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Phytoalexin

Definition

noun, plural: phytoalexins

Any of the chemicals produced de novo by plants in order to counter pathogens and pests


Supplement

Phytoalexins refer to different chemicals involved in plant immune defense mechanism. Plants produce phytoalexins to combat plant pathogens and pests. Examples include terpenoids, alkaloids, and glycosteroids. These chemicals accumulate immediately in areas where there is 'stress', such as those caused by infections, diseases, and parasitism. Some of these chemicals have antimicrobial properties, such as the ability to disrupt the cell wall or the metabolism of an invading microorganism.


Word origin: Greek phuton (plant) + Greek alexein (to ward off)

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The Fiber Disease

... plants or elicitation of cell cultures initiates substantial metabolic changes directed at the induction of defence reactions. The antimicrobial phytoalexins deserve special attention because they represent one essential component of plant resistance. The great structural diversity of phytoalexins ...

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by London
Sun Oct 01, 2006 8:50 pm
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 5491412

it's by Mycotine or Virus?

... th upper one..the upper one just get curlied but no chlorocys were spotted. After reading and reading I found that plants use substances named Phytoalexin and PR (Pathogenic-Related) protein to supress the virus and depositioning the lignin. @Andrew Still remember plant hormone named Brassinolide ...

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by victor
Mon Oct 17, 2005 12:26 pm
 
Forum: Botany Discussion
Topic: it's by Mycotine or Virus?
Replies: 16
Views: 6836


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