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GrainGenes Reference Report: CRS-39-1707

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Reference	CRS-39-1707
Title	Molecular Mapping of Russian Wheat Aphid Resistance from Triticale Accession PI386156.
Journal	Crop Science
Year	1999
Volume	39
Pages	1707-1710
Author	Fritz AK Caldwell S Worrall WD
Abstract	The Russian wheat aphid (RWA), Diuraphis noxia Mordvilko, is an economic pest of wheat (Triticum aestivum L.) in some western growing regions. Sources of resistance occur within the wheat gene pool, but there are also high levels of resistance in wheat relatives, including rye (Secale cereale L.). An F(2) population between PI 386156, a Russian wheat aphid-resistant triticale (x Triticosecale Wittmack) from Russia and NE88T222, a susceptible triticale, was used to examine the inheritance of resistance. Five distinct classes of reaction to the RWA were observed, suggesting this trait is not controlled by a single dominant gene in this population. Bulked segregant analysis was performed with DNA from plants representing the most resistant ('R') and most susceptible ('S') classes. A co-dominant marker amplified by primer OP-M09 explained more than 55% of the variation observed for resistance. Sequencing results revealed a deletion in the 'S' parent relative to the 'R' parent. Using a set of wheat-rye addition lines, we mapped the target fragment to chromosome 4R, which has previously been identified as the critical chromosome for RWA resistance from PI 386156 and other Russian triticales
Keyword	[ Hide all but 1 of 35 ] addition lines aphid aphid resistance bulked segregant analysis chromosome codominant codominant marker deletion diuraphis noxia dna dominance gene gene interaction gene pool genetic mapping genetic resistance inheritance inheritance of resistance mapping marker molecular mapping pest resistance population relatives resistance resistant russian wheat aphid rye secale cereale susceptibility triticale triticum aestivum triticum x secale wheat aphid resistance x triticosecale

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