Frost resistance is obtained from genetically engineered

Options

A. Escherichia coli
B. Pseudomonas putida
C. Pseudomonas fluorescence
D. Trichoderma

Answer

To solve the question regarding which organism is genetically engineered to obtain frost resistance, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Frost Resistance**:
- Frost resistance refers to the ability of an organism or material to withstand freezing temperatures and repeated freeze-thaw cycles without suffering damage.

2. **Analyze the Given Options**:
- The options provided are:
- Acrychia coli
- Pseudomonas pituidae
- Pseudomonas fluorescens
- Trichoderma

3. **Identify Relevant Organisms**:
- Among the listed organisms, we need to identify which one is known for its frost resistance properties when genetically engineered.

4. **Research on Each Organism**:
- Acrychia coli: Generally known as E. coli, primarily used in biotechnology but not specifically for frost resistance.
- Pseudomonas pituidae: Less commonly referenced in frost resistance contexts.
- Pseudomonas fluorescens: Known for its ability to produce antifreeze proteins and has been genetically engineered for frost resistance.
- Trichoderma: A genus of fungi, primarily used for biocontrol and plant growth promotion, not specifically for frost resistance.

5. **Select the Correct Answer**:
- Based on the analysis, Pseudomonas fluorescens is the organism that has been genetically engineered to provide frost resistance.

### Final Answer:
Frost resistance is obtained from genetically engineered **Pseudomonas fluorescens**.