Microsatellite mapping of the gene for sham ramification in spikelets derived from a hexaploid wheat (Triticum spp.) accession 171ACS
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Plants with elongated spikelet rachilla (sham ramification) have been found in the progenies of a cross between hexaploid wheat (Triticum aestivum L., 2n = 6x = 42, BBAADD genome) line ‘171ACS’ and durum wheat (T. durum Desf., 2n = 4x = 28, BBAA genome) ‘Bereketli-95’. 171ACS was the carrier of the genes for sham ramification and extra glume. Expression of both of these traits was suppressed in hexaploid wheat. The gene for “sham ramification” (shr 171ACS ) was mapped by genotyping F2 populations using microsatellite markers. In the F2 of 171ACS/Bereketli-95, the shr 171ACS gene was located in chromosome arm 5AL. The shr 171ACS gene and the gene for extra glume (exg) were completely linked. The shr 171ACS /exg gene complex was bracketed by the markers Xbarc319 and Xbarc232 on the long arm of chromosome 5A. In F2 hybrids between #145 and #629, and T. durum ‘LD222’, the shr 171ACS gene was completely linked to the exg gene, and the shr 171ACS /exg gene complex was located in the long arm of chromosome 5A. F2 hybrids between two tetraploid ramified progenies and T. jakubzineri Udacz. et Shakhm. (2n = 4x = 28, BBAA genome) indicated that shr 171ACS was allelic to shr1.
KeywordsExtra glume Genetic resource Sham ramification Triticum durum Desf. Triticumjakubzineri Udacz. et Schachm. Triticum turgidum L. Triticum vavilovii (Thum.) Jakubz.
We acknowledge the gift of seed of tetraploid wheat from the National Small Grain Collection (NGSC), Aberdeen, Idaho, USA. We thank Dr. D. L. Klindworth, USDA-ARS, Northern Crop Science Lab., Fargo, USA for helpful comments on our manuscript. PM thanks for support of the Ministry of Agriculture of the Czech Republic, Project No. QJ1310055.
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