Phytotoxicity associated to microcystins: a review

Area of Science:

• Environmental Toxicology
• Plant Physiology
• Food Safety

Background:

• Microcystins (MC) are prevalent cyanobacterial toxins known to cause poisoning in humans and animals.
• These toxins inhibit crucial enzymes, protein phosphatases 1 (PP1) and 2A (PP2A), which are also vital in plant systems.
• Plant exposure to microcystins can lead to bioaccumulation and adverse physiological effects.

Purpose of the Study:

• To investigate the impact of microcystins on plant physiology.
• To understand the implications of microcystin contamination in crop irrigation for food safety.

Main Methods:

• Review of existing studies on microcystin effects in aquatic and terrestrial plants.
• Analysis of physiological responses including enzyme inhibition, oxidative stress, and photosynthetic activity.
• Assessment of bioaccumulation in plant tissues.

Main Results:

• Microcystins inhibit plant protein phosphatases PP1 and PP2A.
• Observed effects in plants range from biomass reduction to oxidative stress, decreased photosynthesis, and apoptosis.
• Microcystins bioaccumulate in plant tissues, with varying effects from seedling to adult stages.

Conclusions:

• Irrigation with microcystin-contaminated water presents an economic and public health concern due to potential food contamination.
• Careful monitoring of water sources and crop exposure is essential to mitigate risks.