International Database for Barley Genes and Barley Genetic Stocks
BGS 677, Mottled leaf 7, mtt7
Stock number: BGS 677
Locus name: Mottled leaf 7
Locus symbol: mtt7
Previous nomenclature and gene symbolization:
Mottled seedling h = mtt.h (2).
Monofactorial recessive (2).
Located in chromosome 2HS (1); mtt7.h is associated with SNP markers 1_0326 to 2_0107 (positions 16.91 to 33.96 cM) in 2H bins 02 to 03 of the Bowman backcrossed-derived line BW595 (1).
Seedlings are weak and leaf blades have vertical chlorotic to necrotic streaks where chlorophyll development is poor. Plants are very weak, but can be grown to maturity under greenhouse conditions. Mutant plants have few tillers, short spikes and are 1/2 to 2/3 of normal height (2). The new gene symbol mtt7.h is suggested for the mutant because no other mottled mutant has a similar phenotype or is located in chromosome 2HS (1, 2).
Origin of mutant:
A fast neutron induced mutant in Morex (CIho 15773) (2, 3).
mtt7.h (MXM56) in Morex (CIho 15773) (2, 3).
Mutant used for description and seed stocks:
mtt7.h (MXM56) in Morex; mtt7.h in Bowman (PI 483237)*5 (BW595, NGB 22161).
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. 2010. Genetic dissection of barley morphology and development. Plant Physiol. 155:617-627.
2. Franckowiak, J.D. (Unpublished).
3. Zhang, L., T. Fetch, J. Nirmala, D. Schmierer, R. Brueggeman, B. Steffenson, and A. Kleinhofs. 2006. Rpr1, a gene required for Rpg1-dependent resistance to stem rust in barley. Theor. Appl. Genet. 113:847-855.
J.D. Franckowiak. 2012. Barley Genet. Newsl. 42:753.