Bakane disease of Rice is due to

Options

A. NAA
B. 2 - 4D
C. IAA
D. GA

Answer

**Step-by-Step Solution:**

1. **Understanding Bakane Disease**: Bakane disease, also known as "foolish seedling disease," affects rice plants, causing them to grow abnormally tall and produce fewer tillers. The grains produced are often empty or only partially filled.

2. **Identifying the Cause**: The disease is linked to a specific fungus, Fusarium fuji-huroi, which releases a chemical known as gibberellin. Gibberellin is a plant hormone that promotes stem elongation.

3. **Analyzing the Options**: The question provides four options:
- NAA (naphthalene acetic acid)
- 2,4-D (2,4-dichlorophenoxyacetic acid)
- IAA (indoleacetic acid)
- GA (gibberellins)

4. **Evaluating Each Option**:
- **NAA**: This is an auxin that promotes root elongation, not stem elongation, so it cannot cause Bakane disease.
- **2,4-D**: This is a herbicide and does not relate to the symptoms of Bakane disease, making it an incorrect choice.
- **IAA**: Another auxin, IAA also promotes root growth and does not cause Bakane disease.
- **GA (Gibberellins)**: This hormone is known to promote stem elongation and is directly linked to the symptoms of Bakane disease.

5. **Conclusion**: The correct answer is GA (gibberellins), as it is the substance responsible for the abnormal growth seen in Bakane disease.

**Final Answer**: Bakane disease of rice is due to GA (gibberellins).

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