Binucleate spores of Puccinia graminis released from Barberis (Barberry) leaf and responsible for initial infection in a wheat plant are called as

Options

A. pycnispores
B. aecidiospores
C. uredospores
D. teleutospores

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The question mentions "Puccinia graminis," which is a type of fungus known for causing rust diseases in plants, particularly wheat.

2. **Understand the Life Cycle**: Puccinia graminis has a complex life cycle that includes different types of spores. It typically requires two hosts to complete its life cycle: one being the Barberry plant (Berberis) and the other being wheat.

3. **Focus on the Spores**: The question specifically asks about the "binucleate spores" released from the Barberry leaf. In the life cycle of Puccinia graminis, these spores are known as "aeciospores."

4. **Function of Aeciospores**: Aeciospores are responsible for the initial infection in wheat plants. When they land on a suitable wheat host, they germinate and infect the plant, leading to the development of rust disease.

5. **Final Answer**: Therefore, the binucleate spores of Puccinia graminis released from Barberry leaves that are responsible for the initial infection in wheat plants are called **aeciospores**.