSGC |  | | 1994 | DEVELOPED | | | | | | Genetic material | Joints at the rachis nodes are tough or non-britle, which prevents segmentation or disarticulation of the rachis prior to maturity. Plants homozygous for the btr2.b allele do not shatter prior to harvest in contrast to wild barley (Hordeum vulgare subsp spontaneum). All cultivars with the btr2.b allele have a dominant allele at the Btr1 locus. When crossed to cultivars with the btr1.a allele at the Btr1 locus (genotype btr1btr1Btr2Btr2), F1 plants have a brittle rachis. The segregation ratio in the F2 generation is 1 brittle: 1 tough rachis. The majority of the cultivars (mostly six-rowed) distributed in Oriental region of the Old World have the btr2.b allele. Inheritance: Monofactorial recessive in crosses to Hordeum vulgare subsp spontaneum. Located in chromosome 3HS, very close or semi-allelic to the Btr1 (brittle rachis 1) locus; the Btr1Btr2 complex is about 15.4 cM distal from the alm (albino lemma) locus. Previous nomenclature and gene symbolization: Non-brittle=r. Non-brittle rachis=b. Non-brittle rachis 2=bt2. Mutational events: btr2.b in an unknown race of Hordeum vulgare subsp spontaneum. Mutant used for description and seed stocks: btr2.b in Sakigake (GSHO 842); btr2.b in Bowman (PI 483237); Btr1Btr2 from R.I. Wolfe's Multiple Dominant Marker Stock in Bowman*10 (GSHO 1937). | 1513875 | GSHO 842 |