Wheat stripe rust (also known as yellow rust), caused by the basidiomycete fungus Puccinia striiformis Westend. f. sp. tritici Eriks. (PST), is one of the most devastating global diseases of wheat. Stripe rust disease is a historical and continuing threat to wheat production, capable of significantly reducing both grain quality and yield in susceptible wheat cultivars. The appearances of new and more aggressive PST races at the beginning of the 21st century, that rapidly spread throughout five continents, poses an increasing global threat to wheat production. In the UK, low genetic diversity in the host has lead to 60% of the wheat acreage being susceptible to a single dominant race of PST, encouraging excessive application of broad-spectrum fungicides. Therefore, determining the physiological and biochemical adaptations that underpin pathogenesis in PST is imperative to inform traditional plant breeding and uncover novel targets for developing PST-specific fungicides.
More information is available on wikipedia: Puccinia striiformis