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Basidiospores of Puccinia striiformis f. sp. tritici succeed to infect barberry, while Urediniospores are blocked by non-host resistance.

Protoplasma 2017 November
Stripe rust (Yellow rust) caused by Puccinia striiformis f. sp. tritici (Pst) is a major disease of wheat worldwide. The use of resistant cultivars to control Pst has been very effective, low-cost, and ecologically sound. However, virulence patterns of Pst can quickly change, which may render resistant cultivars susceptible. The discovery of infection of Berberis spp. by basidiospores of Pst in 2010 raised important concerns about the evolution of new virulent races of the pathogen. Little is known about the infection process of Berberis spp. by basidiospores of Pst and the interaction between Berberis spp. and asexual urediniospores. In this study, the interaction between Pst urediniospores and Berberis spp. was investigated at histological and cytological levels. Our results indicate that Berberis spp. expresses a continuum of layered defenses comprised of structural and chemical changes in the cell wall as well as post-haustorial hypersensitive responses to urediniospore infection. Our study also re-examines in detail the infection process of Pst basidiospores on Berberis spp. and provides useful information for further research on the molecular mechanisms governing the interaction between Berberis spp. and Pst.

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