International Database for Barley Genes and Barley Genetic Stocks

BGS 64, Desynapsis 7, des7

BGN  43:67
Stock number: BGS 64
Locus name: Desynapsis 7
Locus symbol: des7

Previous nomenclature and gene symbolization:



Monofactorial recessive (5).
Located in chromosome 3H (1, 2); des7.j is associated with the Btr1 (Brittle rachis 1) locus based on linkage drag (2); des7.j is associated with SNP markers 2_0742 to 1_0653 (positions 29.05 to 92.55 cM) in 3H bins 02 to 06 of the Bowman backcross-derived line BW246 (1). Previously des7.j was located in chromosome 2H (3).


The chromosomes are paired during the pachytene stage of microsporogenesis, but they undergo desynapsis during diplotene. The degree of desynapsis is d = 6.1 ± 2.6, ranging from 7 ring bivalents (d = 0) to 14 univalents (d = 14). Many univalents split longitudinally during anaphase I. Lagging chromosomes and micronuclei are observed frequently at telophase I. Microspore quartets contain an average of 3.0 micronuclei per tetrad with a range of 0 to 13. Female fertility is about 33%, and about 13% of the selfed seeds are trisomics (3). Grain yields of the Bowman backcross-derived line for des7.j, BW246, were 2/3 to 3/4 those of Bowman. BW246 and Bowman were similar for other morphological traits (2). Seed set for BW246 was about 50% when grown under greenhouse conditions (2).
No images

Origin of mutant:

A spontaneous mutant in Betzes (PI 129430) (4, 5).

Mutational events:

des7.j (GSHO 598) in Betzes (PI 129430) (5).

Mutant used for description and seed stocks:

des7.j (GSHO 598) in Betzes; des7.j in Bowman (PI 483237)*6 (BW246, NGB 22072).


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 Franckowiak, J.D. (Unpublished).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. Ramage, R.T., and J.M. Hernandez-Soriano. 1971. Desynaptic genes in Betzes barley. Barley Genet. Newsl. 1:38.
5. Ramage, R.T., and J.M. Hernandez-Soriano. 1972. Desynaptic genes in barley. Barley Genet. Newsl. 2:65-68.


J.M. Hernandez-Soriano, R.T. Ramage, and R.F. Eslick. 1973. Barley Genet. Newsl. 3:130.


J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:100.
J.D. Franckowiak. 2013. Barley Genet. Newsl. 43:67.