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Perspectives on the utilization of resistance mechanisms from host and nonhost plants for durable protection of Brassica crops against Alternaria blight

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Title Perspectives on the utilization of resistance mechanisms from host and nonhost plants for durable protection of Brassica crops against Alternaria blight
 
Creator Fatima, Urooj
Bhorali, Priyadarshini
Borah, S.
Senthil-Kumar, Muthappa
 
Subject Brassica
Alternaria Brassicae
Broad-spectrum defense
Blight-disease
Necrotrophic fungus
Nonhost resistance
 
Description Accepted date: 16th July 2019
Background: Alternaria brassicae, the causal organism of Alternaria blight, is a necrotroph infecting crops of the Brassicaceae family at all growth stages. To circumvent this problem, several disease management strategies are being used in the field, and disease-resistant varieties have also been developed. However, no strategy has proven completely successful, owing to the high variability in virulence among A. brassicae isolates, which causes a diverse spectrum of symptoms. Nonhost resistance (NHR) is a robust and broad-spectrum defense mechanism available in plants, and the exploitation of gene pools from plant species that are nonhost to A. brassicae could serve as novel sources of resistance.

Methodology: We searched the literature using key words relevant to this study in various search engines, such as PubMed, Web of Science, and Google Scholar, as well as certain journal websites. The literature was retrieved, sorted, and mined to extract data pertinent to the present review.

Results: In this review, we have comprehensively covered the recent progress made in developing Alternaria blight resistance in Brassica crops by exploiting host germplasm. We also enumerate the potential NHR sources available for A. brassicae and the NHR layers possibly operating against this pathogen. In addition, we propose different strategies for identifying NHR-related genes from nonhost plants and testing their relevance in imparting broad-spectrum resistance when transferred to host plants.

Conclusion: This review will help broaden the current knowledge base pertaining to the resistance sources available in host germplasm, the exploitation of NHR mechanisms, and their applications in protecting Brassica crops from Alternaria blight. The insights might also be applicable to a wider repertoire of plant pathogens.
 
Date 2019-08-20T10:57:52Z
2019-08-20T10:57:52Z
2019
 
Type Article
 
Identifier PeerJ, 7: e7486
2167-8359
http://223.31.159.10:8080/jspui/handle/123456789/971
https://peerj.com/
 
Language en_US
 
Format application/pdf
 
Publisher PeerJ, Inc.