Stress metabolites by plant

Plant under the stress by disease microorganisms produce stress metabolites, known as phytoalexins, which provide a natural defines.

Phytoalexins are usually elicited locally at the site of attack. Some evidence exists for accumulation of phytoalexins in edible tissue, particularly in potatoes and sweet potatoes.

Some phytoalexins have been demonstrated to be toxic to humans, but it is difficult at this time assess the potential toxicological implication of increased level of phytoalexins in human foods. 
Stress metabolites by plant