Occurrence of wheat blast in Bangladesh and its implications for South Asian wheat production

Chowdhury, Apurba K.; Saharan, M. S.; Aggrawal, Rashmi; Malaker, P. K.; Barma, N. C. D.; Tiwari, T. P.; Duveiller, E.; Singh, Pawan Kumar; Srivastava, Amit Kumar; Sonder, Kai; Singh, Ravi P.; Braun, Hans J.; Joshi, Arun Kumar

doi:10.5958/0975-6906.2017.00001.3

Cited by 18 publications

(16 citation statements)

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“…However, it is not entirely reliable because the resistance is incomplete and sometimes background-dependent 38,41 . Hence, there is an urgent need to identify new resistance genes and sources of resistance to combat the deadly blast pathogen 4,5,41 .…”

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confidence: 99%

Genome-wide association mapping for wheat blast resistance in CIMMYT’s international screening nurseries evaluated in Bolivia and Bangladesh

Juliana

Kabir

et al. 2020

Sci Rep

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Wheat blast caused by the fungus Magnaporthe oryzae pathotype Triticum (MoT) is an emerging threat to wheat production. To identify genomic regions associated with blast resistance against MoT isolates in Bolivia and Bangladesh, we performed a large genome-wide association mapping study using 8607 observations on 1106 lines from the International Maize and Wheat Improvement Centre’s International Bread Wheat Screening Nurseries (IBWSNs) and Semi-Arid Wheat Screening Nurseries (SAWSNs). We identified 36 significant markers on chromosomes 2AS, 3BL, 4AL and 7BL with consistent effects across panels or site-years, including 20 markers that were significant in all the 49 datasets and tagged the 2NS translocation from Aegilops ventricosa. The mean blast index of lines with and without the 2NS translocation was 2.7 ± 4.5 and 53.3 ± 15.9, respectively, that substantiates its strong effect on blast resistance. Furthermore, we fingerprinted a large panel of 4143 lines for the 2NS translocation that provided excellent insights into its frequency over years and indicated its presence in 94.1 and 93.7% of lines in the 2019 IBWSN and SAWSN, respectively. Overall, this study reinforces the effectiveness of the 2NS translocation for blast resistance and emphasizes the urgent need to identify novel non-2NS sources of blast resistance.

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confidence: 99%

Genome-wide association mapping for wheat blast resistance in CIMMYT’s international screening nurseries evaluated in Bolivia and Bangladesh

Juliana

Kabir

et al. 2020

Sci Rep

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“…Although foliar chemical treatments are not effectively controlling wheat blast (Mottaleb et al ., 2018, 2019), seed treatments using benomyl would restrict the transmission of the blast pathogen from seed to seedling (Sadat and Choi, 2017); in Brazil, difenoconazole, a demethylation inhibitor, is used as the seed‐treating chemical against wheat blast (Pagani et al ., 2014; Castroagudín et al ., 2015; Ceresini et al ., 2019). As a foliar application, quinone‐outside inhibitors (strobilurins) are widely used against wheat blast in Brazil (Castroagudín et al ., 2015) but their continued use may result in the emergence of resistance to strobilurins for P. oryzae (Oliveira et al ., 2015; Chowdhury et al ., 2017). Farmers in Bangladesh were advised to apply Nativo 75 WG (Bayer CropScience; 25% trifloxystrobin + 50% tebuconazole) to restrict the spread of the pathogen (Sadat and Choi, 2017).…”

Section: Management Of Wheat Blastmentioning

confidence: 99%

A review on South Asian wheat blast: The present status and future perspective

Yesmin

Jenny²,

Abdullah

et al. 2020

Plant Pathology

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The outbreak of wheat blast (Pyricularia oryzae, syn. Magnaporthe oryzae) in Bangladesh and India in recent times is a cause of grave concern for future wheat production in South Asian countries. In this review, we focus on the origin and pathology of P. oryzae and its current status and impact on trade of wheat in South Asia. We also consider future directions for efficient detection, monitoring, forecasting, and managing this destructive disease. Proper detection and monitoring are essential for imposing disease management strategies. Cutting‐edge tools such as geospatial modelling and remote sensing technologies based on field observation will be pivotal to efficiently contain and manage the disease. Strong quarantine regulations too are critical in preventing the pathogen movement and are also discussed within. Complementary approaches, such as the induction of systemic resistance by applying plant growth‐promoting rhizobacteria or probiotic bacteria, are also considered here. This review provides a comprehensive summary on the status of wheat blast in South‐East Asia and will provide an important resource for wheat blast research in the affected areas.

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“…2, Fig. 5) [11,12,60,65,67,68]. Since wheat blast was reported for the first time in Bangladesh in 2016 [11,12,65], there is a possibility the disease will spread in South Asian countries particularly India, Pakistan, Nepal, and China [69,70].…”

Section: Wheat Blast: a New Threat To Food Securitymentioning

confidence: 99%

“…Adapted from [65]. began to develop short, medium, and long-term strategies to limit the spread of the disease as well as turn their attention to sustaining wheat production in this region to face the lethal disease [14,68,71]. Scientists and policymakers in the region took several initiatives in collaboration with CIMMYT, ACIAR, and the USA for the development of a wheat blast resistant wheat variety.…”

Section: Wheat Blast: a New Threat To Food Securitymentioning

confidence: 99%

Mitigating the twin problems of malnutrition and wheat blast by one wheat variety, ‘BARI Gom 33’, in Bangladesh

et al. 2019

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For the first time in history outside of Latin America, deadly wheat blast caused by the fungus Magnaporthe oryzae pathotype triticum (MoT) emerged in the 2015–2016 wheat (Triticum aestivum L.) season of Bangladesh. Bangladesh, a country in South Asia, has a population of nearly 160 million, of which 24.3% are classified as poor. Consequently, malnutrition and micronutrient deficiency are highly prevalent, particularly among school going children and lactating women. Bangladesh Wheat and Maize Research Institute (BWMRI), with the technical support of the International Maize and Wheat Improvement Center (CIMMYT), Mexico, has developed and released a new wheat ‘BARI Gom 33’. The new wheat is a zinc-enriched (Zn) biofortified wheat, resistant to the deadly wheat blast disease. ‘BARI Gom 33’ provides 5–8% more yield than the check varieties in Bangladesh. Rapid dissemination of it in Bangladesh, therefore, can not only combat wheat blast but also mitigate the problem of Zn deficiency and ensure income for resource-poor wheat farmers. Importantly, a large portion of the current wheat area in India and Pakistan is vulnerable to wheat blast, due to the similarities of the agro-climatic conditions of Bangladesh. As wheat blast is mainly a seed-borne disease, a rapid scaling out of the new wheat in Bangladesh can reduce the probability of MoT intrusion in India and Pakistan, and thereby generate positive externalities to the food security of more than 1 billion people in South Asia. This study explains the development process of ‘BARI Gom 33’; the status of malnutrition in Bangladesh, and the possible economic gain from a rapid scaling out of ‘BARI Gom 33’ in Bangladesh. A few policies are recommended based on the discussions.

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Occurrence of wheat blast in Bangladesh and its implications for South Asian wheat production

Cited by 18 publications

References 0 publications

Genome-wide association mapping for wheat blast resistance in CIMMYT’s international screening nurseries evaluated in Bolivia and Bangladesh

Genome-wide association mapping for wheat blast resistance in CIMMYT’s international screening nurseries evaluated in Bolivia and Bangladesh

A review on South Asian wheat blast: The present status and future perspective

Mitigating the twin problems of malnutrition and wheat blast by one wheat variety, ‘BARI Gom 33’, in Bangladesh

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