The effect of ultraviolet radiation on the germination of Nosema algerae Vavra and Undeen (Microsporida: Nosematidae) spores

Journal Article · Tue May 01 00:00:00 EDT 1990 · Journal of Protozoology; (USA)

DOI:https://doi.org/10.1111/j.1550-7408.1990.tb01127.x· OSTI ID:6644948

Undeen, A H; Vander Meer, R K ^[1]

---

1. Insects Affecting Man and Animals Research Laboratory, Gainesville, FL (USA)

Spores of Nosema algerae Vavra and Undeen were subjected to various dosages of 254 nm ultraviolet radiation (UV). Very high dosages of UV were required to block germination. Germination was normal immediately after UV dosages of 0.2 to 1.0 J/cm2, followed by a delayed effect in which both percentage germination and the intrasporal concentration of trehalose decreased with time after UV exposure. Although a few spores were germinated, most of them were inactivated (rendered temporarily unable to germinate) by exposure to UV of 1.1 J/cm2. Ultraviolet radiation between 1.1 and 3.4 J/cm2 stimulated spores to germinate. However, spores were completely unable to germinate immediately after exposure to dosages above 3.8 J/cm2. Ammonia had little effect on stimulation by UV but was inhibitory to germination after stimulation had occurred. These results demonstrate that UV behaves like a germination stimulus and are discussed in terms of the hypothesis that germination is initiated by the breakdown of barriers between trehalose and trehalase.

• OSTI ID: 6644948
• Journal Information: Journal of Protozoology; (USA), Vol. 37:3; ISSN 0022-3921
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
PROTOZOA
BIOLOGICAL RADIATION EFFECTS
SPORES
GERMINATION
DOSE-RESPONSE RELATIONSHIPS
INHIBITION
ULTRAVIOLET RADIATION
ANIMALS
BIOLOGICAL EFFECTS
ELECTROMAGNETIC RADIATION
INVERTEBRATES
MICROORGANISMS
RADIATION EFFECTS
RADIATIONS
560130* - Radiation Effects on Microorganisms