What Are Phytoalexins? Plant Defense Compounds Explained

Phytoalexins are stress-induced plant defense compounds synthesized when plants face environmental challenges such as UV exposure, pathogens, or injury.

Definition:

Phytoalexins are inducible, often polyphenolic compounds involved in redox and defense signaling.

These compounds are central to Sorghum bicolor phytoalexins, which function as plant defense molecules.

Sorghum bicolor produces rare phytoalexins known as 3-deoxyanthocyanidins in its leaf sheath. Some species contain unique Sorghum pigments that exhibit powerful bioactive properties.

Cross-Kingdom Insight:

Plant stress-response chemistry offers conceptual parallels to adaptive resilience biology in humans. This demonstrates how plants rely on plant defense response systems during stress.

FAQ:

What does phytoalexin mean?

A plant defense compound produced under stress.

Are phytoalexins antioxidants?

Some exhibit antioxidant activity, but they also influence signaling pathways.

Written by Olajuwon Okubena