Spiroplasma kunkelii (corn stunt spiroplasma)
Index
- Pictures
- Identity
- Taxonomic Tree
- Notes on Taxonomy and Nomenclature
- Description
- Distribution Table
- Risk of Introduction
- Hosts/Species Affected
- Host Plants and Other Plants Affected
- Growth Stages
- Symptoms
- List of Symptoms/Signs
- Biology and Ecology
- Seedborne Aspects
- Vectors and Intermediate Hosts
- Impact
- Diagnosis
- Detection and Inspection
- References
- Distribution Maps
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Top of pageIdentity
Top of pagePreferred Scientific Name
- Spiroplasma kunkelii Whitcomb, Chen et al., 1986
Preferred Common Name
- corn stunt spiroplasma
International Common Names
- English: corn stunt disease; cSD; cSS; maize stunt spiroplasma; mSS; rio Grande corn stunt
EPPO code
- SPIRKU (Spiroplasma kunkelii)
Taxonomic Tree
Top of page- Domain: Bacteria
- Phylum: Firmicutes
- Class: Mollicutes
- Order: Entomoplasmatales
- Family: Spiroplasmataceae
- Genus: Spiroplasma
- Species: Spiroplasma kunkelii
Notes on Taxonomy and Nomenclature
Top of pageNine strains of spiroplasma subgroup I-3 (agent of corn stunt disease) were similar in their serological properties. Strain E275T was shown to belong to the class Mollicutes by the ultrastructure of the limiting membrane, its prokaryotic organization, colonial morphology and filtration behaviour, and to the family Spiroplasmataceae by its helical morphology and motility (Whitcomb et al., 1986).
Description
Top of pageDistribution Table
Top of pageThe distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.
Last updated: 12 May 2022Continent/Country/Region | Distribution | Last Reported | Origin | First Reported | Invasive | Reference | Notes |
---|---|---|---|---|---|---|---|
North America |
|||||||
Belize | Present | ||||||
El Salvador | Present | ||||||
Guatemala | Present | ||||||
Honduras | Present | ||||||
Jamaica | Present | ||||||
Mexico | Present | ||||||
Nicaragua | Present | ||||||
Panama | Present | ||||||
United States | Present | ||||||
-California | Present | ||||||
-Florida | Present | ||||||
-Louisiana | Present | ||||||
-Michigan | Present | ||||||
-Mississippi | Present | ||||||
-Ohio | Present | ||||||
-Texas | Present | ||||||
South America |
|||||||
Argentina | Present, Localized | ||||||
Bolivia | Present | ||||||
Brazil | Present | ||||||
-Mato Grosso do Sul | Present | ||||||
-Minas Gerais | Present | ||||||
Colombia | Present | ||||||
Paraguay | Present | ||||||
Peru | Present | ||||||
Venezuela | Present |
Risk of Introduction
Top of pageDistribution: Western hemisphere
Seedborne Incidence: One report indicated that it was isolated onto culture media from maize seeds (mcg19).
Seed Transmitted: Not recorded
Seed Treatment: None
Overall Risk: Moderate
S. kunkelii is restricted in distribution to the western hemisphere, and is listed by the APPPC as an A1 quarantine risk.
Hosts/Species Affected
Top of pageHost Plants and Other Plants Affected
Top of pagePlant name | Family | Context | References |
---|---|---|---|
Zea mays (maize) | Poaceae | Main | |
Zea mays subsp. mays (sweetcorn) | Poaceae | Main | |
Zea mays subsp. mexicana (teosinte) | Poaceae | Other | |
Zea perennis | Poaceae | Other |
Symptoms
Top of pageSymptoms of corn stunt spiroplasma observed in Mexico varied with altitude. Some plants were consistently stunted with well-defined broad chlorotic streaking on the leaves. These symptoms are usually observed between 60 amd 940 m above sea level. Plants that were not always stunted but whose leaf margins showed red to purple streaks, and plants that usually were not stunted but whose leaves showed either a diffuse yellow or a chlorotic stripe condition with or without red margins, were observed at all elevations surveyed and usually appeared around 7 days before or after anthesis. ELISA was better than DFM at detecting S. kunkelii, but both methods demonstrated that all samples with the first type of symptom, 51-70% of those with the second type, 43-46% of those with the third type and 3-11% of those without symptoms were infected by S. kunkelii. The disease was more prevalent at lower than at higher elevations. These results indicate high prevalence and wide distribution of this spiroplasma in Mexico, and also confirm that maize plants having reddish or purplish leaves are often infected with S. kunkelii (Bajet and Renfro, 1989).
List of Symptoms/Signs
Top of pageSign | Life Stages | Type |
---|---|---|
Inflorescence / discoloration panicle | ||
Inflorescence / twisting and distortion | ||
Leaves / abnormal colours | ||
Leaves / abnormal forms | ||
Leaves / necrotic areas | ||
Leaves / yellowed or dead | ||
Stems / witches broom | ||
Whole plant / dwarfing |
Biology and Ecology
Top of pageSymptoms of corn stunt spiroplasma observed in Mexico varied with altitude. Some plants were consistently stunted with well-defined broad chlorotic streaking on the leaves. These symptoms were usually observed between 60 and 940 m above sea level. Plants that were not always stunted but whose leaf margins showed red to purple streaks, and plants that usually were not stunted but whose leaves showed either a diffuse yellow or a chlorotic stripe condition with or without red margins, were observed at all elevations surveyed and usually appeared around 7 days before or after anthesis. All samples with the first type of symptom, 51-70% of those with the second type, 43-46% of those with the third type and 3-11% of those without symptoms were infected by S. kunkelii. The disease was more prevalent at lower than at higher elevations. These results indicate high prevalence and wide distribution of this spiroplasma in Mexico, and also confirm that maize plants having reddish or purplish leaves are often infected with S. kunkelii (Bajet and Renfro, 1989).
Several strains of S. kunkelii were cloned in triplicate from one primary pure culture. All new strains were serologically closely related to known strains of S. kunkelii, but PAGE of membrane proteins revealed minor differences. Some were helical in cell shape, some were non-helical, and some were partially helical, consisting of helical and non-helical regions in the same cell (Lee and Davis, 1989). Nine strains of spiroplasma subgroup I-3 (agent of corn stunt disease) were similar in their serological properties. Strain E275T was shown to belong to the class Mollicutes by the ultrastructure of the limiting membrane, its prokaryotic organization, colonial morphology and filtration behaviour, and to the family Spiroplasmataceae by its helical morphology and motility (Whitcomb et al., 1986).
Seedborne Aspects
Top of pageOne report indicated that the pathogen was isolated onto culture media from maize seeds (Periera and Oliviera, 1971).
Effect on Seed Quality
Diseased plants are stunted and bear numerous small ear shoots. No seeds are produced on severely infected plants (McGee, 1988).
Seed Health Tests
The pathogen was isolated from seed onto culture media (Periera and Oliviera, 1971).
Vectors and Intermediate Hosts
Top of pageVector | Source | Reference | Group | Distribution |
---|---|---|---|---|
Dalbulus elimatus | Insect | |||
Dalbulus maidis | Insect | |||
Exitianus exitiosus | Insect | |||
Graminella nigrifrons | Insect | |||
Stirellus bicolor | Insect |
Impact
Top of pageDiagnosis
Top of pageOn serum-free medium LD59, non-helical strains of S. kunkelii produce minute 'fried egg' colonies (approximately 0.2 mm in diameter after 20 days' incubation), while partially helical strains produce small colonies with granular centres surrounded by satellite colonies. Strains with normal helicity in general produce large, uniformly diffuse colonies (up to 2 mm), but one helical strain (I-15) appeared to be non-motile in broth culture and it exhibited little translational motility in agar medium, accounting for development of minute granular colonies (approximately 0.2 mm in diameter) (Lee and Davis, 1989).
The pathogen can also be detected in plant tissues by ELISA (Gordon et al., 1985).
Detection and Inspection
Top of pageReferences
Top of pageDavis MJ, 1990. In: Klement, Rudolph, Sands, eds. Methods in Phytopathology. Budapest: Akademiai Kiado, 75-86.
Davis RE; Chen TA; Worley JF, 1981. Corn stunt spiroplasma. In: Gordon DT, Knoke JK, Scott GE, eds.Virus and Viruslike Diseases of Maize in the United States. South. Coop. Ser. Bull. 247, 40-50.
EPPO, 2014. PQR database. Paris, France: European and Mediterranean Plant Protection Organization. http://www.eppo.int/DATABASES/pqr/pqr.htm
Periera ALG; Oliviera BS, 1971. Causal agent of maize stunt infection isolated in culture media. Biologico, 37:215.
Distribution References
CABI, Undated. CABI Compendium: Status as determined by CABI editor. Wallingford, UK: CABI
Davis RE, Chen TA, Worley JF, 1981. Corn stunt spiroplasma. In: Virus and Viruslike Diseases of Maize in the United States. South. Coop. Ser. Bull. 247 [ed. by Gordon DT, Knoke JK, Scott GE]. 40-50.
Distribution Maps
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