International Database for Barley Genes and Barley Genetic Stocks
BGS 647, Tip sterile 1, tst1
Stock number: BGS 647
Locus name: Tip sterile 1
Locus symbol: tst1
Previous nomenclature and gene symbolization:
Monofactorial recessive (2, 3).
Located in chromosome 6HL (likely) (1); tst1.c is associated with a large segment of SNP markers 1_0882 to 2_0531 (positions 70.15 to 160.38 cM) in 6H bins 05 to 09, and with smaller group of SNP markers in 7HL, of the Bowman backcross-derived line BW882 (1).
Mutant plants and spikes appear normal except there is no seed set in the tip of the spike (3). In the Bowman backcross-derived line under greenhouse conditions, seed set is 40 to 60% with no fertile spikelets at the terminal 4 to 6 nodes of the rachis. The tst1.c mutant differs from lin1 (lesser internode number 1) (BGS 99) and tst2 (BGS 636) plants because lin1 is not associated with tip sterility and tst2 produces more sterility and reduces height and vigor (2). Under field conditions, the number of kernels per spike for the tst1.c mutant in the Bowman backcross-derived line, BW882, varied from 30% less to near normal. Kernels of BW882 were 10 to 15% wider than those of Bowman and weighed 10 to 15% more. Grain yields of BW882 were about 2/3 those of Bowman. Other morphological traits of BW882 were similar to those of Bowman (2).
Origin of mutant:
A fast neutron induced mutant in Steptoe (CIho 15229) (3).
tst1.c (FN43, GSHO 3644) in Steptoe (CIho 15229) (3).
Mutant used for description and seed stocks:
tst1.c (FN43, GSHO 3644) in Steptoe; tst1.c in Bowman (PI 483237)*4 (BW882, NGB 22316).
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 Franckowiak, J.D. (Unpublished).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 Kleinhofs, A. (Unpublished).
A. Kleinhofs and J.D. Franckowiak. 2005. Barley Genet. Newsl. 35:205.
J.D. Franckowiak and A. Kleinhofs. 2013. Barley Genet. Newsl. 43:170.