Soybean target spot caused by Corynespora cassiicola: a resurgent disease in the Americas

Molina, Juan Pablo Edwards; Navarro, Bárbara Ludwig; Allen, Tom; Godoy, C. V.

doi:10.1007/s40858-022-00495-z

Cited by 9 publications

(6 citation statements)

References 79 publications

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“…Corynespora cassiicola was even observed to infect soybeans [ Glycine max (L.) Merr. ], extracting nutrients from leaves, stems, pods, seeds, and roots or surviving in an endophytic relationship with soybeans (Edwards Molina et al, 2022 ).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the control efficacy of antagonistic bacteria from V-Ti magnetite mine tailings on kiwifruit brown spots in pot and field experiments

Cui,

Zhu,

Dong

et al. 2024

Front. Microbiol.

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Seemingly barren heavy-metal-polluted vanadium (V) and titanium (Ti) magnetite mine tailings contain various functional microbes, yet it is unclear whether this includes microbial resources relevant to the biological control of plant diseases. Kiwifruit brown leaf spot disease, caused by Corynespora cassiicola, can seriously reduce kiwifruit yield. To discover effective control measures for kiwifruit leaf spot, 18 bacteria strains among 136 tailing-isolated bacteria from V-Ti magnetite mine tailings were identified as inhibiting C. cassiicola by the confrontation plate method, indicating that antagonistic bacteria surviving in the V-Ti magnetite mine tailings were present at a low level. The 18 antagonistic strains could be divided into two BOX-A1R clusters. The 13 representative strains that were selected for phylogenetic tree construction based on their 16S rRNA sequences belonged to the Bacillus genus. Five predominant strains exhibited different toxin-production times and intensities, with four of them initiating toxin production at 32 h. Among them, Bacillus sp. KT-10 displayed the highest bacteriostatic rate (100%), with a 37.5% growth inhibition rate and an antagonistic band of 3.2 cm against C. cassiicola. Bacillus sp. KT10 also showed a significant inhibitory effect against the expansion speed of kiwifruit brown spots in the pot. The relative control effect was 78.48 and 83.89% at 7 days after the first and last spraying of KT-10 dilution, respectively, confirming a good effect of KT-10 on kiwifruit brown leaf spots in the field. This study demonstrated for the first time that there are some antagonistic bacteria to pathogenic C. cassiicola in V-Ti magnetite mine tailings, and Bacillus sp. KT10 was found to have a good control effect on kiwifruit brown leaf spots in pots and fields, which provided an effective biological control measurement for kiwifruit brown leaf spots.

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Section: Discussionmentioning

confidence: 99%

Evaluation of the control efficacy of antagonistic bacteria from V-Ti magnetite mine tailings on kiwifruit brown spots in pot and field experiments

Cui,

Zhu,

Dong

et al. 2024

Front. Microbiol.

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“…Table 1 presents a summary of the current status of breeding efforts in different crops. Although C. cassiicola plant diseases have been reported since the 1960s (Ramakrishnan and Pillay, 1961;Blazquez, 1967), breeding for resistance to C. cassiicola diseases has not been a primary focus (Pernezny and Simone, 1999;Edwards Molina et al, 2022), and disease management has relied on the use of fungicide sprays (Chee, 1990;MacKenzie et al, 2018;de Castro Costa et al, 2023). Disease resistance has been identified in tomato, rubber tree, soybean and cucumber (Bliss et al, 1973;Narayanan and Mydin, 2012;Wen et al, 2015;de Castro Costa et al, 2023).…”

Section: Resistance Breeding Efforts In Cropsmentioning

confidence: 99%

“…The main goal of this review is to address the status of resistance breeding efforts against C. cassiicola, and the potential role of host-specific toxins in such efforts. Reviews discussing the morphology, host range, and diversity of C. cassiicola, as well as the etiology, epidemiology, and management of associated diseases are available (Pernezny and Simone, 1999;MacKenzie et al, 2018;Rondon and Lawrence, 2021;Edwards Molina et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Need for disease resistance breeding against Corynespora cassiicola in crops

Sierra-Orozco,

Sandoya,

Lee

et al. 2023

Front. Agron.

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Corynespora cassiicola (Cc) is a genetically diverse ascomycete found worldwide in tropical and subtropical regions. Cc causes necrotrophic diseases in several plant species, including important crops such as rubber tree, tomato, cotton, and cucumber. Evidence suggests the involvement of one or more Cc host-specific toxins in disease progression. Management of Cc crop diseases is based mainly on pesticide sprays. However, the pathogen’s development of resistance to commonly used fungicides is documented. Resistance breeding is an attractive alternative or supplement to chemical control of Cc crop diseases, but research on this topic is very limited. This review describes the current plant resistance breeding efforts towards Cc resistance and discusses the potential influence of host-specific toxins (HSTs) on such efforts. Although some reports of host resistance exist in a few crops, resistant germplasm and knowledge about resistance mechanisms are limited. Some studies have suggested the involvement of HSTs in disease development, including the upregulation of resistance-related proteins in susceptible reactions and the recessive nature of resistance. In light of this, host resistance may not be achieved through commonly used dominant R-genes.

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“…It has a wide host range across plant species ( Farr and Rossman, 2017 ), but may be best known for causing Corynespora leaf fall of rubber ( Hevea brasiliensis ), a devastating disease resulting in severe economic losses in Asia and Africa ( Chee, 1990 ). Recently, C. cassiicola has been causing emerging target spot epidemics in the southeastern United States (US) on cotton ( Gossypium hirsutum ) ( Campbell et al., 2012 ; Edmisten, 2012 ; Fulmer et al., 2012 ; Mehl and Phipps, 2013 ; Price et al., 2015 ; Butler et al., 2016 ), soybean ( Glycine max ) ( Koenning et al., 2006 ; Bennett, 2016 ; Faske, 2016 ; Edwards Molina et al., 2022 ), and tomato ( Solanum lycopersicon ) ( Schlub et al., 2009 ). Phylogenetic and population genetic analyses of C. cassiicola from cotton, soybean, and tomato in the southeastern US showed three genetically distinct populations that clustered based on the host of origin ( Sumabat et al., 2018a ; Sumabat et al., 2018b ).…”

Section: Introductionmentioning

confidence: 99%

Comparative genomics of host-specialized populations of Corynespora cassiicola causing target spot epidemics in the southeastern United States

Dacones¹,

Kemerait²,

Brewer³

2022

Front. Fungal Biol.

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Numerous plant-pathogenic fungi secrete necrotrophic effectors (syn. host-selective toxins) that are important determinants of pathogenicity and virulence in species that have a necrotrophic lifestyle. Corynespora cassiicola is a necrotrophic fungus causing emerging target spot epidemics in the southeastern United States (US). Previous studies revealed that populations of C. cassiicola from cotton, soybean, and tomato are clonal, host specialized and genetically distinct. Additionally, cassiicolin – the necrotrophic effector identified in some C. cassiicola isolates – is an important toxin for virulence on rubber. It is encoded by seven Cas gene variants. Our goal was to conduct comparative genomic analyses to identify variation among putative necrotrophic effector genes and to determine if lack of one of the mating-types explained clonal populations in C. cassiicola causing outbreaks in the southeastern US and the apparent absence of sexual reproduction worldwide. A total of 12 C. cassiicola genomes, with four each from isolates from tomato, soybean, and cotton, were sequenced using an Illumina Next Seq platform. Each genome was assembled de novo, compared with the reference genome from rubber, and searched for known Cas, and other gene clusters with homologs of secondary metabolites. Cas2 and/or Cas6 were present in isolates from soybean in the southeastern US, whereas Cas1 and Cas2 were present in isolates from cotton in the southeastern US. In addition, several toxin genes, including the T-toxin biosynthetic genes were present in all C. cassiicola from cotton, soybean, and tomato. The mating-type locus was identified in all of the sequenced genomes, with the MAT1-1 idiomorph present in all cotton isolates and the rubber isolate, whereas the MAT1-2 idiomorph was present in all soybean isolates. We developed a PCR-based marker for mating-type in C. cassiicola. Both mating types were present in isolates from tomato. Thus, C. cassiicola has both mating-types necessary for sexual reproduction, but the absence of both mating-types within soybean and cotton populations could explain clonality in these populations. Variation in necrotrophic effectors may underlie host specialization and disease emergence of target spot on cotton, soybean, and tomato in the southeastern US.

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Soybean target spot caused by Corynespora cassiicola: a resurgent disease in the Americas

Cited by 9 publications

References 79 publications

Evaluation of the control efficacy of antagonistic bacteria from V-Ti magnetite mine tailings on kiwifruit brown spots in pot and field experiments

Evaluation of the control efficacy of antagonistic bacteria from V-Ti magnetite mine tailings on kiwifruit brown spots in pot and field experiments

Need for disease resistance breeding against Corynespora cassiicola in crops

Comparative genomics of host-specialized populations of Corynespora cassiicola causing target spot epidemics in the southeastern United States

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