Dikaryotisation occurs in Puccinia on

Options

A. Upper surface of Barberry leaf
B. Lower surface of Barberry leaf
C. Upper surface of wheat leaf
D. Lower surface of wheat leaf

Answer

**Step-by-Step Solution:**

1. **Understanding Dikaryotization**:
- Dikaryotization is a phase in the life cycle of certain fungi where two nuclei coexist in a single cell without fusing. This typically occurs after the fusion of hyphae from two different mating types.

2. **Identifying the Organism**:
- The organism in question is Puccinia, which is commonly known as rust fungi. It belongs to the class Basidiomycetes and is characterized as a digenetic fungus, meaning it requires two different hosts to complete its life cycle.

3. **Determining the Hosts**:
- Puccinia has two hosts: the primary host is the wheat plant, and the secondary host is the barberry plant. Understanding these hosts is crucial for identifying where dikaryotization occurs.

4. **Locating the Site of Dikaryotization**:
- Dikaryotization occurs during the life cycle of Puccinia when it infects the primary host. In this case, the primary host is wheat.

5. **Identifying the Specific Location on the Host**:
- The question asks for the specific location of dikaryotization on the wheat plant. It is known that dikaryotization occurs on the upper surface of the wheat leaf.

6. **Final Answer**:
- Therefore, the correct answer to the question "Dikaryotization occurs in Puccinia on" is the upper surface of the wheat leaf.

---