Virulence and Genetic Diversity of Puccinia spp., Causal Agents of Rust on Switchgrass (Panicum virgatum L.) in the USA

Bahri, Bochra A.; Tian, Peng; Rijal, Samikshya; Devos, Katrien M.; Bennetzen, Jeffrey L.; Smith, Shavannor M.

doi:10.3390/pathogens14020194

Virulence and Genetic Diversity of Puccinia spp., Causal Agents of Rust on Switchgrass (Panicum virgatum L.) in the USA

Journal Article · Thu Feb 13 23:00:00 EST 2025 · Pathogens

DOI:https://doi.org/10.3390/pathogens14020194· OSTI ID:2519268

; Tian, Peng; ; Devos, Katrien M.; Bennetzen, Jeffrey L.; Smith, Shavannor M.

Switchgrass (Panicum virgatum L.) is an important cellulosic biofuel grass native to North America. Rust, caused by Puccinia spp. is the most predominant disease of switchgrass and has the potential to impact biomass conversion. In this study, virulence patterns were determined on a set of 38 switchgrass genotypes for 14 single-spore rust isolates from 14 field samples collected in seven states. Single nucleotide polymorphism (SNP) variation was also assessed in 720 sequenced cloned amplicons representing 654 base pairs of the elongation factor 1-α gene from the field samples. Five major haplotypes were identified differing by 11 out of the 39 SNP positions identified. STRUCTURE, Principal Coordinate Analysis, and phylogenetic analyses divided the rust population into two genetic clusters. Virginia and Georgia had the highest and lowest rust genetic diversity, respectively. Only nine accessions showed a differential disease response between the 14 isolates, allowing the identification of eight races, differing by 1–3 virulence factors. Overall, the results suggested clonal reproduction of the pathogen and a North–South differentiation via local adaptation. However, similar haplotypes and races were also recovered from several states, suggesting migration events, and highlighting the need to further investigate the switchgrass rust population structure and evolution in the USA.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2519268

Journal Information:: Pathogens, Journal Name: Pathogens Journal Issue: 2 Vol. 14; ISSN 2076-0817; ISSN PATHCD

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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Local adaptation of both plant and pathogen: an arms‐race compromise in switchgrass rust

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Virulence and Genetic Diversity of Puccinia spp., Causal Agents of Rust on Switchgrass (Panicum virgatum L.) in the USA

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