Copper toxicity in plants: a review and a case study on tea
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Date
2020-03
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University of North Bengal
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Abstract
Copper in trace amounts is essential for various metabolic processes in the plant such as
photosynthesis, carbohydrate distribution, and protein metabolism but at high concentration it
causes physiological stress through generation of free radicals that induce the production of
reactive oxygen species (ROS) via Haber-Weiss and Fenton reactions. Copper-induced
generation of hydrogen peroxide, hydroxyl radicals, or other reactive oxygen species has been
directly correlated with the damage to protein and lipids that may lead to reduced growth and
even death. Tea (Camellia sinensis L. (O.) Kuntze) is an economically important plantation
crop in India with round the year productivity. Copper based fungicides are cheap and
effective in controlling fungal diseases and are used consistently throughout the year to
combat different fungal diseases that pose a major threat to tea production. Excess Cu2+ has
been found to alter several physiochemical parameters in the tea plants. A more detailed study
on mechanisms of Cu2+ toxicity at the gene level is warranted.
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0974-6927