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CELL BIOLOGY & MOLECULAR GENETICS

Molecular Mapping of Russian Wheat Aphid Resistance from Triticale Accession PI 386156

^a Texas A&M Univ., Southern Crop Improvement Facility, College Station, TX 77843-2123 USA
^b Texas A&M Univ. Research and Extension Center, P.O. Box 1658, Vernon, TX 76384 USA

afritz{at}pop.tamu.edu

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 F₂ population between PI 386156, a Russian wheat aphid-resistant triticale (xTriticosecale 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.

Abbreviations: RWA, Russian wheat aphid • RAPD, random amplified polymorphic DNA • PCR, polymerase chain reaction • bp, base pairs

This article has been cited by other articles:

				A. J. Lukaszewski, D. R. Porter, C. A. Baker, K. Rybka, and B. Lapinski Attempts to Transfer Russian Wheat Aphid Resistance from a Rye Chromosome in Russian Triticales to Wheat Crop Sci., November 1, 2001; 41(6): 1743 - 1749. [Abstract] [Full Text] [PDF]