Expression of resistance to Ramularia leaf spot in winter barley cultivars grown in conditions of the Czech Republic

Mařík, P.; Šnejdar, Z.; Matušinsky, Pavel

doi:10.17221/34/2010-cjgpb

Cited by 11 publications

(3 citation statements)

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“…However, for RLS development a combination of abiotic factors as well as the host GS appear to be crucial [66,68]. In the Czech Republic, lower disease symptoms were observed when lower rainfall and higher temperatures occurred post heading (GS 59) [69]. Similar observations were made in Germany, where lower RLS severity was recorded in the warmer and drier years of 2017 and 2019 [70].…”

Section: Effect Of Host Heat Stress On Dothideomycete-induced Diseasesmentioning

confidence: 54%

Does Abiotic Host Stress Favour Dothideomycete-Induced Disease Development?

Röhrig

Dussart

2022

Plants

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Dothideomycetes represent one of the largest and diverse class of fungi. This class exhibits a wide diversity of lifestyles, including endophytic, saprophytic, pathogenic and parasitic organisms. Plant pathogenic fungi are particularly common within the Dothideomycetes and are primarily found within the orders of Pleosporales, Botryosphaeriales and Capnodiales. As many Dothideomycetes can infect crops used as staple foods around the world, such as rice, wheat, maize or banana, this class of fungi is highly relevant to food security. In the context of climate change, food security faces unprecedented pressure. The benefits of a more plant-based diet to both health and climate have long been established, therefore the demand for crop production is expected to increase. Further adding pressure on food security, both the prevalence of diseases caused by fungi and the yield losses associated with abiotic stresses on crops are forecast to increase in all climate change scenarios. Furthermore, abiotic stresses can greatly influence the outcome of the host-pathogen interaction. This review focuses on the impact of abiotic stresses on the host in the development of diseases caused by Dothideomycete fungi.

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Section: Effect Of Host Heat Stress On Dothideomycete-induced Diseasesmentioning

confidence: 54%

Does Abiotic Host Stress Favour Dothideomycete-Induced Disease Development?

Röhrig

Dussart

2022

Plants

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“…The interaction between the fungus and host plant is now elucidated at the molecular level (Lemcke et al, 2021;Sjokvist et al, 2019). Marik et al (2011) found that stronger symptomatic expression was positively affected by a higher number of rainy days in the three weeks post-flowering. These authors also reported that higher temperatures and lower rainfall post-flowering reduced disease levels in the Czech Republic.…”

Section: Introductionmentioning

confidence: 99%

Spore dispersal patterns of the ascomycete fungus Ramularia collo-cygni and their influence on disease epidemics

et al. 2023

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Ramularia leaf spot is a major economic disease of barley caused by the dothidiomycete fungus Ramularia collo-cygni. The fungus has a complex life cycle which includes extensive late season spore release events and a seed-borne phase. Predicting disease epidemics during the growing season remains a difficult challenge. To better understand the interaction between spore movement and disease epidemics, spore samplers were set up in Germany (2 sites over 4 years), Poland (7 sites over 2 years) and the UK (2 sites over 9 years), where the disease has been observed. Spore concentrations were determined using a real-time PCR assay, and meteorological data were obtained from co-located automatic stations. Spore release events were seen to peak in June on mainland Europe and July in the UK. The pattern of spore release was broadly similar across countries with earlier peaks in mainland Europe. A relationship was observed in the UK between July spore levels and disease in following winter barley crops. Rainfall and temperature were proposed as significant drivers of spore release in these months. The major environmental parameter associated with spore release across the two UK sites was crop surface wetness, although some site-specific interactions were noted for rainfall and wind movement. Regression analysis of spore patterns and disease epidemics indicates a relationship between spore levels 75 and 105 days pre-harvest and final disease levels in UK winter barley crops. This relationship was not observed in spring barley. The implications on risk forecasts are discussed.

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“…While this study confirms the presence of R. collo-cygni in Australia, assessment of samples from a small number of fields limited the ability to describe the incidence and distribution across barley growing regions. The bioRxiv distribution of R. collo-cygni in Australia may be affected by environmental conditions, as RLS is reported to be more severe in cool, wet environments(Dussart et al 2020;Hoheneder et al 2021b;Mařík et al 2011;McGrann and Brown 2018) compared to drier conditions, however distinct disease responses to environmental factors require further investigation.…”

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confidence: 99%

Detection ofRamularia collo-cygnifrom barley (Hordeum vulgare) in Australia using triplex quantitative and digital PCR

Knight

Moslemi

Begum

et al. 2021

Preprint

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Ramularia leaf spot (RLS), caused by Ramularia collo-cygni, is an emerging threat to barley (Hordeum vulgare) production. RLS has been reported in Australia; however only minimal information is available regarding its detection and distribution. Due to initial asymptomatic growth in planta, slow growth in vitro and symptomatic similarities to net blotch and physiological leaf spots, detection of this pathogen can be challenging. Quantitative PCR-based methods for R. collo-cygni-specific identification and detection have been described, however these assays (based upon the internal transcribed spacer [ITS] region) have been demonstrated to lack specificity. False-positive detections may have serious implications, thus we aimed to design a robust R. collo-cygni-specific PCR method. Using the phylogenetically informative RNA polymerase II second largest subunit (rpb2) and translation elongation factor 1-α (tef1-α) genes, along with the tef1-α gene of H. vulgare, a triplex assay was developed for both quantitative and digital PCR. The triplex assay was used to assess DNA of barley leaves from New South Wales, South Australia, Tasmania, Victoria and Western Australia, along with DNA of seeds from Western Australia. Detection of R. collo-cygni DNA was confirmed for leaf samples from New South Wales, South Australia, Tasmania, Victoria and Western Australia, indicating a distribution ranging across the southern barley growing regions of Australia. No R. collo-cygni DNA was detected in seed from Western Australia. The R. collo-cygni-specific assay will be a valuable tool to assist with monitoring the distribution of R. collo-cygni in Australia and other regions.

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Expression of resistance to Ramularia leaf spot in winter barley cultivars grown in conditions of the Czech Republic

Cited by 11 publications

References 1 publication

Does Abiotic Host Stress Favour Dothideomycete-Induced Disease Development?

Does Abiotic Host Stress Favour Dothideomycete-Induced Disease Development?

Spore dispersal patterns of the ascomycete fungus Ramularia collo-cygni and their influence on disease epidemics

Detection ofRamularia collo-cygnifrom barley (Hordeum vulgare) in Australia using triplex quantitative and digital PCR

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