Research Trends in Hormetic Stimulation Effects of Herbicides in Plants
2012
Pyon, J.Y., ReSEAT Program, Korea Institute of Science and Technology Information, Daejeon, Republic of Korea | Uddin, Md Romij, Chungnam National University, Daejeon, Republic of Korea | Kim, S.W., ReSEAT Program, Korea Institute of Science and Technology Information, Daejeon, Republic of Korea | Park, K.W., Chungnam National University, Daejeon, Republic of Korea
Hormesis is a dose-response phenomenon that is characterized by low-dose stimulation and high-dose inhibition. This biphasic dose-responses have had a long and extensive history in the fields of chemical toxicology, radiation biology and pharmacology. Hormesis has been found from bacteria, fungi, plants and animals, but hormesis in plants has received relatively little attention. Thus principles, occurrence, factors affecting the expression of hormetic responses, and their mechanisms in plants induced by herbicides are reviewed to provide the potentials for crop enhancement. Bromacil, bromoxynil, chloramben, propachlor, terbacil, EPTC, MSMA, and glyphosate at low doses showed stimulatory response in growth. Subtoxic dose of glyphosate increased sucrose content in sugarcane that is used worldwide in sugarcane production. Low dose of protoporphyrinogen-inhibiting herbicides induced increased pathogen defence, and low dose of triazine herbicides improved nitrogen metabolism and increased protein content in some crops. Further researches on potential benefits and risks of hormesis and its mechanism are needed for application of crop enhancement in agriculture.
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