First report of Exserohilum leaf spot: a unique halophilic pathogen in Cucumis sativus in the South Bengal area of India

Dhara, Bikram; Maity, Amrita; Mondal, Poushali; Mitra, Arup Kumar

doi:10.1007/s13313-020-00705-9

Cited by 7 publications

(3 citation statements)

References 28 publications

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“…Morphological characterization has played an important role in characterizing and identifying the isolates in this study. Based on the mycelial growth rate and development pattern, isolates were initially categorized into 2 categories: group I consisted of B. sorokiniana isolates with relatively slow growth rate, seldom covering the entire plate ( Aggarwal et al, 2009 ) and group II consisted of B. spicifera , B. oryzae , and E. rostratum isolates with faster growth rates ( Biswas and Das, 2018 ; Dhara et al, 2020 ; Devi et al, 2021 ) ( Figure 2 ). Later, based on spore morphology and sporulation studies, group I isolates were identified as B. sorokiniana isolates with olive green to brown oblong conidia with prominent scar at the base, having dimensions in the range of 60–120 μm × 15–20 μm and 3–9 septa ( Aggarwal et al, 2009 ; Acharya et al, 2011 ; Devi et al, 2021 ).…”

Section: Discussionmentioning

confidence: 99%

“…Later, based on spore morphology and sporulation studies, group I isolates were identified as B. sorokiniana isolates with olive green to brown oblong conidia with prominent scar at the base, having dimensions in the range of 60–120 μm × 15–20 μm and 3–9 septa ( Aggarwal et al, 2009 ; Acharya et al, 2011 ; Devi et al, 2021 ). Group II isolates were further subdivided into 2 groups: i) B. spicifera isolates which were substantially smaller, had less septation, and were considerably different from B. sorokiniana spores ( Kumar et al, 2002 ; Kachkouch et al, 2011 ; Qostal et al, 2019 ); and ii) E. rostratum isolates with long, thin spores with thick, dark-colored septa at both ends and were very different from the other 2 groups ( Ahmadpour et al, 2013 ; Bunkoed et al, 2014 ; Sharma et al, 2014 ; Hernández-Restrepo et al, 2018 ; Dhara et al, 2020 ). Further, molecular identification with ITS and GAPDH region sequencing revealed the presence of another pathogenic group, i.e.…”

Section: Discussionmentioning

confidence: 99%

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Unraveling the dynamics of wheat leaf blight complex: isolation, characterization, and insights into pathogen population under Indian conditions

Aditya,

Aggarwal,

Bashyal

et al. 2024

Front. Microbiol.

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Wheat, a staple food crop for 35% of the global population, faces a threat from Helminthosporium leaf blight (HLB), a complex of spot blotch (Bipolaris sorokiniana) and tan spot (Pyrenophora-tritici-repentis) diseases under warm and humid conditions. However, in Indian conditions, the knowledge of existing pathogen populations associated with the HLB complex is limited and largely dominated by only B. sorokiniana (spot blotch). To address this, diseased samples were collected from all six wheat growing zones during 2020–2022. The pathogenic species were identified through in-depth morphological characterization, supplemented with ITS-rDNA and GAPDH sequence analysis, a diagnostic SCAR marker, and pathogenicity studies on two wheat varieties: Sonalika and HD2733. The 32 isolates collected from 10 different states consist of B. spicifera (12.5% of all isolates), Exserohilum rostratum (9.3%), Bipolaris oryzae (3.1%), and B. sorokiniana (75%). B. sorokiniana exhibited the highest disease severity on both varieties. Other lesser-known pathogenic species also produced comparable disease severity as B. sorokiniana isolates and, therefore are economically important. Unraveling pathogen composition and biology aids in disease control and resistance breeding. Our study highlights economically impactful and lesser-known pathogenic species causing wheat leaf blight/spot blotch in India, guiding both current management and future resistance breeding strategies in plant pathology.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Unraveling the dynamics of wheat leaf blight complex: isolation, characterization, and insights into pathogen population under Indian conditions

Aditya,

Aggarwal,

Bashyal

et al. 2024

Front. Microbiol.

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“…Through this visual representation, we could clearly illustrate the evolutionary distances and complex genetic relationships among the studied Curvularia sp. isolates, offering stakeholders a comprehensive and detailed perspective on their genetic heritage ( Dhara et al, 2020 ).…”

Section: Methodsmentioning

confidence: 99%

Unveiling Curvularia tuberculata-induced leaf anomalies in Rhododendron ferrugineum: implications in cultural-ecological conservation and harnessing microbial intervention in socio-economic advancement

Dhar,

Hazra,

Patra

et al. 2024

Front. Microbiol.

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IntroductionThe research focuses on Rhododendron ferrugineum L., Nepal’s national flower and Uttarakhand’s state tree, thriving in high-altitude mountain ecosystems.Methodology and ResultA study conducted in Himachal Pradesh (Latitude: N 31° 6’ 2.0088”, Longitude: E 77° 10’ 29.9136”) identified leaf anomalies resembling rust-like manifestations in R. ferrugineum. These anomalies were traced back to the pathogenic fungus Curvularia tuberculata, marking the first documented case of its impact on R. ferrugineum in India.DiscussionThis discovery emphasizes the need for vigilant monitoring, disease management research, and conservation efforts to protect the cultural and ecological significance of this iconic shrub. Beyond its immediate findings, the study introduces a novel dimension to Indian flora by associating C. tuberculata with R. ferrugineum, historically linked to monocotyledonous crops. The research methodology combines traditional microscopic examination with advanced genomic sequencing and phylogenetic analysis, enhancing pathogen identification accuracy.Future prospectIn a broader context, this research aligns with the United Nations Sustainable Development Goals (SDGs) by highlighting the importance of environmental preservation, conservation, and sustainable management. It underscores the intricate interplay between biodiversity, cultural heritage, and the need for holistic solutions. Overall, this study calls for proactive measures to protect R. ferrugineum’s cultural and ecological heritage and emphasizes the significance of interdisciplinary approaches in addressing emerging ecological threats.

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The draft genome sequence and characterization of Exserohilum rostratum, a new causal agent of maize leaf spot disease in Chinese Mainland

Cheng²,

Geng³

et al. 2022

Eur J Plant Pathol

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First report of Exserohilum leaf spot: a unique halophilic pathogen in Cucumis sativus in the South Bengal area of India

Cited by 7 publications

References 28 publications

Unraveling the dynamics of wheat leaf blight complex: isolation, characterization, and insights into pathogen population under Indian conditions

Unraveling the dynamics of wheat leaf blight complex: isolation, characterization, and insights into pathogen population under Indian conditions

Unveiling Curvularia tuberculata-induced leaf anomalies in Rhododendron ferrugineum: implications in cultural-ecological conservation and harnessing microbial intervention in socio-economic advancement

The draft genome sequence and characterization of Exserohilum rostratum, a new causal agent of maize leaf spot disease in Chinese Mainland

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