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CELL BIOLOGY & MOLECULAR GENETICS

Mapping Yr28 and Other Genes for Resistance to Stripe Rust in Wheat

^a Wheat Program, International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, 06600 Mexico, D. F., Mexico
^b 49 Lionel Rd., Darlington WA 6070, Australia
^c Dep. of Plant Breeding and Biometry, 252 Emerson Hall, Cornell Univ., Ithaca, NY 14853, USA

jcnelson{at}global.net.au

Stripe (yellow) rust, caused by Puccinia striiformis West., is an important constraint to wheat production in cool environments. With the purpose of identifying genes for resistance to the disease, a RFLP mapping population of recombinant inbred lines developed from a synthetic [Triticum turgidum L. x Aegilops tauschii (Coss.) Schmal.] x T. aestivum L. cv. `Opata 85' cross was visually evaluated for seedling infection type in three greenhouse inoculation tests and for adult-plant disease severity in four field tests at Celaya and Toluca, Mexico. A previously unidentified gene from Ae. tauschii, designated as Yr28, was located on chromosome arm 4DS. Although Yr28 strongly influenced seedling resistance, it showed a strong effect in adult plants at only the warmer of the two field sites. A second gene showed high environmental sensitivity in seedling tests, with resistance associated with Opata marker alleles near the adult-plant resistance (APR) gene Yr18 on chromosome arm 7DS. Gene Yr18, known to be present in Opata, strongly reduced disease response in field trials and was tightly linked with leaf-rust resistance gene Lr34. Three other regions from Opata on chromosome arms 3BS, 3DS, and 5DS were also associated with APR.

Abbreviations: APR, adult-plant resistance • At, Aegilops taushii • IT, infection type • RFLP, restriction fragment length polymorphism • RIL, recombinant inbred line • YR, yellow or stripe rust

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