International Database for Barley Genes and Barley Genetic Stocks

BGS 629, Mottled leaf 6, mtt6

BGN  45:228
Stock number: BGS 629
Locus name: Mottled leaf 6
Locus symbol: mtt6

Previous nomenclature and gene symbolization:



Monofactorial recessive (2).
Located in chromosome 7HS (1); mtt6.g is associated with SNP markers 1_0851 to 2_1437 (positions 17.32 to 20.56 cM) in 7H bin 02 of the Bowman backcross-derived line BW604 (1).


When grown in the greenhouses, the mtt6.g seedlings are slightly pale green in color and develop a white necrotic region partially across the blade of the first leaf. Occasionally white necrotic blotches or region develop in subsequent leaf blades. Plants are taller than normal sibs and remain a slightly pale shade of green until maturity. Plant vigor appears normal (2). Plants of the Bowman backcross-derived line for mtt6.g, BW604, headed 1 to 4 days later than Bowman plants. BW604 plants varied from slightly taller to shorter, had slightly longer peduncles and larger leaf blades, and had 2 to 4 more kernels per spike. Compared to Bowman, kernels of BW604 were 5 to 10% lighter and grain yields varied from 30 to 95% of those for Bowman (2).

Origin of mutant:

A spontaneous mutant in selection ND6809 from a ND2654-31/Karl cross (2).

Mutational events:

mtt6.g (GSHO 2411) in ND6809-1 (2).

Mutant used for description and seed stocks:

mtt6.g (GSHO 2411) in ND6809; mtt6.g in Bowman (PI 483237)*8 (GSHO 2311, BW604, NGB 22170).


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 Franckowiak, J.D. (Unpublished).


J.D. Franckowiak. 2002. Barley Genet. Newsl. 32:130.
J.D. Franckowiak. 2015. Barley Genet. Newsl. 45:228.