BGS 172, Short awn 5, lks5

Short awn 5 = lk5 (7).
Breviaristatum-2 = ari-2 (5, 6).
Breviaristatum-c = ari-c.2 (6, 13, 14).

Monofactorial recessive (6, 7).
Located in chromosome 4HL (15); lks5.f is about 6.9 cM distal from the Kap1 (Hooded lemma 1) locus (7, 9); lks5.f is near AFLP marker E4143-5 in subgroup 38 of the Proctor/Nudinka map (10); lks5.f is associated with SNP markers 1_0262 to 2_0072 (positions 76.26 to 95.92 cM) in 4H bin 06 of the Bowman backcross-derived line BW493 (2); ari-c.2 is associated with SNP markers 2_0289 to 2_1322 (positions 69.62 to 112.64 cM) in 4H bins 05 to 08 of the Bowman backcross-derived line BW040 (2), in 4H bin 06; lks5.p was isolated in genetic stocks BW474 and BW475 from the lel1 (leafy lemma 1) stock, G7118;, lks5.p is associated with SNP markers 2_1122 to 1_1019 (positions 47.80 to 183.54) in 4H bins 05 to 13 of the Bowman backcross-derived line BW474 (2); lks5.p is associated with SNP markers 2_0422 to 2_0072 (positions 38.41 to 95.92 cM) in 4H bins 04 to 06 of the Bowman backcross-derived line BW475 (2); in 4H bin 06.

Awns on both central and lateral spikelets are reduced to 1/4 or less of normal length in six-rowed cultivars (7). Only the central spikelets exhibit reduced awn length in two-rowed cultivars (3, 6). The rachilla is often modified, and in extreme cases the rachilla may develop as a malformed additional floret (7). Awns are thin and brittle 6). Plants of the Bowman backcross-derived line for lks5.f, BW493, had awns that extended 3 to 4 cm beyond the tip of the spike, while those of Bowman were 12 to 13 cm beyond the tip. Kernels of BW493 were slightly shorter, narrower (3.4 vs. 3.9 mm), and lighter (4.6 vs. 5.5 mg). BW493 plants were slightly taller than Bowman, and grain yields were slightly reduced (4). Presence of the mutant allele lks5.p is needed for expression of the leafy lemma 1 (lel1.a) gene (4, 10).

A spontaneous mutant in an unknown cultivar (7).

lks5.f (GSHO 1297) in CIho 5641 (7, 13); lks5.g (Kmut 218) in Asahi 5 (OUJ509) (13); ari-c.2 (NGB 115847, GSHO 1651), -c.59 (NGB 115913) in Bonus (NGB 14657, PI 189763), -c.103 (NGB 115915) in Foma (NGB 14659, CIho 11333) (3); ari-c.106 (NGB 115918) in Foma (5); ari-c.109 (NGB 115921), -c.110 (NGB 115922), -c.111 (NGB 115923), -c.112 (NGB 115924), -c.120 (NGB 115932), -c.139 (NGB 115949), -c.157 (NGB 115967), -c.159 (NGB 115969), -c.179 (NGB 115989), -c.180 (NGB 115990), -c.199 (NGB 116008), -c.201 (NGB 116010), -c.203 (NGB 116012), -c.204 (NGB 116013), -c.206 (NGB 116014), -c.210a (NGB 116018), -c.210b (NGB 116019) -c.229 (NGB 116039) in Foma, -c.259 (NGB 116068), -c.262 (NGB 116071), -c.272 (NGB 116084), -c.276 (NGB 116089), -c.289 (NGB 116108), -c.291 (NGB 116111) in Kristina (NGB 14661, NGB 1500) (6); ari-c.307 (NGB 116135) in Kristina (8); two possible additional alleles have been reported, lks5.h (lk,,f) in two-rowed Glacier (3); and a mutant in Morex (CIho 15773) (12); lks5.p in G7118 (leafy lemma, GSHO 1780) mutant stock (1, 3, 4, 11).

lks5.f (GSHO 1297) in CIho 5641; ari-c.2 (NGB 115847, GSHO 1651) in Bonus; lks5.f in Bowman (PI 483237)*6 (GSHO 2014); lks5.f in Bowman*7 (BW493, NGB 20721); ari-c.2 in Bowman*7 (GSHO 2013, BW040, NGB 20448); lks5.p from G7118 in Bowman*4 with lel1.a (BW474, NGB 20704); lks5.p from G7118 in Bowman*5 (BW475, NGB 20705).

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