What is correct for stages of Puccinia?

Options

A. Telia and aecia on wheat
B. Telia and uredo stage on wheat
C. Telia and aecia on barberry
D. None

Answer

To answer the question about the correct stages of Puccinia, we need to understand the life cycle of this fungus, particularly focusing on its relationship with its hosts and the stages it undergoes.

### Step-by-Step Solution:

1. **Understanding Puccinia**: Puccinia is a genus of fungi known for causing diseases in cereal crops, particularly stem rust in wheat. It has a complex life cycle that requires two different hosts to complete.

2. **Identifying the Hosts**: The primary host for Puccinia is wheat, while the secondary host is often barberry (Berberis species). The life cycle of Puccinia involves different stages that occur on these two hosts.

3. **Stages of Puccinia**: The life cycle of Puccinia includes several stages:
- **Uredinia Stage**: This stage occurs on the primary host (wheat) and is characterized by the formation of urediniospores, which are responsible for the spread of the disease during the growing season.
- **Telia Stage**: Towards the end of the growing season, teliospores are formed. These are thick-walled, dikaryotic spores that remain dormant until conditions are favorable for germination.
- **Basidiospores and Asci**: The teliospores undergo karyogamy to produce basidiospores, which are then carried by the wind to the secondary host (barberry). On barberry, the basidiospores germinate to form haploid mycelium, which then produces asci containing ascospores.

4. **Correct Answer**: Based on the life cycle of Puccinia, the correct stages are "Talia and Ascia on Barberry." This indicates that the telial stage occurs on wheat, and the asci (which contain ascospores) are produced on the barberry.

### Final Answer:
The correct stages of Puccinia are "Talia and Ascia on Barberry."

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