International Database for Barley Genes and Barley Genetic Stocks

BGS 302, Mottled leaf 2, mtt2

BGN  41:127
Stock number: BGS 302
Locus name: Mottled leaf 2
Locus symbol: mtt2

Previous nomenclature and gene symbolization:

Mottled leaf 2 = mt2 (3).


Monofactorial recessive (3).
Located in chromosome 5HL (3); mtt2.b is about 26.1 cM proximal from the srh1 (short rachilla hair 1) locus (3); mtt2.b is associated with SNP markers 2_0645 to 2_0850 (positions 134.85 to 157.13 cM) in 5H bins 08 to 09 of the Bowman backcross-derived line BW601 (1), likely in 5H bin 08.


Yellow to ivory bands, rarely necrotic, appear at emergence on the seedling leaf. They gradually disappear and are absent at heading (3). Expression is better when alternating temperatures occur, but even under constant temperatures, the tip of the first leaf is yellow or pale green (2). The Bowman backcross-derived line for the mtt2.b mutant, BW601, was agronomically and morphologically similar to Bowman (2).

Origin of mutant:

A Rad-Beryll induced mutant in Montcalm (CIho 7149) (3).

Mutational events:

mtt2.b (GSHO 1398, Alb Acc 285) in Montcalm (CIho 7149) (3).

Mutant used for description and seed stocks:

mtt2.b (GSHO 1398) in Montcalm; mtt2.b in Bowman*7 (GSHO 2099, BW601, NGB 22167).


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 Franckowiak, J.D. (Unpublished).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. Walker, G.W.R., J. Dietrich, R. Miller, and K. Kasha. 1963. Recent barley mutants and their linkages II. Genetic data for further mutants. Can. J. Genet. Cytol. 5:200-219.


T. Tsuchiya and T.E. Haus. 1971. Barley Genet. Newsl. 1:161.


J.D. Franckowiak. 1997. Barley Genet. Newsl. 26:253.
J.D. Franckowiak. 2011. Barley Genet. Newsl. 41:127.