International Database for Barley Genes and Barley Genetic Stocks
BGS 119, Desynapsis 2, des2
Stock number: BGS 119
Locus name: Desynapsis 2
Locus symbol: des2
Previous nomenclature and gene symbolization:
Desynaptic chromosomes = ds (2, 3).
Inheritance:
Monofactorial recessive (2, 3).
Located in chromosome 3H (2, 3); des2.b is associated with SNP markers 1_0825 to 1_0312 (positions 61.77 to 173.82 cM) in 3H bins 05 to 11 of the Bowman backcross-derived line BW238 (1);
Located in chromosome 3H (2, 3); des2.b is associated with SNP markers 1_0825 to 1_0312 (positions 61.77 to 173.82 cM) in 3H bins 05 to 11 of the Bowman backcross-derived line BW238 (1);
Description:
Synapsed homologous chromosomes disjoin precociously because of an apparent lack of chiasmata (2). 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 (5). The very low fertility trait occurs infrequently in the F2 progeny from the cross to Bowman, but nearly 1/4 the plants show reduced seed set (about 60%) (4). Grain yields of the Bowman backcross-derived line for des2.b, BW238, varied from less than 10% to nearly 1/2 those of Bowman. BW238 and Bowman were similar for other morphological traits, except kernels weighed slightly more (4).
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Origin of mutant:
An X-ray induced mutant in Husky (CIho 9537) (2).
Mutational events:
des2.b (GSHO 593) in Husky (CIho 9537) (2, 6).
Mutant used for description and seed stocks:
des2.b (GSHO 593) in Husky; des2.b in Bowman (PI 483237)*5 (BW238, NGB 22065).
References:
1. Druka, A., J. Franckowiak, U. Lundqvist, N. Bonar, J. Alexander, K. Houston, S. Radovic, F. Shahinnia, V. Vendramin, M. Morgante, N. Stein, and R. Waugh. 2011. Genetic dissection of barley morphology and development. Plant Physiol. 155:617-627.
2. Enns, H., and E.N. Larter. 1960. Note on the inheritance of ds; a gene governing meiotic chromosome behaviour in barley. Can. J. Plant Sci. 40:570-571.
3. Enns, H., and E.N. Larter. 1962. Linkage relations of ds: A gene governing chromosome behaviour in barley. Can. J. Genet. Cytol. 4:263-266.
4. Franckowiak, J.D. (Unpublished).
5. Hernandez-Soriano, J.M. 1973. Desynaptic mutants in Betzes barley. M.S. Thesis. Univ. of Arizona, Tucson.
6. Ramage, R.T., and J.M. Hernandez-Soriano. 1972. Desynaptic genes in barley. Barley Genet. Newsl. 2:65-68.
2. Enns, H., and E.N. Larter. 1960. Note on the inheritance of ds; a gene governing meiotic chromosome behaviour in barley. Can. J. Plant Sci. 40:570-571.
3. Enns, H., and E.N. Larter. 1962. Linkage relations of ds: A gene governing chromosome behaviour in barley. Can. J. Genet. Cytol. 4:263-266.
4. Franckowiak, J.D. (Unpublished).
5. Hernandez-Soriano, J.M. 1973. Desynaptic mutants in Betzes barley. M.S. Thesis. Univ. of Arizona, Tucson.
6. Ramage, R.T., and J.M. Hernandez-Soriano. 1972. Desynaptic genes in barley. Barley Genet. Newsl. 2:65-68.
Prepared:
J.M. Hernandez-Soriano, R.T. Ramage, and R.F. Eslick. 1973. Barley Genet. Newsl. 3:125.
Revised:
J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:154.
J.D. Franckowiak. 2013. Barley Genet. Newsl. 43:84-85.
J.D. Franckowiak. 2013. Barley Genet. Newsl. 43:84-85.
