International Database for Barley Genes and Barley Genetic Stocks
BGS 493, Laxatum-jf, Lax-jf
Stock number: BGS 493
Locus name: Laxatum-jf
Locus symbol: Lax-jf
Previous nomenclature and gene symbolization:
Laxatum 253 = Lax-253 (5, 6).
Laxatum 255 = Lax-255.(5, 6).
Monofactorial dominant (4, 7).
Located in chromosome 4HS (1); Lax-jf.253 is associated with SNP markers 2_0145 to 2_1558 (positions 2.58 to 5.42 cM) in chromosome 4H bin 01 of the Bowman backcross-derived line BW466 (1). Based on translocation breakpoints, Lax-jf.255 was previously reported to have a weak linkage to chromosome 5H (8).
Rachis internodes of Lax-jf.255 were about 12% longer than those of Bonus (6). Spikes had a few sterile spikelets and the kernels were thin and angular (6). Plants of the Bowman backcross-derived line for Lax-jf.253, BW466, were slightly taller and had rachis internodes that were 5 to 10% longer (4.8 vs. 4.5 mm) (4). Compared to Bowman, the Lax-jf.253, BW466, plants had slightly shorter peduncles and 2 to 4 more kernels per spike. Kernels of BW466 were of similar size and weight as those of Bowman. Grain yields of BW466 were on average equal to those of Bowman (4).
Origin of mutant:
Lax-jf.255 is a propyl methanesulfonate induced mutant in Foma (NGB 14659, CIho 11333) (6, 9). Lax-jf.253 is an ethyl methanesulfonate induced mutant in Foma (1, 9).
Lax-jf.253 (NGB 116480, GSHO 1571), -jf.254 (NGB 116481), -jf.255 (NGB 116482 in Foma (NGB 14659, CIho 11333) (2, 3, 6, 7).
Mutant used for description and seed stocks:
Lax-jf.253 (NGB 116480, GSHO 1571) in Foma; Lax-jf.255 (NGB 116482) in Foma; Lax-jf.253 in Bowman (PI 483237)*3 (GSHO 2138); Lax-jf.253 in Bowman (PI 483237)*5 (BW466, NGB20696).
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. Ehrenberg, L., Å. Gustafsson, and U. Lundqvist. 1959. The mutagenic effects of ionizing radiations and reactive ethylene derivatives in barley. Hereditas 45:351-368.
3. Ehrenberg, L., Å. Gustafsson, and U. Lundqvist. 1961. Viable mutants induced in barley by ionizing radiations and chemical mutagens. Hereditas 47:243-282.
4. Franckowiak, J.D. (Unpublished).
5. Gustafsson, Å., A. Hagberg, U. Lundqvist, and G. Persson. 1969. A proposed system of symbols for the collection of barley mutants at Svalöv. Hereditas 62:409-414.
6. Larsson, H.E.B. 1985. Morphological analysis of laxatum barley mutants. Hereditas 103:239-253.
7. Larsson, H.E.B. 1985. Genetic analysis of laxatum barley mutants. Hereditas 103:255-267.
8. Larsson, H.E.B. 1985. Linkage studies with genetic markers and some laxatum barley mutants. Hereditas 103:269-279.
9. Lundqvist, U. (Unpublished).
H.E.B. Larsson and U. Lundqvist. 1986. Barley Genet. Newsl. 16:76.
U. Lundqvist and J.D. Franckowiak. 2017. Barley Genet. Newsl. 47:161-162.