Peach PpPGIP1 Gene Silencing for Cold Tolerance
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Solution Overview
Problem
Current methods fail to effectively silence the Prunus persica polygalacturonase-inhibiting protein 1 (PpPGIP1) gene in peaches, which is crucial for regulating sucrose metabolism and enhancing cold tolerance, as previous attempts have not successfully inhibited the activity of vacuolar invertase (VIN) using Agrobacterium transformation.
Innovation Solution
A cloning method for the PpPGIP1 gene is developed, involving RNA extraction, reverse transcription, PCR amplification, and Agrobacterium transient transformation, which allows for the construction of a virus-induced gene silencing system to reduce PpPGIP1 expression and inhibit VIN activity, thereby improving cold tolerance in peaches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Agrobacterium transformation is used to silence PpPGIP1, then gene silencing should be achieved, but previous attempts have failed to effectively inhibit VIN activity
Solution Approach 1:
The patent modifies the Agrobacterium transformation parameters by optimizing co-cultivation conditions, using specific promoter constructs (35S promoter), and adjusting infection protocols to achieve effective silencing of PpPGIP1 that was not possible with previous methods
Solution Approach 2:
The patent uses a virus-induced gene silencing system as an intermediary mechanism, where viral vectors facilitate the silencing process and enable effective inhibition of PpPGIP1 expression and VIN activity through RNA interference mechanisms
2Object-affected harmful factors
If PpVIN2 expression is increased to maintain cold tolerance, then cold resistance improves, but sucrose content decreases due to enhanced sucrose degradation
Solution Approach 1:
The patent establishes a feedback regulation mechanism where PpPGIP1 protein inhibits PpVIN2 enzyme activity, creating a negative feedback loop that maintains sucrose levels while allowing cold-responsive VIN expression, thus balancing cold tolerance with sugar content preservation
Solution Approach 2:
The patent changes the enzymatic activity parameter of PpVIN2 through protein-protein interaction modulation, where PpPGIP1 binding reduces VIN catalytic activity, thereby controlling sucrose degradation rate while maintaining cold adaptability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method successfully inhibits VIN activity, maintaining sucrose levels as an antifreeze and reducing cold damage during storage and transportation, demonstrating a significant improvement in peach cold tolerance by confirming the protein-protein interaction between PpPGIP1 and PpVIN2 and achieving effective silencing of the target gene.
Implementation Method 1
The yeast two-hybrid system (Y2H) is a system where two proteins to be studied are cloned (fused) into a DNA binding domain (DNA-BD) and a transcription activation domain (AD) of a transcriptional activator (such as GAL4) of a yeast expression plasmid respectively to construct a fusion expression vector, and then the interaction between the two proteins is analyzed according to the expression product and the chromogenic reaction.
Implementation Method 2
The Agrobacterium transformation method is simple, fast, safe, and effective, and can lead to a high expression level. The successful transient silencing of PpPGIP1 in peaches has not been achieved. Therefore, the transient silencing of the target gene PpPGIP1 in peaches through Agrobacterium transformation is particularly important for the function analysis and application of the gene.
Implementation Method 3
extracting total RNA from a peach, and subjecting the total RNA to reverse transcription to obtain cDNA, which serves as a template
Implementation Method 4
Polymerase Chain Reaction (PCR) amplification: conducting PCR amplification to obtain a PpPGIP1 gene amplification product
Data Source
AI summary
The present invention discloses a Prunus persica polygalacturonase-inhibiting protein 1 (PpPGIP1) gene, and a cloning method and use thereof. The Prunus persica polygalacturonase-inhibiting protein 1 PpPGIP1 gene has a nucleotide sequence shown in SEQ ID NO: 1, and a protein encoded by the Prunus persica polygalacturonase-inhibiting protein 1 (PpPGIP1) gene has an amino acid sequence shown in SEQ ID NO: 2. The cloning method includes the following steps: (1) extracting total RNA from a peach, and subjecting the total RNA to reverse transcription to obtain cDNA, which serves as a template; (2) designing primers based on the PpPGIP1 gene sequence; and (3) Polymerase Chain Reaction (PCR) amplification: conducting PCR amplification to obtain a PpPGIP1 gene amplification product.