Wheat Blast in Bangladesh: The Current Situation and Future Impacts

Islam, Tofazzal; Kim, Kwang-Hyung; Choi, Jaehyuk

doi:10.5423/ppj.rw.08.2018.0168

Cited by 83 publications

(48 citation statements)

References 47 publications

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“…The blast fungus Magnaporthe oryzae can, however, infect more than 50 different grass species, including other major cereals such as barley, oats, finger millet, and wheat. Significant outbreaks of wheat blast have occurred in Brazil, Bangladesh [3,4], and, most recently, in Zambia [5]-now threatening wheat production on 3 continents. Understanding the biology of blast diseases is therefore important if new disease control strategies are to be developed.…”

Section: How Does the Rice Blast Fungus Puncture An Intact Leaf?mentioning

confidence: 99%

From appressorium to transpressorium—Defining the morphogenetic basis of host cell invasion by the rice blast fungus

et al. 2021

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Section: How Does the Rice Blast Fungus Puncture An Intact Leaf?mentioning

confidence: 99%

From appressorium to transpressorium—Defining the morphogenetic basis of host cell invasion by the rice blast fungus

et al. 2021

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“…Another impactful blast disease is wheat blast. In the mid 1980s the disease emerged on wheat plants in Brazil and has since spread across large regions of South America and, more recently, South Asia, demonstrating the ability of M. oryzae to rapidly undergo host-range expansions and global pandemics [45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Genomic rearrangements generate hypervariable mini-chromosomes in host-specific isolates of the blast fungus

et al. 2021

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Supernumerary mini-chromosomes–a unique type of genomic structural variation–have been implicated in the emergence of virulence traits in plant pathogenic fungi. However, the mechanisms that facilitate the emergence and maintenance of mini-chromosomes across fungi remain poorly understood. In the blast fungus Magnaporthe oryzae (Syn. Pyricularia oryzae), mini-chromosomes have been first described in the early 1990s but, until very recently, have been overlooked in genomic studies. Here we investigated structural variation in four isolates of the blast fungus M. oryzae from different grass hosts and analyzed the sequences of mini-chromosomes in the rice, foxtail millet and goosegrass isolates. The mini-chromosomes of these isolates turned out to be highly diverse with distinct sequence composition. They are enriched in repetitive elements and have lower gene density than core-chromosomes. We identified several virulence-related genes in the mini-chromosome of the rice isolate, including the virulence-related polyketide synthase Ace1 and two variants of the effector gene AVR-Pik. Macrosynteny analyses around these loci revealed structural rearrangements, including inter-chromosomal translocations between core- and mini-chromosomes. Our findings provide evidence that mini-chromosomes emerge from structural rearrangements and segmental duplication of core-chromosomes and might contribute to adaptive evolution of the blast fungus.

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“…Since the introduction of MoT from South America to Bangladesh, the affected areas have been increasing, despite the unfavorable weather conditions witnessed in the last few years ( Islam et al, 2019 ), demonstrating the adaptation of the pathogen to South Asian environment. This poses a great risk to the neighboring countries, especially India that shares a very long international border with Bangladesh and relies heavily on wheat production for food security ( Mottaleb et al, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Screening and Mapping for Head Blast Resistance in a Panel of CIMMYT and South Asian Bread Wheat Germplasm

Juliana

Kabir

et al. 2021

Front. Genet.

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Wheat blast (WB) is a destructive disease in South America and its first outbreak in Bangladesh in 2016 posed a great risk to food security of South Asian countries. A genome wide association study (GWAS) was conducted on a diverse panel of 184 wheat genotypes from South Asia and CIMMYT. Phenotyping was conducted in eight field experiments in Bolivia and Bangladesh and a greenhouse experiment in the United States. Genotypic data included 11,401 SNP markers of the Illumina Infinium 15K BeadChip and four additional STS markers on the 2NS/2AS translocation region. Accessions with stable WB resistance across experiments were identified, which were all 2NS carriers. Nevertheless, a dozen moderately resistant 2AS lines were identified, exhibiting big variation among experiments. Significant marker-trait associations (MTA) were detected on chromosomes 1BS, 2AS, 6BS, and 7BL; but only MTAs on 2AS at the 2NS/2AS translocation region were consistently significant across experiments. The resistant accessions identified in this study could be used in production in South Asian countries as a preemptive strategy to prevent WB outbreak.

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Wheat Blast in Bangladesh: The Current Situation and Future Impacts

Cited by 83 publications

References 47 publications

From appressorium to transpressorium—Defining the morphogenetic basis of host cell invasion by the rice blast fungus

From appressorium to transpressorium—Defining the morphogenetic basis of host cell invasion by the rice blast fungus

Genomic rearrangements generate hypervariable mini-chromosomes in host-specific isolates of the blast fungus

Screening and Mapping for Head Blast Resistance in a Panel of CIMMYT and South Asian Bread Wheat Germplasm

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