Germplasm can be collected from many sources, where the preferred source of develop disease resistance is
1)Improved variety
2) Wild relative
3) Local variety
4) Plantlet from culture experiment

Options

A. Improved variety
B. Wild relative
C. Local variety
D. Plantlet from culture experiment

Answer

To solve the question regarding the preferred source for developing disease resistance in germplasm collection, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Germplasm**:
- Germplasm refers to the collection of genetic material that can be used for breeding and research purposes. It includes seeds, tissues, and other plant materials that contain genetic information.

**Hint**: Germplasm is essential for plant breeding and conservation of genetic diversity.

2. **Identifying the Purpose**:
- The question specifically asks for the preferred source of germplasm for developing disease resistance. This means we need to focus on sources that are known for their genetic diversity and ability to resist diseases.

**Hint**: Focus on sources that provide genetic traits for disease resistance.

3. **Evaluating Each Option**:
- **Option 1: Improved Variety**:
- Improved varieties are developed through selective breeding and may have resistance to specific diseases. However, they are not the primary source for developing broad disease resistance as they are often limited to specific traits.

**Hint**: Improved varieties are typically the result of breeding efforts rather than the source of genetic diversity.

- **Option 2: Wild Relative**:
- Wild relatives of cultivated plants often possess a wide range of genetic traits, including disease resistance. They are a preferred source because they have adapted to survive in the wild, often developing resistance to various pathogens.

**Hint**: Wild relatives are valuable for their genetic diversity and adaptability.

- **Option 3: Local Variety**:
- Local varieties are adapted to specific environments but may not possess the broad genetic traits needed for widespread disease resistance. They are limited in genetic diversity compared to wild relatives.

**Hint**: Local varieties are often region-specific and may lack the broad adaptability needed for disease resistance.

- **Option 4: Plantlet from Culture Experiment**:
- Plantlets from culture experiments are usually derived from disease-free tissues. While they can be useful for propagation, they do not provide genetic diversity or disease resistance traits.

**Hint**: Disease-free plantlets do not contribute to developing disease resistance.

4. **Conclusion**:
- After evaluating all options, the preferred source for developing disease resistance in germplasm collection is **Option 2: Wild Relative**. This option provides the necessary genetic diversity and traits for resistance against various diseases.

### Final Answer:
**The preferred source of germplasm for developing disease resistance is: Option 2 - Wild Relative.**