International Database for Barley Genes and Barley Genetic Stocks
BGS 660, Narrow leafed dwarf 2, nld2
Stock number: BGS 660
Locus name: Narrow leafed dwarf 2
Locus symbol: nld2
Previous nomenclature and gene symbolization:
Monofactorial recessive (2, 3).
Located in chromosomes 5H, 6H, or 7H (1); nld2.b is associated with SNP markers 1_0580 to 2_1121 (positions 54.27 to 105.91 cM) in 5H bins 03 to 06, with SNP markers 2_0743 to 2_0036 (positions 73.90 to 169.88 cM) in 6H bins 06 to 11, and with SNP markers 2_0242 to 2_1437 (positions 6.89 to 20.56 cM) in 7H bins 01 to 02 of the Bowman backcross-derived line BW636 (1).
The nld2.b plants have narrow, dark green leaf blades, which are erect with well-developed midribs. Auricles degenerate to tiny projections, but ligules are normal. Stem internodes are short, and the upper ones are curved. Spikelets are relatively narrow and small, and seed set may be low (2). Kernels of the Bowman backcross-derived line for nld2.b, BW636 were thinner (3.2 vs. 3.8 mm) and about 35% lighter than those of Bowman (2). BW 636 plants were 1/3 to 1/2 of normal height, and spikes commonly emerged from the side of the sheath before anthesis. Awns of BW636 plants are similar in length to those of Bowman. BW636 plants are more vigorous than those of the Bowman backcross-derived line for nld1.a (narrow leafed dwarf 1), BW635, in Christchurch, New Zealand and in North Dakota greenhouse nurseries, but nld1.a was more vigor in the field nursery at Dundee, Scotland. Grain yields of BW636 were often less than 20% of those of Bowman (2).
Origin of mutant:
A fast neutron induced mutant in Steptoe (CIho 15229) (3).
nld2.b (FN45, GSHO 3645) in Steptoe (CIho 15229) (3).
Mutant used for description and seed stocks:
nld2.b (FN45, GSHO 3645) in Steptoe; nld2.b in Bowman (PI 483237)*6 (BW636, NGB 22202).
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 Franckowiak, J.D. (Unpublished).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. Kleinhofs, A. (Unpublished).
J.D. Franckowiak and A. Kleinhofs. 2007. Barley Genet. Newsl. 37:300.
J.D. Franckowiak and A. Kleinhofs. 2013. Barley Genet. Newsl. 43:176.