rust diseases
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2022 ◽  
Vol 8 (1) ◽  
pp. 83
Author(s):  
Rui Wang ◽  
Clement K. M. Tsui ◽  
Chongjuan You

Chrysomyxa rusts are fungal pathogens widely distributed in the Northern hemisphere, causing spruce needle and cone rust diseases, and they are responsible for significant economic losses in China. Taxonomic delimitation and precise species identification are difficult within this genus because some characters often overlap in several species. Adequate species delimitation, enhanced by the use of DNA-based methodologies, will help to establish well-supported species boundaries and enable the identification of cryptic species. Here, we explore the cryptic species diversity in the rust genus Chrysomyxa from China. Species delimitation analyses are conducted using a distance-based method (ABGD) and three tree-based methods (GMYC, bPTP, and mPTP) based on combined LSU and ITS sequences of over 60 specimens. Although there is some incongruence among species delimitation methods, two new species and three putative cryptic species are identified. The key to 20 Chrysomyxa species distributed in China is presented. These results suggest that a significant level of undiscovered cryptic diversity is likely to be found in Chrysomyxa from China. Future studies should consider multiple analytical methods when dealing with multi-locus datasets.


Author(s):  
R. S. Bhat ◽  
Venkatesh ◽  
M. P. Jadhav ◽  
P. V. Patil ◽  
K. Shirasawa

2021 ◽  
Vol 4 (1) ◽  
pp. 1-11
Author(s):  
Mesfin Tadele ◽  
Mussa Jarso ◽  
Sisay Argaye ◽  
Asnakech Tekalign ◽  
Nigat Tilahun ◽  
...  

Faba bean (Vicia faba L.) is a high value crop in Ethiopia and has versatile uses. The national faba bean breeding program concentrates on the three major traits (grain yield, disease resistance and seed size) of the crop for varietal release for commercial production. Hence, ten faba bean genotypes were evaluated at Adet, Areka, Bekoji, Haramaya, Holetta and Jimma during the main cropping seasons of 2018 and 2019 using a randomized complete block design with four replications with the objectives to select the genotype with best performance in terms of important agronomic traits like grain yield, disease resistance, large seed size and other desirable agronomic traits for high potential production areas in Ethiopia. The combined analysis of variance across locations revealed that there is highly significant (P < 0.01) variation among the tested genotypes for grain yield, 1000-seeds weight, number of pods per plant, and days to 90% physiological maturity. The genotype EH011089-3 showed better performance than the tested genotypes having comparable grain yield performance (3803 kgha-1) with the two standard checks, Numan and Gora (3790 and 3897 kgha-1, respectively) while it had the highest 1000-seeds weight (1065 g) compared to the two standard checks, Numan and Gora (937 g and 786 g, respectively), i.e., 13.7% and 35.5% advantage, over the two standard checks, respectively. Additionally, EH011089-3 had better resistance for chocolate spot and rust diseases. Therefore, EH011089-3 was the best over the tested varieties and breeding lines. Genotype EH011089-3 is recommended for varietal release for commercial production all over in Ethiopia.


2021 ◽  
Vol 51 (1) ◽  
Author(s):  
Ki Woo Kim

AbstractPuccinia miscanthi teliospores were observed on the leaf surface of Miscanthus sinensis using a field emission scanning electron microscope. Details of teliospore mucilage could be visualized through the axial imaging of secondary electrons for a better understanding of pathogen behavior in rust diseases.


2021 ◽  
pp. 873-920
Author(s):  
Sarrah Ben M’Barek ◽  
◽  
Seyed Mahmoud Tabib Ghaffary ◽  

This chapter reviews progress and challenges in breeding disease-resistant cereals in the West Asia and North Africa (WANA) region. It discusses challenges in ensuring durable resistance in the face of constantly-evolving pathogen threats. It includes case studies on progress in combatting rust diseases in Iran and combatting Septoria in North Africa.


2021 ◽  
pp. 15-38
Author(s):  
Vanessa Bueno-Sancho ◽  
◽  
Clare M. Lewis ◽  
Diane G. O. Saunders ◽  
◽  
...  

Rust fungi (order: Pucciniales) constitute the largest group of plant parasitic fungi and include many species of agricultural importance. This includes the three wheat rust fungi (Puccinia graminis f. sp. tritici, Puccinia striiformis f. sp. tritici and Puccinia triticina) that have posed a threat to crop production throughout history. This chapter provides an overview of the wheat rust pathogen lifecycle that has been critical to the design of effective disease management strategies and discusses recent integration of basic biological knowledge and genomic-led tools within an epidemiological framework. Furthermore, we include a case study on the “field pathogenomics” technique, illustrating the value of genomic-based tools in disease surveillance activities. Bringing together advances in understanding basic pathogen biology, developments in modelling for disease forecasting and identification, alongside genomic-led advances in surveillance and resistance gene cloning, holds great promise for curtailing the threat of these notorious pathogens.


Author(s):  
Anushree Pramanik ◽  
Sushma Tiwari ◽  
M.K. Tripathi ◽  
Sushmita Mandloi ◽  
R.S. Tomar

Background: Resistance to foliar fungal diseases along with oleic acid trait, are important objectives of groundnut breeding. Among foliar fungal diseases, rust and Late Leaf Spot (LLS) cause significant economic loss and high oleic trait is preferred in industry that enhances economic values of crop. Methods: Morphological characterization of the 186-groundnut germplasm lines/genotypes for ten yield attributing traits and their significance of correlation was analyzed using SPSS ver. 19 software at 1% and 5% probability level of significance. Screening for LLS and rust diseases was done employing 10X SNP assay at ICRISAT, Hyderabad, India. Selected superior groundnut germplasm line(s) were screened for presence of FAD2B allele responsible for high oleic acid traits using allele specific marker. Result: Significant and positive correlation was found between dry weight and hundred pod weight (r=0.0.801) and harvest index (r=0.0.830). Molecular characterization along with morphological characterization identified highly diversified lines of groundnut. This study reports 78 foliar fungal disease resistant groundnut germplasm lines. Selected 11 groundnut germplasm lines represented resistance against LLS and rust diseases along with FAD2B allele for oleic acid trait.


2021 ◽  
Vol 104 (2) ◽  
pp. 105-112
Author(s):  
O. A. Baranova* ◽  
S. N. Sibikeev ◽  
A. E. Druzhin ◽  
I. D. Sozina

Wheat is one of the most important food crops in Russia. Rust diseases (leaf, yellow and stem rusts) are particularly dangerous diseases of wheat that threaten food security. The stem rust (the causative agent is a biotrophic fungus Puccinia graminis f. sp. tritici) is the most damaging; crop losses can reach 50 to 80% and more. The paper presents the results of the analysis of resistance to stem rust of 189 introgressive lines of spring soft wheat breeding ARISER and 11 varieties cultivated in the Lower Volga region in the growing season 2016-2020. The results of phytopathological assessment of virulence of Saratov pathogen population 2016-2020 are also presented. It is shown that Sr13, Sr26, Sr31, Sr35 and combinations of Sr24+31, Sr36+31 and Sr26+9g genes are effective for Saratov populations of P. graminis 2016 - 2020. No isolates virulent to the line with the Sr31 gene have been identified in all years of research. Analysis of resistance in wheat varieties and lines showed a loss of Sr6Agi gene efficacy from 2016 and a gradual loss of Sr25 efficacy by 2020. In 2020, varieties carrying the Sr25 gene (Lebedushka and Dobrynya) and lines with this gene affected the Saratov population of stem rust, both under laboratory conditions and in the field on a natural infection background. In the analyzed 189 introgressed lines, Sr25/Lr19 (77.2%) and Sr31/Lr26 (22.2%) genes were mainly identified, Sr22, Sr35, Sr28, Sr38/Lr37 and Sr57/Lr34 genes were also identified. Fifty lines carrying the combination of Sr31 with Sr25/Lr19 and Sr6Agi have been identified as highly resistant to stem rust. Thus, it was shown that Sr31 gene was effective against P. graminis populations in Volga region, while Sr6Agi and Sr25 genes lost their effectiveness in Volga region.


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