First Report of Bacterial Leaf Spot Caused by <i>Pseudomonas syringae</i> pv. <i>tomato</i> on Kale in California

Koike, S. T.; Alger, E. I.; Sepulveda, L. Ramos; Bull, Carolee T.

doi:10.1094/pdis-10-16-1460-pdn

Cited by 8 publications

(6 citation statements)

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“…Among the numerous reports of disease emergence due to P. syringae, several suggest that the pathogen originated from epidemics on plant genera or species different from that on which emergence was reported. For example, the strains of P. syringae causing a new leaf spot on kale in California were considered to be a tomato pathogen (Koike et al 2017). Tomato has been reported to be a common host of a range of pathovars of P. syringae that attack crucifers including strains called pv.…”

Section: Introductionmentioning

confidence: 99%

The overlapping continuum of host range among strains in the Pseudomonas syringae complex

et al. 2019

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Pseudomonas syringae is the most frequently emerging group of plant pathogenic bacteria. Because this bacterium is ubiquitous as an epiphyte and on various substrates in non-agricultural settings, there are many questions about how to assess the risk for plant disease posed by strains in the environment. Although P. syringae is considered to have discrete host ranges in defined pathovars, there have been few reports of comprehensive comparisons of host range potential. Here we present results of host range tests for 134 strains, representing eight phylogroups, from epidemics and environmental reservoirs on 15 to 22 plant species per test conducted in four separate tests to determine the patterns and extent of host range. We sought to identify trends that are indicative of distinct pathotypes and to assess if strains in the P. syringae complex are indeed restricted in their host range. We show that for each test, strains display a diversity of host ranges from very restricted to very broad regardless of the gamut of phylogroups used in the test. Overall, strains form an overlapping continuum of host range potential with equal representation of narrow, moderate and broad host ranges. Groups of distinct pathotypes, including strains with currently the same pathovar name, could not be identified. The absence of groupings was validated with statistical tests for pattern recognition. The extent of host range was positively correlated with the capacity of strains to swarm on semi-solid agar medium and with the abundance of genes in biosynthetic clusters and was inversely correlated with the abundance of genes for proteins with transmembrane domains in their genomes. Our results are consistent with the current paradigm that disease symptoms are the result of multiple molecular interactions between P. syringae and its plant host that are modulated by abiotic and biotic conditions. This leads us to propose that pathovar denominations do not correspond to the underlying biology of P. syringae. A new concept of pathogenicity that accounts for the continuum of pathogenic potential in P. syringae would open new perspectives to understand the evolution of pathogenicity in this bacterium and new insights to anticipate disease and to manage plant health.

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Section: Introductionmentioning

confidence: 99%

The overlapping continuum of host range among strains in the Pseudomonas syringae complex

et al. 2019

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“…Samples taken from diseased plants. Time of sampling Sampling place, GPS coordinates Plant species Plant organs The end of April and May 2015, and October 2015 and 2017 Botanical Garden named after Gareev, Bishkek city 42°52'12'' N 74°35'24'' E Different varieties of apricots, plums, and peaches The affected shoots, leaves, barks ,and fruits May , and October 2015, and 2017 Bishkek city 42°52'12'' N 74°35'24'' E Different varieties of apricots and plums, cherries…”

Section: Methods and Materials Plant Sample Collectionmentioning

confidence: 99%

“…The affected shoots and leaves The end of April and May 2015, and October 2015, and 2017 '3.7'' N 76°59'35.9'' E 42°27'44.9'' N 76°11'23.9'' E…”

Section: Methods and Materials Plant Sample Collectionmentioning

confidence: 99%

“…The phytopatogenic pseudomonads cause plant diseases with different symptoms, including cankers, diebacks, blossom, twig, leaf or kernel blights, leaf spots (P. syringae different pathovars), soft and brown rots (P. viridiflava, P. marginalis different pathovars), tumors or galls (P. savastanoi pathovars), mushroom blights (P. tolasii, P. agarici pathovars), and tomato (P. syringae pv. tomato) (Koike et al, 2017;Braun-Kiewnick and Sands, 2001;Choi et al, 2016;Ahmed et al, 2018). Meanwhile, other authors noted that P. syringae strains form an overlapping continuum of host range potential with equal representation of narrow, moderate, and broad host ranges (Morris et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Pseudomonas syringae pv. syringae from Diseased Stone Fruits in Kyrgyzstan and Testing of Biological Agents against Pathogen

Döölotkeldieva

Bobusheva

2020

Int. J. Phytopathol.

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The plant diseases caused by the Pseudomonas syringae сomplex bacteria are economically important and occur worldwide on various plants, and it is as a pathogen that has not been the object of studies and little is known about its epidemiology in Kyrgyzstan. The conventional phenotypic (LOPAT, API tests) and PCR-assisted isolation were used for the identificationof Pseudomonas syringae pv. syringaе isolates from the affected organs of local stone fruits, such as peach (Prunus persica), cherry (Prunus subgen), apricot (Prunus armeniaca), and plum (Prunus salicina) samples taken from the Chy, Issuk-Kul, and Batken regions of the country. 16S rRNA gene amplification was performed with primers 27F (5'-AGA GTT TGA TCC TGG CTC AG -3') and 907R (5 '–CCG TCA ATT CCT TTG AGT TT-3') for the identification of obtained P.syringae pv. syringaе isolates. From 40 primary isolates of Gram-negative rod-shaped bacteria, 12 were identified as Pseudomonas syringae pv. syringae, while the remaining isolates were identified as bacteria from Stenotrophomonas, Xanthomonas, Erwinia genera. The antagonist bio control agent—Streptomyces bacteria strains were screened and selected against the bacterial canker pathogen in in vitro experiments and on apricot seedlings in vivo conditions. Obtained results could encourage to develop a local bio-product based on this bioagent for spraying stone fruits with the initial manifestation of disease symptoms and to conduct preventive treatments in the fall and spring to increase the plant's resistance to pathogens.

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“…), Bacterial Blight (pea), etc . and provoke significant economic losses worldwide. − The metabolites produced by such pathogens that are described as phytotoxins and virulence factors are syringomycin and syringopeptin, coronatine, phaseolotoxin, and tabtoxin (Figure ).…”

Section: Bacterial Virulence Factorsmentioning

confidence: 99%

Virulence Factors in the Phytopathogen–Host Interactions: An Overview

Pontes

Fernandes

Santos

et al. 2020

J. Agric. Food Chem.

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Phytopathogens are responsible for great losses in agriculture, once they are able to subvert or elude the host defense mechanisms through virulence factors secretion for their dissemination. Herein, it is reviewed phytotoxins that act as virulence factors and are produced by bacterial phytopathogens (Candidatus Liberibacter spp., Erwinia amylovora, Pseudomonas syringae pvs and Xanthomonas spp.) and fungi (Alternaria alternata, Botrytis cinerea, Cochliobolus spp., Fusarium spp., Magnaporthe spp., and Penicillium spp.), which were selected in accordance to their worldwide importance due to the biochemical and economical aspects. In the current review, it is sought to understand the role of virulence factors in the pathogen–host interactions that result in plant diseases.

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First Report of Bacterial Leaf Spot Caused by Pseudomonas syringae pv. tomato on Kale in California

Cited by 8 publications

References 3 publications

The overlapping continuum of host range among strains in the Pseudomonas syringae complex

The overlapping continuum of host range among strains in the Pseudomonas syringae complex

Characterization of Pseudomonas syringae pv. syringae from Diseased Stone Fruits in Kyrgyzstan and Testing of Biological Agents against Pathogen

Virulence Factors in the Phytopathogen–Host Interactions: An Overview

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