CcRpp2 Resistance Genes for Durable Asian Soybean Rust Defense
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Solution Overview
Problem
Current soybean cultivars lack durable resistance to Asian soybean rust (ASR) caused by Phakopsora pachyrhizi, with existing methods relying on isolate-specific genes and fungicides, and there is a need for stable genetic resistance to enhance crop yield.
Innovation Solution
Introduction of legume-derived CcRpp2-R1 and CcRpp2-R3 resistance genes into soybean plants, which encode polypeptides conferring broad-spectrum resistance through heterologous expression, utilizing recombinant DNA constructs with heterologous regulatory elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolate-specific resistance genes are used in soybean cultivars, then resistance to specific ASR strains is achieved, but durability and broad-spectrum resistance are compromised
Solution Approach 1:
The patent introduces binary polynucleotides encoding R1 and R3 domains that can recognize multiple different effectors from various ASR strains. This multi-functional resistance mechanism allows a single genetic construct to provide broad-spectrum protection against diverse pathogen strains, resolving the contradiction between specificity and broad-spectrum resistance.
Solution Approach 2:
The invention combines two distinct resistance domains (R1 and R3) into a single binary polynucleotide construct. This composite genetic structure integrates the functional advantages of both domains, creating a synergistic resistance mechanism that provides both durability and broad-spectrum protection simultaneously.
2Object-affected harmful factors
If fungicides are used to control ASR, then disease symptoms are managed, but yield loss and economic costs persist
Solution Approach 1:
The patent enables soybean plants to express their own resistance mechanisms through the binary polynucleotide system. The transformed plants autonomously produce R1 and R3 domain proteins that recognize and respond to pathogen effectors, providing self-protecting capability that reduces dependence on external fungicide applications and minimizes yield loss.
Solution Approach 2:
The resistance genes are introduced into the plant genome in advance, establishing a proactive defense system before pathogen infection occurs. This preliminary genetic empowerment allows the plant to mount rapid immune responses upon pathogen encounter, preventing disease development and protecting yield potential.
3Stability of the object's composition
If traditional breeding methods are used to improve ASR resistance, then genetic diversity is maintained, but resistance development is slow and limited
Solution Approach 1:
The patent fundamentally changes the approach to resistance development by moving from conventional breeding to genetic transformation. This parameter change in the methodology allows for the precise introduction of binary polynucleotides with defined R1 and R3 domains, achieving rapid and reliable resistance development while maintaining genetic stability through controlled transformation events.
Data Source
AI summary
Disclosed herein are compositions and methods for improving or enhancing pathogen resistance in legume plants. Compositions comprising polypeptides encoded by the CcRpp2-R1 and CcRpp2-R3 polynucleotides disclosed herein are useful in improving resistance in legumes to Asian Soybean Rust (ASR). Methods of using CcRpp2-R1 and CcRpp2-R3 genes to make transgenic ASR-resistant legume plants are also disclosed.