International Database for Barley Genes and Barley Genetic Stocks
BGS 13, Desynapsis 4, des4
Stock number: BGS 13
Locus name: Desynapsis 4
Locus symbol: des4
Previous nomenclature and gene symbolization:
Monofactorial recessive (3, 4).
Located in chromosome 7H (1); des4.af is associated with SNP markers 1_0772 to 2_0790 (positions 71.81 to 73.96 cM) in 7H bin 05 and markers 2_0311 to 2_1448 (positions 126.28 to 134.43 cM) in 7H bin 08 of Bowman backcross-derived line BW240 (1); des4.d is associated with SNP markers 1_838 to 2_1201 (positions 49.53 to 134.43 cM) in 7H bins 04 to 08 of Bowman backcross-derived line BW241 (1), likely in 7H bin 08.
The chromosomes are paired during pachytene and undergo desynapsis during diplotene. The degree of desynapsis is d = 3.3 ± 2.2 with a range from 7 ring bivalents (d = 0) to 3 rod bivalents plus 8 univalents (d = 11). Many of the univalents split longitudinally during anaphase I, and lagging chromosomes and micronuclei are observed frequently at telophase I. Microspore tetrads contained an average of 1.0 micronuclei per tetrad and the micronuclei range was 0 to 10. Ovule fertility was about 18% (3). Plants of the Bowman backcross-derived line for des4.af, BW240, were similar to Bowman except grain yields were 25 to 50% lower. Kernels were about 10% lighter than those of Bowman in most trials (2).
Origin of mutant:
A spontaneous mutant in Betzes (PI 129430) (5, 6).
des4.d (GSHO 595), des4.h in Betzes (5, 6); des4.z, des4.aa, des4.ab, des4.ac, des4.ad, des4.ae, des4.af, des4.ag in Klages (CIho 15487) (4, 7); all the Klages mutants may be identical because they were isolated from the same field (4).
Mutant used for description and seed stocks:
des4.d GSHO 595) in Betzes; des4.d in Bowman (PI 483237)*5 (BW241, NGB 22068; des4.af in Bowman*7 (BW240, NGB 22067); des4.h in Bowman*2 (BW242, NGB 22069).
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. Franckowiak, J.D. (Unpublished).
3. Hernandez-Soriano, J.M. 1973. Desynaptic mutants in Betzes barley. M.S. Thesis. Univ. of Arizona, Tucson.
4. Hernandez-Soriano, J.M., and R.T. Ramage. 1974. Coordinator's report. Desynaptic genes. Barley Genet. Newsl. 4:123-125.
5. Ramage, R.T., and J.M. Hernandez-Soriano. 1971. Desynaptic genes in Betzes barley. Barley Genet. Newsl. 1:38.
6. Ramage, R.T., and J.M. Hernandez-Soriano. 1972. Desynaptic genes in barley. Barley Genet. Newsl. 2:65-68.
7. Scheuring, J.F., D.R. Clark, and R.T. Ramage. 1976. Coordinator's report: Desynaptic genes. Barley Genet. Newsl. 6:108-109.
J.M. Hernandez-Soriano, R.T. Ramage, and R.F. Eslick. 1973. Barley Genet. Newsl. 3:127.
R.T. Ramage and J.F. Scheuring. 1976. Barley Genet. Newsl. 6:116.
J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:58.
J.D. Franckowiak. 2011. Barley Genet. Newsl. 41:71-72.
J.D. Franckowiak. 2014. Barley Genet. Newsl. 44:54-55.