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Title: Developmental changes in the sensitivity of Volvox to ultraviolet light

Abstract

The response of Volvox to ultraviolet irradiation was analyzed. Young individuals isolated from a synchronous culture were exposed to UV light (120 J/m2) and subjected to variable length periods of dark following irradiation. The major effect of the UV treatment was the inability of the gonidia present in the colonies at the time of irradiation to continue and complete the developmental program. Individuals show a heightened sensitivity to UV for a limited period immediately following inversion and are insensitive at other stages of development. The cytotoxic effect of UV during this interval is completely reversed by the immediate exposure to white light and is increased with longer periods of dark treatment prior to exposure to white light. The temporal profile of the sensitivity defines a smooth curve in which the maximal sensitivity occurs three hours after inversion. The response to higher doses of UV (up to 500 J/m2) is a nonlinear increase in cytotoxicity and is disproportionately greater in those individuals just prior to the period of maximal sensitivity than those later in development. The results suggest that Volvox has at least two pathways for the repair of UV damage and that one of these, the principal dark repair pathway,more » is temporarily deficient in the gonidia of young individuals.« less

Authors:
;
Publication Date:
Research Org.:
Univ. of Virginia, Charlottesville (USA)
OSTI Identifier:
6769002
Resource Type:
Journal Article
Journal Name:
Dev Genet; (United States)
Additional Journal Information:
Journal Volume: 6:4
Country of Publication:
United States
Language:
English
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; MASTIGOPHORA; RADIOSENSITIVITY; DOSE-RESPONSE RELATIONSHIPS; ULTRAVIOLET RADIATION; ELECTROMAGNETIC RADIATION; RADIATIONS; 560130* - Radiation Effects on Microorganisms

Citation Formats

Baran, G J, and Huskey, R J. Developmental changes in the sensitivity of Volvox to ultraviolet light. United States: N. p., 1986. Web.
Baran, G J, & Huskey, R J. Developmental changes in the sensitivity of Volvox to ultraviolet light. United States.
Baran, G J, and Huskey, R J. 1986. "Developmental changes in the sensitivity of Volvox to ultraviolet light". United States.
@article{osti_6769002,
title = {Developmental changes in the sensitivity of Volvox to ultraviolet light},
author = {Baran, G J and Huskey, R J},
abstractNote = {The response of Volvox to ultraviolet irradiation was analyzed. Young individuals isolated from a synchronous culture were exposed to UV light (120 J/m2) and subjected to variable length periods of dark following irradiation. The major effect of the UV treatment was the inability of the gonidia present in the colonies at the time of irradiation to continue and complete the developmental program. Individuals show a heightened sensitivity to UV for a limited period immediately following inversion and are insensitive at other stages of development. The cytotoxic effect of UV during this interval is completely reversed by the immediate exposure to white light and is increased with longer periods of dark treatment prior to exposure to white light. The temporal profile of the sensitivity defines a smooth curve in which the maximal sensitivity occurs three hours after inversion. The response to higher doses of UV (up to 500 J/m2) is a nonlinear increase in cytotoxicity and is disproportionately greater in those individuals just prior to the period of maximal sensitivity than those later in development. The results suggest that Volvox has at least two pathways for the repair of UV damage and that one of these, the principal dark repair pathway, is temporarily deficient in the gonidia of young individuals.},
doi = {},
url = {https://www.osti.gov/biblio/6769002}, journal = {Dev Genet; (United States)},
number = ,
volume = 6:4,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1986},
month = {Wed Jan 01 00:00:00 EST 1986}
}