Efficacy of spot form of net blotch suppression in barley from seed, fertiliser and foliar applied fungicides

McLean, Mark S.; Poole, Nick; Santa, Isabel Munoz; Hollaway, Grant

doi:10.1016/j.cropro.2021.105865

Cited by 13 publications

(9 citation statements)

References 12 publications

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“…Net blotch (NB) disease reduces the quantitative (10%–44%) and qualitative (grain shrinkage) yield of barley (McLean et al, 2022; Wonneberger et al, 2017). The disease exists in two forms, spot form net blotch (SFNB) and net form net blotch (NFNB), caused by Pyrenophora teres f. maculata (Ptm) and P. teres f. teres (Ptt), respectively (Wonneberger et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Identification of novel and stable genomic regions associated with barley resistance to spot form net blotch disease under different temperature conditions during the reproductive stage

et al. 2023

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Spot form net blotch (SFNB) is one of the most important barley diseases in the world; abiotic stresses caused by climate change are also a problem for cultivation of cereals, including barley, on a global level. Identifying stable genomic regions associated with resistance to SFNB in different temperature conditions at the reproductive stage can accelerate the process of producing new cultivars resistant to this disease. In this study, 103 F 8 lines, resulting from the cross of cultivars Kavir and Badia, were cultivated in three years on three different dates. After artificial inoculation with Pyrenophora teres f. maculata Gonbad Kavous isolate, the plants were evaluated at the adult stage. The planting dates were chosen so that during early, conventional and delayed planting dates, the reproductive stage of the lines coincided with cold, nonthermal and heat stress conditions, respectively. A genome-wide composite interval mapping method was used to identify quantitative trait loci (QTLs) controlling SFNB and estimate the effect of each of them. In the cold, non-thermal and heat stress conditions at the reproductive stage, three (three major), four (two major) and six (one major) stable resistance QTLs against SFNB were detected, respectively. The stable QTLs of resistance including QRPtma-2H, QRPtma-3H and QRPtma-7H were located on chromosomes 2H, 3H and 7H, respectively. After flanking markers confirm the resistance of QTLs to SFNB, the SCoT7-C, ISJ17-B and Bmac0144k markers can be used in the screening resistance of cultivars under non-thermal and heat stress conditions. Moreover, the Bmac0282b and Ebmatc0016 markers can be used for screening resistance of cultivars under cold stress conditions in marker-assisted selection projects.

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Section: Introductionmentioning

confidence: 99%

Identification of novel and stable genomic regions associated with barley resistance to spot form net blotch disease under different temperature conditions during the reproductive stage

et al. 2023

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“…Currently, the mixture of the SDHI fungicide fluxapyroxad plus the azole fungicide triticonazole is one of the most used fungicides for barley seed treatment. This treatment has allowed obtaining successful results in the control of several seed‐borne pathogens of barley, such as Ptt , Rcc and Bipolaris sorokiniana 10,16 …”

Section: Introductionmentioning

confidence: 99%

“…4,5 Symptoms of the disease can manifest from the first phenological stages of barley crops. The disease can cause yield losses estimated at 20-40% on average, [6][7][8][9][10] and up to 100% in highly susceptible barley varieties. 11 Some of the most affected yield components are the number of grains per unit area and the weight of the grains.…”

Section: Introductionmentioning

confidence: 99%

“…Fungicides, applied as seed and foliar treatments, can preserve grain yield and quality of barley. 10 As the seed-borne inoculum results in a risk of economic yield loss to barley crops, the fungicide seed treatment should eradicate P. teres from the seed. Until 2012, the fungicides used in the treatment of barley seeds consisted mainly of azoles or their mixtures.…”

Section: Introductionmentioning

confidence: 99%

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SDHI resistance in Pyrenophora teres f teres and molecular detection of novel double mutations in sdh genes conferring high resistance

Sautua

Carmona

2023

Pest Management Science

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BACKGROUND: Net blotch (NB), caused by Pyrenophora teres f. teres (Ptt), is an important disease of barley worldwide. NB control is commonly achieved through the use of fungicide mixtures including strobilurins, triazoles and carboxamides. Succinate dehydrogenase inhibitors (SDHI) are important components of fungicide management programs of barley diseases. However, during the last growing seasons in Argentina, barley fields sprayed with mixtures containing SDHI fungicides have shown failures in NB control. Here, we report the isolation and characterization of Argentine Ptt strains resistant to SDHI fungicides.RESULTS: Compared against a sensitive (wild-type) reference strain collected in 2008, all 21 Ptt isolates collected in 2021 exhibited resistance to pydiflumetofen and fluxapyroxad both in vitro and in vivo. Concordantly, all of them presented target-site mutations in any of the sdhB, sdhC and sdhD genes. Although the mutations detected have been previously reported in other parts of the world, this study documents for the first time the occurrence of double mutations in the same Ptt isolate. Specifically, the double mutation sdhC-N75S + sdhD-D145G confers high resistance to SDHI fungicides, while the double mutations sdhB-H277Y + sdhC-N75S and sdhB-H277Y + sdhC-H134R confer moderate levels of resistance in Ptt.CONCLUSIONS: SDHI-resistance in Argentine Ptt populations is expected to increase. These findings emphasize the urgent need to perform a wider survey and a more frequent monitoring of SDHI sensitivity of Ptt populations and to develop and implement effective antiresistance tactics.

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“…2017 ). In Australia, SFNB is of economic importance, with yield losses of up to 20% and an increase of up to 18% in undersized grain ( McLean et al . 2022 ).…”

Section: Introductionmentioning

confidence: 99%

Widespread genetic heterogeneity and genotypic grouping associated with fungicide resistance among barley spot form net blotch isolates in Australia

Hassett

Muria-Gonzalez

Turner

et al. 2023

G3: Genes, Genomes, Genetics

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Spot form net blotch, caused by Pyrenophora teres f. maculata, is a major foliar disease of barley worldwide. Knowledge of the pathogen’s genetic diversity and population structure is critical for a better understanding of inherent evolutionary capacity and for the development of sustainable disease management strategies. Genome-wide, single nucleotide polymorphism data of 254 Australian isolates revealed genotypic diversity and an absence of population structure, either between states, or between fields and cultivars in different agro-ecological zones. This indicates there is little geographical isolation or cultivar directional selection and that the pathogen is highly mobile across the continent. However, two cryptic genotypic groups were found only in Western Australia, predominantly associated with genes involved in fungicide resistance. The findings in this study are discussed in the context of current cultivar resistance and the pathogen’s adaptive potential.

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Efficacy of spot form of net blotch suppression in barley from seed, fertiliser and foliar applied fungicides

Cited by 13 publications

References 12 publications

Identification of novel and stable genomic regions associated with barley resistance to spot form net blotch disease under different temperature conditions during the reproductive stage

Identification of novel and stable genomic regions associated with barley resistance to spot form net blotch disease under different temperature conditions during the reproductive stage

SDHI resistance in Pyrenophora teres f teres and molecular detection of novel double mutations in sdh genes conferring high resistance

Widespread genetic heterogeneity and genotypic grouping associated with fungicide resistance among barley spot form net blotch isolates in Australia

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