BARLEY GENETICS NEWSLETTER - GrainGenes

Barley Genetics Newsletter (2008) 38:103-133
the epithelium of germinating seeds is important for α-amylase expression and cloned
HvGA3ox2, which encodes the key enzyme. Another region on 6H important for malt quality
is a QTL for grain protein content (Qgpc6H). This was first described by See et al. in 2002
who mapped the low protein gene contributed by the cultivar ‘Karl’ (CIho 15487) on the
‘satellite’ of 6H near the anchor markers abg458, hvm74 and mwg2029. Work on this region
by Distelfeld et al. in 2008 found colinearity between the barley grain protein content QTL
and the wheat Gpc-B1 region and suggested that the barley NAC transcription factor is
responsible for the protein content trait.
Perovic et al. (2007) mapped nine members of a multigene family for nicotianamine synthase
(NAS) in barley, three of which fell on 6H. Nicotianamine works as a chelator for iron and
other heavy metals. Co-linearity with rice suggests that this gene went through at least one
duplication event prior to the divergence of barley and rice.
References:
Abu Qamar, M., Z.H. Liu, J.D. Faris, S. Chao, M.C. Edwards, Z. Lai, J.D.
Franckowiak, and T.L. Friesen. 2008. A region of the barley chromosome 6H
harbors multiple major genes associated with net type net blotch resistance. Theor
Appl Gen. In press.
Babb, S. and G.J. Muehlbauer. 2003. Genetic and morphological characterization of the
barley uniculm2 (cul2) mutant. Theor. Appl. Gen. 106:846-857.
Coventry, S.J., H.M. Collins, A.M. Barr, S.P. Jefferies, K.J. Chalmers, S.J: Logue, and
P. Langridge. 2003. Use of putative QTLs and structural genes in marker assisted
selection for diastatic power in malting barley (Hordeum vulgare L.) Aust. J. Agr.
Res. 54:1241-1250.
Distelfeld, A., A. Korol, J. Dubcovsky, C. Uauy, T. Blake, and T. Fahima. 2008.
Colinearity between the barley grain protein content (GPC) QTL on chromosome arm
6HS and the wheat Gpc-B1 region. Mol. Breed. 22:25-38.
Grewal, T.S., B.G. Rossnagel, C.J. Pozniak, and G.J. Scoles. 2007. Mapping quantitative
trait loci associated with barley net blotch resistance. Theor Appl Gen 116: 529-539.
Le Gouis, J., P. Devaux, K. Werner, D. Hariri, N. Bahrman, D. Béghin, and F. Ordon
2004. rym15from the Japanese cultivar Chikurin Ibaraki 1 is a new barley mild mosaic
virus (BaMMV) resistance gene mapped on chromosome 6H. Theor. Appl. Genet.
108:1521-1525.
Marcel, T.C., R.K. Varshney, M. Barbieri, H. Jafary, M.J.D. de Kock, A. Graner,
and R.E. Niks. 2007. A high-density consensus map of barley to compare the
distribution of QTLs for partial resistance to Puccinia hordei and of defence
gene homologues. Theor. Appl. Genet. 114-487-500.
Perovic, D., P. Tiffin, D. Douchkov, H. Bäumlein, and A. Graner. 2007. An integrated
approach for the comparative analysis of a multigene family: The nicotianamine
synthase genes of barley. Funct. Int. Gen. 7:169-179.
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