In which of the following genetically modified organism polygalacturonase gene is silenced ?

Options

A. Golden rice
B. Bt-cotton
C. Flavr-savr tomato
D. Bt-corn

Answer

To determine in which genetically modified organism the polygalacturonase gene is silenced, we can analyze the options provided: Golden Rice, Bt Cotton, Flower Sphere Tomato, and Bt Corn.

### Step-by-Step Solution:

1. **Understanding Polygalacturonase (PG)**:
- Polygalacturonase is an enzyme that plays a crucial role in the ripening of fruits. It breaks down pectin, a structural polysaccharide in the cell walls of fruits, leading to softening during ripening.

2. **Analyzing the Options**:
- **Golden Rice**: This genetically modified rice is enriched with beta-carotene (a precursor of vitamin A) but does not involve the silencing of the polygalacturonase gene.
- **Bt Cotton**: This is engineered for insect resistance using Bt proteins. It does not involve the silencing of the polygalacturonase gene.
- **Flower Sphere Tomato**: This was the first genetically modified food where the polygalacturonase gene was specifically silenced to delay ripening, allowing for longer shelf life.
- **Bt Corn**: Similar to Bt Cotton, this corn is modified for pest resistance and does not involve the silencing of the polygalacturonase gene.

3. **Conclusion**:
- Based on the analysis, the organism in which the polygalacturonase gene is silenced is **Flower Sphere Tomato**.

### Final Answer:
- The genetically modified organism in which the polygalacturonase gene is silenced is **Flower Sphere Tomato**.

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