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GrainGenes Reference Report: CRS-40-1406

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Reference	CRS-40-1406
Title	Genetic analysis of pre-harvest sprouting resistance in a wheat x spelt cross
Journal	Crop Science
Year	2000
Volume	40
Pages	1406-1417
Author	Zanetti S Winzeler M Keller M Keller B Messmer M
Abstract	Summary: Breeding for pre-harvest sprouting (PHS) resistance in wheat (Triticum aestivum L.) and spelt (Triticum spelta L.) is difficult because PHS is quantitatively inherited and strongly affected by environmental factors. The aim of this study was to detect molecular markers linked to quantitative trait loci (QTL) involved in PHS resistance to improve the breeding process. We measured falling number (FN) and alpha-amylase activity (AA) of 226 F5 recombinant inbred lines (RILs) originating from a cross between the Swiss wheat cultivar Forno and the Swiss spelt cultivar Oberkulmer in four environments. QTL analysis was performed with 204 RILs and based on a genetic map of 183 loci. Across environments, 12 and 13 QTL were detected for FN and AA, respectively. Altogether the QTL explained more than 75% of the phenotypic variance. The two traits were highly correlated (r = -0.91) and of the 13 QTL for AA, nine coincided with QTL for FN. Three of the six QTL with major effects (R2 greater than or equal to 15%) on PHS resistance coincided with QTL for ear length. The QTL with the strongest impact had the positive allele from Oberkulmer and was located on 5AL at the q locus, which is responsible for the typical ear morphology of spelt. The QTL on 6A (with the positive allele from Forno), 3B, and 7B (both with the positive allele from Oberkulmer) improve PHS resistance without changing the ear morphology. Thus, these QTL could be important for marker assisted selection for PHS resistance in both the wheat and the spelt germplasm
Keyword	[ Hide all but 1 of 48 ] aa alpha amylase alpha amylase activity alpha-amylase activity assisted selection barley cross breeding cross damage ear environment environmental factors genetic genetic analysis genetic map genetic markers germplasm inbred lines interspecific hybridization linkage loci locus map marker marker assisted selection molecular marker morphology ph pre-harvest sprouting qtl qtl analysis quality quantitative trait quantitative trait loci quantitative traits r2 recombinant inbred lines resistance selection spelt spelta sprouting switzerland triticum aestivum triticum spelta variance water-uptake wheat cultivar

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