Phytoalexins are secreted by plants in response to fungal reaction. These compounds are generally

Options

A. Proteins
B. Glycoproteins
C. Phenolic compounds
D. Lipids

Answer

To solve the question regarding phytoalexins and their characteristics, we can break down the information step by step.

### Step-by-Step Solution:

1. **Understanding Phytoalexins**:
- Phytoalexins are substances produced by plants as a defense mechanism against pathogens, particularly fungi.

2. **Characteristics of Phytoalexins**:
- They are **low molecular weight** compounds, meaning they consist of relatively small molecules.
- They are **phenolic compounds**, which means they contain a phenol group (a hydroxyl group attached to an aromatic hydrocarbon).

3. **Function of Phytoalexins**:
- These compounds exhibit **antimicrobial properties**, specifically antifungal activity. This is crucial as they help protect plants from fungal infections.

4. **Response to Stress**:
- Phytoalexins are synthesized and accumulated in response to **extrinsic stress**, such as microbial infections. This indicates their role in the plant's defense system.

5. **Pathogen Specificity**:
- Phytoalexins can be **pathogen-specific** in their toxicity, meaning different phytoalexins may be effective against different types of pathogens.

6. **Examples of Phytoalexins**:
- Some examples include **medicarpin**, **ricetin**, and **camalexin**, which further illustrate the diversity of these compounds.

7. **Conclusion**:
- Given the characteristics discussed, the correct answer to the question is that phytoalexins are generally classified as **phenolic compounds**.

### Final Answer:
Phytoalexins are generally **phenolic compounds**.

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