Global status of wheat leaf rust caused by Puccinia triticina

Abstract

Leaf rust caused by Puccinia triticina is the most common and widely distributed of the three wheat rusts. Losses from leaf rust are usually less damaging than those from stem rust and stripe rust, but leaf rust causes greater annual losses due to its more frequent and widespread occurrence. Yield losses from leaf rust are mostly due to reductions in kernel weight. Many laboratories worldwide conduct leaf rust surveys and virulence analyses. Most currently important races (pathotypes) have either evolved through mutations in existing populations or migrated from other, often unknown, areas. Several leaf rust resistance genes are cataloged, and high levels of slow rusting adult plant resistance are available in high yielding CIMMYT wheats. This paper summarizes the importance of leaf rust in the main wheat production areas as reflected by yield losses, the complexity of virulence variation in pathogen populations, the role cultivars with racespecific resistance play in pathogen evolution, and the control measures currently practiced in various regions of the world.

Screening For Resistance Against Rust Diseases In Advanced Wheat (Triticum Aestivum L.) Genotypes

“…tritici (pgt) contributes great losses to wheat produce. 2,5,21,22 Here we report our findings for disease intensity (leaf, stem and yellow rusts) on wheat genotypes at various locations (Tables 3-6). Genotypes showed distinct response to different rusts (leaf, yellow and stem rust).…”

“…Leaf rust can cause heavy losses of up to 50% especially in a susceptible genotype because of its more frequent and widespread occurrence, its effect on total annual losses is more severe than other rusts (stem and stripe) worldwide. 5 For stem rust, all five contesting advance lines showed low intensity of disease over all 3 locations with ACI values 0.0, 0.2, 0.67, 0.13, and 5.0, respectively (Table 5). Stem rust at Tandojam site did not appear, however it was observed at Karachi and Thatta sites.…”

“…4 Due to the rapidly evolving nature of Ug99 several resistance genes originally described as effective are no longer functional. 5 Over 5000 or more species of rust fungi have been reported. 3 Wheat (Triticum aestivum L.) is one of the leading food source of Pakistan, while providing 30 percent dry matter and 60 percent calorie intake to the population of developing regions of the world.…”

“…14 Although presently 58 stem rust resistance (Sr) loci have been recognized in wheat, 5 just few were found functional particularly against the highly virulent Ug99 15 and new variants. [16][17][18] Markers based approaches are reliable to locate genes regulating the disease reaction.…”

QTL mapping for adult-plant leaf rust resistance genes in Chinese wheat cultivar Weimai 8

“…Leaf rust occurs in wheat growing areas all over the world. In China, the southwest and the northwest are the two most vulnerable regions where it causes serious yield losses (Huerta-Espion et al 2011). Selection and deployment of resistant cultivars is the most economic and effective measure used for the wheat leaf rust control.…”