Oomicide treated soybean seeds reduce early season stand loss to Phytophthora sojae

McCoy, Austin G.; Byrne, Adam M.; Jacobs, James J.; Anderson, G. B.; Kurle, Jim; Telenko, Darcy E. P.; Chilvers, Martin I.

doi:10.1016/j.cropro.2022.105984

Cited by 4 publications

(1 citation statement)

References 33 publications

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“…In addition, nine P. sansomeana isolates (C-KSSO2 3-6, VAL1602-84, C-NESO2 5-12, KSSO 6 − 1, MICO3-24, VAL1602-18, MPS17-24, V-KSSO2 3-6, and C-ISASO2 6-15) were used to investigate the resistance spectrum of the resistance gene. The above isolates were selected based on their diversity in aggressiveness, host range, and geographical distributions to best represent the screened P. sansomeana isolates (Rojas et al 2017;McCoy et al 2022). All the isolates were stored long term on potato carrot agar slants and hemp seed vials.…”

Section: Isolates Of P Sansomeanamentioning

confidence: 99%

Identification and molecular mapping of a major gene conferring resistance to Phytophthora sansomeana in soybean ‘Colfax’

Lin,

Salman,

Zhang

et al. 2024

Theor Appl Genet

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Phytophthora root rot (PRR) is one of the most important diseases in soybean (Glycine max). PRR is mainly caused by Phytophthora sojae, but recent studies showed that P. sansomeana is another causal agent of PRR with more aggressive symptoms, especially in seeds and seedlings. Unlike P. sojae which can be effectively managed by Rps genes, no known resistance genes have yet been reported for P. sansomeana. Our previous study screened 470 soybean germplasm for resistance to P. sansomeana and found that soybean 'Colfax' (PI 573008) carries major resistance to the pathogen. In this study, we crossed 'Colfax' with a susceptible parent 'Senaki' and developed three mapping populations with a total of 234 F2:3 families. Inheritance pattern analysis indicated a 1:2:1 ratio for resistant: segregating: susceptible lines among all the three populations, indicating a single dominant gene conferring the resistance in 'Colfax' (designated Rpsan1). Linkage analysis using extreme phenotypes anchored Rpsan1 to a 30Mb region on chromosome 3. By selecting 9 polymorphic SNP markers within the region, Rpsan1 was genetically delimited into a 21.3 cM region between Gm03_4487138_A_C and Gm03_5451606_A_C, which corresponds to a 1.06 Mb genomic region containing 9 NBS-LRR genes based on Gmax2.0 assembly. The mapping results were then validated using two breeding populations derived from 'E12076T-03' × 'Colfax' and 'E16099' × 'Colfax'. Marker-assisted resistance spectrum analyses with 9 more isolates of P. sansomeana indicated that Rpsan1 carries a broad resistance to P. sansomeana isolates and has strong merit in protecting soybean from PRR in the future. Key MessageThe rst single dominant resistance gene contributing major resistance to the oomycete pathogen Phytophthora sansomeana was identi ed and mapped from soybean 'Colfax'.

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Section: Isolates Of P Sansomeanamentioning

confidence: 99%

Identification and molecular mapping of a major gene conferring resistance to Phytophthora sansomeana in soybean ‘Colfax’

Lin,

Salman,

Zhang

et al. 2024

Theor Appl Genet

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A global-temporal analysis on Phytophthora sojae resistance-gene efficacy

McCoy,

Belanger,

Bradley

et al. 2023

Nat Commun

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Plant disease resistance genes are widely used in agriculture to reduce disease outbreaks and epidemics and ensure global food security. In soybean, Rps (Resistance to Phytophthora sojae) genes are used to manage Phytophthora sojae, a major oomycete pathogen that causes Phytophthora stem and root rot (PRR) worldwide. This study aims to identify temporal changes in P. sojae pathotype complexity, diversity, and Rps gene efficacy. Pathotype data was collected from 5121 isolates of P. sojae, derived from 29 surveys conducted between 1990 and 2019 across the United States, Argentina, Canada, and China. This systematic review shows a loss of efficacy of specific Rps genes utilized for disease management and a significant increase in the pathotype diversity of isolates over time. This study finds that the most widely deployed Rps genes used to manage PRR globally, Rps1a, Rps1c and Rps1k, are no longer effective for PRR management in the United States, Argentina, and Canada. This systematic review emphasizes the need to widely introduce new sources of resistance to P. sojae, such as Rps3a, Rps6, or Rps11, into commercial cultivars to effectively manage PRR going forward.

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Picarbutrazox Effectiveness Added to a Seed Treatment Mixture for Management of Oomycetes that Impact Soybean in Ohio

Dorrance,

Vargas,

Navarro-Acevedo

et al. 2024

Plant Disease

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None of the current oomycota fungicides are effective towards all species of Phytophthora, Phytopythium, Globisporangium, and Pythium that affect soybean seed and seedlings in Ohio. Picarbutrazox is a new oomyceticide with a novel mode of action towards Oomycete pathogens. Our objectives were to evaluate picarbutrazox to determine i) baseline sensitivity (EC50) to 189 isolates of 29 species, ii) the efficacy with a base seed treatment with three cultivars with different levels of resistance in 14 field environments; and iii) if the rhizosphere microbiome was affected by the addition of the seed treatment on a moderately susceptible cultivar. The mycelial growth of all isolates was inhibited beginning at 0.001µg and the EC50 ranged from 0.0013 to 0.0483 µg a.i. ml-1. The effect of seed treatment was significantly different for plant population and yield in 8 of 14 and 6 of 12 environments, respectively. The addition of picarbutrazox at 1 and 2.5 g a.i. 100 kg seed-1 to the base seed treatment compared to the base alone was associated with higher plant populations and yield in 3 and 1 environment, respectively. There was limited impact of the seed treatment mefenoxam 7.5 g a.i. plus picarbutrazox 1 g a.i. per 100 kg seed-1 on the oomycetes detected in the rhizosphere of soybean seedlings collected at the V1 growth stage. Picarbutrazox has efficacy towards a wider range of oomycetes that cause disease on soybean and this will be another oomyceticide tool to combat early season damping-off in areas where environmental conditions highly favor disease development.

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Oomicide treated soybean seeds reduce early season stand loss to Phytophthora sojae

Cited by 4 publications

References 33 publications

Identification and molecular mapping of a major gene conferring resistance to Phytophthora sansomeana in soybean ‘Colfax’

Identification and molecular mapping of a major gene conferring resistance to Phytophthora sansomeana in soybean ‘Colfax’

A global-temporal analysis on Phytophthora sojae resistance-gene efficacy

Picarbutrazox Effectiveness Added to a Seed Treatment Mixture for Management of Oomycetes that Impact Soybean in Ohio

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