Steinernema

Steinernema
Steinernema carpocapsae
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Nematoda
Class: Chromadorea
Order: Rhabditida
Family: Steinernematidae
Genus: Steinernema
Travassos
Species

See text

Synonyms[1]
  • Neoaplectana Steiner, 1929
  • Patanodontus de Villalobos & Camino, 1997
  • Steineria Travassos, 1927

Steinernema is a genus of nematodes in the family of Steinernematidae.[2][3][4] The genus Steinernema is named after the nematologist Gotthold Steiner.[5]

Life cycle[edit]

Species form symbiotic relationships with Xenorhabdus and Photorhabdus bacteria.[6] The free-living third stage juvenile, termed a dauer juvenile, enters its insect hosts through natural openings, such as the mouth, anus, and spiracles.[6]

Steinernema scapterisci emerging from Scapteriscus vicinus

Bacterial cells from the intestines are regurgitated into the insect. The insect hemolymph provides a rich medium for the bacterial cells which grow, releasing toxins and exoenzymes, causing the insect host to die from septicemia.[6] The bacteria also produce other compounds to protect the insect from other microbes in the soil.[6]

The nematode moves out of its developmentally arrested third, nonfeeding stage, triggered by either bacterial or insect food signals. The nematodes feed on the bacteria and moult to the fourth stage, reaching adulthood within a few days. with separate male and female individuals.[6] Nematode development continues for two to three generations. When insufficient nutrient remain adult development is suppressed. Developmentally arrested third stage juveniles accumulate and emerge into the soil, where they may survive for months until a new suitable host is found.[6]

Species[edit]

The following species have been described:[2]

Use in agriculture[edit]

Species of this genus can infect insects and are used as a biopesticide to infect agricultural pests.[7] They can be used against a wide variety of species, including weevils, cutworms, gnats and mole crickets.[7]

References[edit]

  1. ^ ""Steinernema"". Global Biodiversity Information Facility. Retrieved 21 August 2021.
  2. ^ a b "Steinernema surkhetense - Overview". Encyclopedia of Life.
  3. ^ "Steinernema". www.uniprot.org.
  4. ^ Hunt, David J.; Nguyen, Khuong B. (2016). Advances in Entomopathogenic Nematode Taxonomy and Phylogeny. BRILL. ISBN 9789004285347.
  5. ^ "Steinernema" (in German). {{cite journal}}: Cite journal requires |journal= (help)
  6. ^ a b c d e f Subramanian, S.; Muthulakshmi, M. (2016), "Entomopathogenic Nematodes", Ecofriendly Pest Management for Food Security, Elsevier, pp. 367–410, doi:10.1016/b978-0-12-803265-7.00012-9, ISBN 978-0-12-803265-7, retrieved 2021-08-21
  7. ^ a b Denver, D.R.; Clark, K.A.; Raboin, M.J. (2011). "Reproductive mode evolution in nematodes: Insights from molecular phylogenies and recently discovered species". Molecular Phylogenetics and Evolution. 61 (2): 584–592. doi:10.1016/j.ympev.2011.07.007. PMID 21787872.

Further reading[edit]

  • Nguyen, Khuong B.; Hunt, D. David J. (2007). Entomopathogenic Nematodes: Systematics, Phylogeny and Bacterial Symbionts. BRILL. ISBN 978-9004152939.
  • Hunt, David J.; Nguyen, Khuong B. (2016). Advances in Entomopathogenic Nematode Taxonomy and Phylogeny. BRILL. ISBN 9789004285347.
  • Vega, Fernando E.; Kaya, Harry K. (2012). Insect Pathology. Academic Press. ISBN 9780123849847.
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