Pathogenicity and infection behaviour of Exserohilum rostratum on wheat and associated collateral hosts.

Korra, Tulasi; Navathe, Sudhir; Chand, Ramesh

doi:10.21203/rs.3.rs-2027087/v1

Cited by 2 publications

(2 citation statements)

References 37 publications

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“…In the present study, E. rostratum was isolated from black point infected seeds as well as spot blotch infected leaf samples ( Table 1 ). E. rostratum has not been reported as a pathogen of wheat until recently when Korra et al (2022) proved its pathogenicity on wheat and many other cereals and studied its infection behavior. Through our study, we confirm the association of E. rostratum with wheat as a member of the leaf blight/spot blotch complex and highlight its potential as an economically important pathogen.…”

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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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%

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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“…In cultivated rice, a peak of conidia production from new lesions is observed 6 days after infection (Ou, 1985;Barnwal et al, 2013). Less is known about the infection cycle of E. rostratum on rice, but a recent histopathological study revealed that on contact with rice leaves, E. rostratum conidia produce appressoria within 24 h that directly penetrate the epidermal cells with the onset of symptoms within 3 days (Korra et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity and structure of Bipolaris oryzae and Exserohilum rostratum populations causing brown spot of rice in Burkina Faso based on genotyping-by-sequencing

et al. 2022

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In recent years, Brown spot disease of rice (BSR) has been observed on leaves and seeds of rice in all rice-growing areas of Burkina Faso. Bipolaris oryzae and Exserohilum rostratum are the main fungal species isolated from BSR infected tissues and they are frequently observed in the same field. However, we are lacking information on the genetic diversity and population structure of these fungi in Burkina Faso. The mode of reproduction is also unknown. The genetic diversity of isolates of B. oryzae (n=61) and E. rostratum (n=151), collected from major rice-growing areas of Burkina Faso, was estimated using genotyping-by-sequencing (GBS). The mean values for nucleotide diversity (π) were 1.9 x10-4 for B. oryzae and 4.8 x10-4 for E. rostratum. There is no genetic differentiation between the geographical populations of each species. The analysis of molecular variance revealed that 89% and 94% of the genetic variances were within the populations of B. oryzae and E. rostratum, respectively. For each species, four genetic clusters were identified by two clustering methods (DAPC and sNMF). The distribution of these genetic groups was independent of the geographical origin of the isolates. Evidence of recombination was detected in the populations of B. oryzae and E. rostratum. For B. oryzae balanced mating type ratios were supporting sexual reproduction. For E. rostratum overrepresentation of MAT1-2 isolates (79%) suggested a predominant asexual reproduction. This study provides important information on the biology and genetics of the two major fungi causing brown spot disease of rice in Burkina Faso.

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Pathogenicity and infection behaviour of Exserohilum rostratum on wheat and associated collateral hosts.

Cited by 2 publications

References 37 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

Genetic diversity and structure of Bipolaris oryzae and Exserohilum rostratum populations causing brown spot of rice in Burkina Faso based on genotyping-by-sequencing

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