The Occurrence of Hormesis in Plants and Algae

Cedergreen, Nina; Streibig, Jens C.; Kudsk, Per; Mathiassen, Solvejg K.; Duke, Stephen O.
April 2007
Dose-Response;2007, Vol. 5 Issue 2, p150
Academic Journal
This paper evaluated the frequency, magnitude and dose/concentration range of hormesis in four species: The aquatic plant Lemna minor, the micro-alga Pseudokirchneriella subcapitata and the two terrestrial plants Tripleurospermum inodorum and Stellaria media exposed to nine herbicides and one fungicide and binary mixtures thereof. In total 687 dose-response curves were included in the database. The study showed that both the frequency and the magnitude of the hormetic response depended on the endpoint being measured. Dry weight at harvest showed a higher frequency and a larger hormetic response compared to relative growth rates. Evaluating hormesis for relative growth rates for all species showed that 25% to 76% of the curves for each species had treatments above 105% of the control. Fitting the data with a dose-response model including a parameter for hormesis showed that the average growth increase ranged from 9±1% to 16±16% of the control growth rate, while if measured on a dry weight basis the response increase was 38±13% and 43±23% for the two terrestrial species. Hormesis was found in >70% of the curves with the herbicides glyphosate and metsulfuron-methyl, and in >50% of the curves for acifluorfen and terbuthylazine. The concentration ranges of the hormetic part of the dose-response curves corresponded well with literature values.


Related Articles

  • Low-dose Radiation-Induced Protective Process and Implications for Risk Assessment, Cancer Prevention, and Cancer Therapy. Scott, B. R. // Dose-Response;2007, Vol. 5 Issue 2, p131 

    A low-dose protective apoptosis-mediated (PAM) process is discussed that appears to be turned on by low-dose gamma and X rays but not by low-dose alpha radiation. PAM is a bystander effect that involves cross-talk between genomically compromised [e.g., mutants, neoplastically transformed,...

  • Radiation-Induced Neoplastic Transformation in Vitro, Hormesis and Risk Assessment. Redpath, J. Leslie; Elmore, Eugene // Dose-Response;2007, Vol. 5 Issue 2, p123 

    Dose-response curves for various low-LET radiation sources have consistently been demonstrated to be J-shaped for the cancer-relevant endpoint of neoplastic transformation in vitro. Most of these studies have been performed where the radiation has been delivered at intermediate to high...

  • TNF-α and Microglial Hormetic Involvement in Neurological Health & Migraine. Kraig, Richard P.; Mitchell, Heidi M.; Christie-Pope, Barbara; Kunkler, Phillip E.; White, David M.; Tang, Ya-Ping; Langan, George // Dose-Response;2010, Vol. 8 Issue 4, p389 

    Environmental enrichment, i.e., increased intellectual, social, and physical activity makes brain more resilient to subsequent neurological disease. The mechanisms for this effect remain incompletely defined, but evidence shows tumor necrosis factor-alpha (TNF-α) is involved. TNF-α, at...

  • Association Between Local External Gamma Rays and Frequency of Cancer in Babol-Iran. Monfared, Ali Shabestani; Hajian, Karimollah; Hosseini, Reza; Nasir, Akbar // Dose-Response;2010, Vol. 8 Issue 3, p368 

    Introduction: The effect of natural background radiation on Cancer is still challenging. The investigation of association between external gamma rays and Cancer was the main goal of study. Materials & Methods: External Gamma rays were measured using a radiation survey meter in 184 urban and...

  • Radio-Adaptive Response to Environmental Exposures at Chernobyl. Rodgers, Brenda E.; Holmes, Kristen M. // Dose-Response;2008, Vol. 6 Issue 2, p209 

    The genetic consequences resulting from environmental exposure to ionizing radiation have a significant impact on both radiation regulatory policies and the comprehension of the human health risks associated with radiation exposure. The primary objectives of the study were to assess 1)...

  • Preface. Cuttler, Jerry; Mitchel, Ron // Dose-Response;2006, Vol. 4 Issue 4, p255 

    A preface for the October 2006 issue of "Dose-Response" is presented.

  • External occupational exposures in some NORM industries located at the South-West of Spain. Bolivar, J. P.; García-Tenorio, R. // AIP Conference Proceedings;8/7/2008, Vol. 1034 Issue 1, p364 

    Detailed mappings of the external exposures which can be received by the workers in two NORM industrial factories located at the South-West of Spain have been performed: one devoted to the production of phosphoric acid, and the other devoted to the production of titanium dioxide pigments. In...

  • Nonlinearity of Radiation Health Effects. Pollycove, Myron; Calabrese, Edward J. // Environmental Health Perspectives Supplements;Feb98 Supplement 1, Vol. 106, p363 

    Presents a study in which observations of fundamental biologic cellular functions contradict the theoretical presumption based on biophysical concepts about the health consequences of radiation exposure and exclude a linear nonthreshold hypothesis dose-response relationship.

  • Radiation Dose in the Selection of131 I or Surgical Treatment for Toxic Thyroid Adenoma. Gorma, Colum A.; Robertson, James S. // Annals of Internal Medicine;Jul78, Vol. 89 Issue 1, p85 

    Examines radiation dose in the selection of surgical treatment for toxic thyroid adenoma. Procedure used for computing the absorbed radiation dose in and near the thyroid nodule; Dose-effect modifying factors; Effects of dose-rate.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics