International Database for Barley Genes and Barley Genetic Stocks
BGS 64, Desynapsis 7, des7
Stock number: BGS 64
Locus name: Desynapsis 7
Locus symbol: des7
Previous nomenclature and gene symbolization:
None.
Inheritance:
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).
Description:
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).
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. Franckowiak, J.D. (Unpublished).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.
Prepared:
J.M. Hernandez-Soriano, R.T. Ramage, and R.F. Eslick. 1973. Barley Genet. Newsl. 3:130.
Revised:
J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:100.
J.D. Franckowiak. 2013. Barley Genet. Newsl. 43:67.
