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  • Author or Editor: M. Tar x
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Growing resistant wheat cultivars is considered to be an efficient and environmentally safe approach in reducing damage caused by leaf rust disease. Among the numerous leaf rust resistance genes of wheat, Lr52 is a very effective one with a broad spectrum resistance. The objective of this study was to identify and map molecular markers closely linked to the Lr52 resistance gene. Out of 280 RAPD, 44 SSR and 8 STS markers tested, three showed close linkage to the Lr52 . In our study, one SSR marker (Xwmc149) showed a close linkage (11.3 cM) to the Lr52 gene. Another SSR (Xgwm234) and an STS (Xtxw200) markers, having close linkage to a recently identified leaf rust resistance gene found in PI 289824, also showed a close linkage (7.2 and 3.6 cM, respectively) to the Lr52 . Matchings in the mapping distances of these markers linked to these resistance genes still remain open the possibility that the gene found in PI 289824 is identical to the Lr52 , or simply this locate very close to it.

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Authors: D. Huang, H. Zhang, M. Tar, Y. Zhang, F. Ni, J. Ren, D. Fu, L. Purnhauser and J. Wu

Stripe or yellow rust (Yr), caused by Puccinia striiformis Westend. (Pst), is one of the most important wheat diseases worldwide. New aggressive Pst races can spread quickly, even between countries and continents. To identify and exploit stripe rust resistance genes, breeders must characterize first the Pst resistance and genotypes of their cultivars. To find new sources of resistances it is important to study how wheat varieties respond to Pst races that predominate in other continents. In this study we evaluated stripe rust resistance in 53 Hungarian winter wheat cultivars in China. Twenty-four cultivars (45.3%) had all stage resistance (ASR) and 1 (1.9%) had adult-plant resistance (APR), based on seedling tests in growth chambers and adult-plant tests in fields. We molecularly genotyped six Yr resistance genes: Yr5, Yr10, Yr15, Yr17, Yr18, and Yr36. Yr18, an APR gene, was present alone in five cultivars, and in ‘GK Kapos’, that also had seedling resistance. The other five Yr genes were absent in all cultivars tested.

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