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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 593 | des2.b | Hordeum vulgare L. subsp. vulgare | Manitoba, Canada | NSGC |  | | 1994 | DEVELOPED | | | | | | Genetic material | Synapsed homologous chromosome disjoin precociously because of an apparent lack of chiasmata. The chromosomes are paired during pachytene and undergo desynapsis during diplotene. The degree of desynapsis is d=6.0+3.3 with a range from 7 ring bivalents (d=0) to 2 rod bivalents plus 10 univalents (d=12). Lagging chromosomes and micronuclei are observed frequently at Telophase I. Microspore tetrads contain an average of 1.8 micronuclei per tetrad and a range of 0 to 7. Ovule fertility is about 1% and highly variable from spike to spike on the same plant. The very low fertility trait occurred infrequently in the F2 progeny from the cross to Bowman, but about 1/4 the plants had about 60% seed set. Inheritance: Monofactorial recessive. Located in chromosome 3H. Previous nomenclature and gene symbolization: Desynaptic chromosomes=ds. Mutational events: des2.b in Husky. Mutant used for description and seed stocks: des2.b in Husky (GSHO 593). | 1512429 | GSHO 593 |