Recent molecular technologies for tackling wheat diseases

2017 ◽  
pp. 385-416 ◽  
Author(s):  
Indu Sharma ◽  
◽  
Pramod Prasad ◽  
Subhash C. Bhardwaj ◽  
◽  
...  
Keyword(s):  
Wheat Diseases

Wheat Diseases and Pests

2010 ◽  
Vol 159 (4) ◽  
pp. 324-324 ◽  
Author(s):  
Rudolf Heitefuss
Keyword(s):  
Wheat Diseases

scholarly journals Direct and indirect losses determining the harmfulness of mushrooms p. Fusarium – fusariosis causes wheat speak and grain

2020 ◽  
Vol 58 (1) ◽  
pp. 55-67
Author(s):  
Yu. K. Shashko ◽  
A. L. Dolgova ◽  
M. N. Shashko
Keyword(s):  
Crop Yield ◽  
Negative Impact ◽  
Protective Measures ◽  
Wheat Diseases ◽  
Yield And Quality ◽  
Grain Damage ◽  
Fusarium Pathogens ◽  
Flour Yield ◽  
Indirect Losses

Fungi p. Fusarium is one of the most harmful pathogens of wheat diseases. Their harmfulness is caused both by direct losses due to decrease in yield, and indirect as a result of infection of the obtained products with mycotoxins and decrease in process, baking and sowing parameters of grain. Due to high potential losses, analysis of quantitative parameters of harmfulness of fusarium pathogens of spike and grain is relevant. The paper presents data showing the harmfulness of Fusarium of spike and wheat grain. The causes of direct and indirect losses in case of damage to wheat spike by fungi of p. Fusarium. Direct losses of crop yield are shown in the natural conditions of Minsk region and with the epiphytotic development of the disease in case of artificial infection, which can reach over 50 %. The effect of Fusaria on baking properties of wheat is analyzed. It was determined that grain damage causes decrease in weight of 1000 grains and the flour yield when it is used in the milling industry, as well as deterioration in its quality due to decrease in protein and crude gluten level. The effect of pathogens on sowing parameters of grain is determined. It is concluded that for use as seeds in terms of laboratory germination capacity, batches of grain infected with Fusarium only up to 15 % can be accepted. The data obtained will allow us to adapt protective measures against Fusarium of spike and grain and reduce its negative impact on crop yield and quality of the products obtained.

scholarly journals Volatile Organic Compound Profiles From Wheat Diseases Are Pathogen-Specific and Can Be Exploited for Disease Classification

2022 ◽  
Vol 12 ◽  
Author(s):  
Andrea Ficke ◽  
Belachew Asalf ◽  
Hans Ragnar Norli
Keyword(s):  
Pure Culture ◽  
Fusarium Culmorum ◽  
Fungal Species ◽  
Plant Diseases ◽  
Disease Classification ◽  
Diagnostic Tools ◽  
Head Blight ◽  
Wheat Varieties ◽  
Wheat Diseases ◽  
Volatile Organic

Plants and fungi emit volatile organic compounds (VOCs) that are either constitutively produced or are produced in response to changes in their physico-chemical status. We hypothesized that these chemical signals could be utilized as diagnostic tools for plant diseases. VOCs from several common wheat pathogens in pure culture (Fusarium graminearum, Fusarium culmorum, Fusarium avenaceum, Fusarium poae, and Parastagonospora nodorum) were collected and compared among isolates of the same fungus, between pathogens from different species, and between pathogens causing different disease groups [Fusarium head blight (FHB) and Septoria nodorum blotch (SNB)]. In addition, we inoculated two wheat varieties with either F. graminearum or P. nodorum, while one variety was also inoculated with Blumeria graminis f.sp. tritici (powdery mildew, PM). VOCs were collected 7, 14, and 21 days after inoculation. Each fungal species in pure culture emitted a different VOC blend, and each isolate could be classified into its respective disease group based on VOCs with an accuracy of 71.4 and 84.2% for FHB and SNB, respectively. When all collection times were combined, the classification of the tested diseases was correct in 84 and 86% of all cases evaluated. Germacrene D and sativene, which were associated with FHB infection, and mellein and heptadecanone, which were associated with SNB infection, were consistently emitted by both wheat varieties. Wheat plants infected with PM emitted significant amounts of 1-octen-3-ol and 3,5,5-trimethyl-2-hexene. Our study suggests that VOC blends could be used to classify wheat diseases. This is the first step toward a real-time disease detection in the field based on chemical signatures of wheat diseases.

scholarly journals Understanding Interactions Histological, Cytological, and Molecular Among the fungus P. Striiformis Tritici and Wheat

2021 ◽  
Author(s):  
Valeria Moreno Heredia
Keyword(s):  
Virulence Genes ◽  
Puccinia Striiformis ◽  
Early Stage ◽  
Yellow Rust ◽  
Complete Understanding ◽  
Rust Disease ◽  
Resistant Cultivars ◽  
Wheat Diseases ◽  
Migratory Capacity ◽  
Palabras Clave

Yellow rust is caused by the fungus Puccinia striiformis f.sp.tritici (Pst), which due to its great migratory capacity, adaptation to different environments, and high levels of mutation; is one of the most devastating wheat diseases worldwide. Due to this, several strategies have been implemented to control the disease, the best being genetic improvement. The key to develop resistant cultivars is understanding the interactions between wheat and Pst. Therefore, this work synthesizes the most important investigations carried out in the last 30 years regarding: cellular, histological, and molecular interactions between wheat and Pst. This will allow a deeper and more complete understanding of the interaction between resistance and virulence genes in the yellow rust disease. The results of this work revealed that the early stage of infection, in susceptible and resistant cultivars, is the same qualitatively, but not quantitatively. However, a clear difference at the histological and molecular level, in terms of the amount and type of genes expressed, begins 48 hours after infection. It was also found that the haustorium, in addition to absorbing nutrients from the host; can also manipulate its metabolism to benefit itself, and can make some nutrients on its own. Keywords: haustorio, Puccinia striiformis f.sp.tritici, histological, resistance genes, virulence genes. Resumen La roya amarilla es causada por el hongo Puccinia striiformis f.sp.tritici (Pst), el cual debido a su gran capacidad migratoria, adaptación a diferentes ambientes, y niveles altos de mutación; es la enfermedad más devastadoras del trigo a nivel mundial. Debido a esto, varias estrategias han sido implementadas para controlar la enfermedad, siendo la mejor, el mejoramiento genético. La clave para desarrollar cultivares resistentes, es el entendimiento de las interacciones entre el trigo y Pst. Por lo tanto, este trabajo sintetiza las investigaciones más importantes realizadas en los últimos 30 años, en cuanto a interacciones celulares, histológicas y moleculares entre el trigo y Pst. Esto permitirá un entendimiento más profundo y completo de la interacción entre los genes de resistencia y virulencia, en la enfermedad de la roya. Los resultados revelaron que la fase temprana de infección en cultivares susceptibles y resistentes, es igual cualitativamente, pero no cuantitativamente. Sin embargo, una diferencia clara a nivel histológico y molecular, en cuanto a la cantidad y al tipo de genes expresados, empieza 48 hr post infección. También, se halló que el haustorio además de absorber nutrientes del huésped, también manipula el metabolismo de éste para su beneficio y puede elaborar algunos nutrientes por sí mismo. Palabras Clave: haustorio, Puccinia striiformis f.sp.tritici, histológico, genes de resistencia, genes de virulencia.

scholarly journals First Report of Leaf Rust by Puccinia triticina on Wheat in Oman

Plant Disease ◽  
2007 ◽  
Vol 91 (1) ◽  
pp. 113-113 ◽  
Author(s):  
M. L. Deadman ◽  
A. Al Sa'di ◽  
Y. Al Maqbali ◽  
M. C. Aime
Keyword(s):  
Dna Analysis ◽  
Large Subunit ◽  
Puccinia Triticina ◽  
Triticum Aestivum L ◽  
Internal Transcribed Spacer Region ◽  
American Phytopathological Society ◽  
Wheat Diseases ◽  
Light Yellow ◽  
Voucher Specimens ◽  
Survival Mechanisms

Wheat (Triticum aestivum L.), cultivated for forage and grain production, is an important crop in the Sultanate of Oman. In April 2005, leaf samples of an unknown local variety showing rust symptoms were collected from Rustaq, 100 km southwest of Muscat. Circular-to-oval, red-brown pustules, typical of uredinia, occurred mostly on the upper surface of leaves on plants nearing maturity. Telia with teliospores were observed on leaf sheaths. The disease was widespread in many fields and was likely to be limiting the yield. Urediniospores typical of Puccinia triticina Erikss. (=P. recondita Rob. ex Desm. f. sp. tritici) were roughly subglobose, measuring 18 to 28 × 20 to 25 μm, echinulate, with 3 to 8 scattered germ pores; teliospores were 2-celled, 34 to 50 × 15 to 17 μm, apex is chestnut brown, lower cell is light yellow, no germ pores (1,2). Pathogen identity was confirmed by nuclear ribosomal large subunit and internal transcribed spacer region-2 DNA analysis (voucher sequence deposited in GenBank, Accession No. DQ664194, voucher specimens deposited in the U.S. National Fungus Collections, BPI 872158 and 872159). Wheat is grown during the winter months in Oman and harvested in May. Although the disease was observed again in 2006, pathogen survival mechanisms are not presently clear, and current research is attempting to confirm its presence on alternate hosts, including grass weeds, and determine the distribution of the pathogen on local wheat land races and imported varieties. To our knowledge, this is the first documented report of P. triticina on wheat in Oman. Reference: (1) D. B. O. Savile. Fungi Can. 309:1, 1986. (2) M V Wiese. Compendium of Wheat Diseases. The American Phytopathological Society, St Paul, MN, 1987.

Wheat diseases: an overview

2017 ◽  
pp. 263-294 ◽  
Author(s):  
Albrecht Serfling ◽  
◽  
Doris Kopahnke ◽  
Antje Habekuss ◽  
Fluturë Novakazi ◽  
...  
Keyword(s):  
Wheat Diseases

scholarly journals Latent Infection of Powdery Mildew on Volunteer Wheat in Sichuan Province, China

Plant Disease ◽  
2019 ◽  
Vol 103 (6) ◽  
pp. 1084-1091
Author(s):  
Na Liu ◽  
Yu Lei ◽  
Min Zhang ◽  
Wenming Zheng ◽  
Yongchun Shi ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Real Time ◽  
Real Time Pcr ◽  
Primary Infection ◽  
Latent Infection ◽  
Critical Role ◽  
Sichuan Province ◽  
Wheat Seedlings ◽  
Wheat Diseases ◽  
Infection Source

Wheat powdery mildew, caused by the fungal pathogen Blumeria graminis f. sp. tritici, is one of the most destructive wheat diseases in China, especially in Sichuan Province. Successfully oversummered B. graminis f. sp. tritici can become a primary infection source for wheat seedlings in the fall. Determining the latent infection level of B. graminis f. sp. tritici in volunteer wheat and the oversummering areas of B. graminis f. sp. tritici is important for estimating potential B. graminis f. sp. tritici epidemics. In this study, we clarified the critical role of volunteer wheat in the B. graminis f. sp. tritici oversummering cycle and determined whether latent B. graminis f. sp. tritici infection was present in volunteer wheat by using real-time polymerase chain reaction (real-time PCR). The results indicated that volunteer wheat was mostly found in the northeast and middle regions of Sichuan, where lower temperatures and higher precipitation are common. A total of 13.2% of samples showed symptoms of B. graminis f. sp. tritici (spores) in the field, and 36.8% of samples were found to carry the B. graminis f. sp. tritici pathogen, even though no symptoms were observed. Volunteer wheat with B. graminis f. sp. tritici infection symptoms was found at an altitude of 536 m but volunteer wheat latently infected by B. graminis f. sp. tritici was identified at the lowest altitude of 323 m. Crop shade (e.g., corn and lima bean) provided suitable conditions for the survival of volunteer wheat in the summer. In addition, volunteer wheat played a key role in the B. graminis f. sp. tritici oversummering cycle. Moreover, B. graminis f. sp. tritici could oversummer by infecting generations of volunteer wheat in the summer, thereby becoming the primary infection source for autumn-sown wheat. The results showed that the latent infection of wheat diseases could be rapidly quantified by real-time PCR. Here, the primary disease center of autumn-sown wheat in Ya’an and Wenjiang were detected accurately based on this method. This study provides solid evidence for identifying the disease center, which offers guidance for wheat disease control and management.

Comparison of the effectiveness of standard and drift-reducing nozzles for control of some winter wheat diseases

2008 ◽  
Vol 115 (1) ◽  
pp. 23-31 ◽  
Author(s):  
S. Vajs ◽  
G. Leskošek ◽  
A. Simončič ◽  
M. Lešnik
Keyword(s):  
Winter Wheat ◽  
Wheat Diseases
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