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GrainGenes Gene Class Report: Branched spike

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Gene Class	Branched spike
Reference	Dobrovolskaya O et al. (2015) FRIZZY PANICLE Drives Supernumerary Spikelets in Bread Wheat Plant Physiology 167:189-199. Dobrovolskaya O et al. (2009) Microsatellite mapping of genes that determine supernumerary spikelets in wheat (T. aestivum) and rye (S. cereale). Theoretical and Applied Genetics 119:867-874. Peng ZS et al. (1998) Chromosomal location of genes for supernumerary spikelet in bread wheat. Euphytica 103:109-114.
LINK	Branched spike genes at Komugi: Catalog of Gene Symbols for Wheat
Character affected	Spike morphology
Gene	bh-A1 (Triticum) bh-D1 (Triticum) bh-R1 (Secale) brc1 (Hordeum)
Locus	mrs1(bh-D1) mo1(bh-R1) brc1
Comment	Wheat and rye spikes normally bear one spikelet per rachis node, and the formation of supernumerary spikelets (SS) is rare. The term SS includes sessile additional spikelets at a rachis node, additional spikelets on an extended rachilla, and the ramified spike (RS) seen in some tetraploid and hexaploid wheats. A synonym of RS is 'branched spike', while a strongly branched spike in rye is referred to as a 'monstrosum ear'. The loci responsible for the 'multirow spike' or MRS trait in wheat, and the 'monstrosum spike' trait in rye were mapped by genotyping F2 populations with microsatellite markers. Both MRS and the 'monstrosum' trait are under the control of a recessive allele at a single locus (Dobrovolskaya et al. 2009).
Data Curator	Cooper, Laurel Oct-2019

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