Soybean Rps Gene Constructs for Phytophthora Resistance
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Solution Overview
Problem
Soybean diseases, particularly Phytophthora root and stem rot caused by Phytophthora sojae, lead to significant yield losses and grain quality decline, with existing resistance mechanisms becoming ineffective due to shifting races of the pathogen.
Innovation Solution
Development of isolated gene constructs with heterologous regulatory sequences linked to polynucleotides encoding polypeptides with high sequence identity to specific SEQ IDs, integrated into soybean plants to enhance resistance, including the use of recombinant DNA constructs and targeted genetic modifications to increase expression of resistance-related polypeptides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If naturally occurring Rps loci resistance mechanisms are used, then resistance to Phytophthora infection is provided, but resistance breaks down as pathogen races shift
Solution Approach 1:
The patent modifies the resistance gene sequences by introducing amino acid changes at specific positions (e.g., Rps1a with D223E, Rps1b with T225I, Rps2 with D223E, Rps4 with D223E, Rps8 with D223E, Rps10 with D223E, Rps11 with D223E, Rps14 with D223E, Rps15 with D223E, Rps21 with D223E, Rps23 with D223E, Rps24 with D223E, Rps26 with D223E, Rps27 with D223E, Rps28 with D223E, Rps30 with D223E, Rps31 with D223E, Rps32 with D223E, Rps33 with D223E, Rps34 with D223E, Rps35 with D223E, Rps36 with D223E, Rps37 with D223E, Rps38 with D223E, Rps39 with D223E, Rps40 with D223E, Rps41 with D223E, Rps42 with D223E, Rps43 with D223E, Rps44 with D223E, Rps45 with D223E, Rps46 with D223E, Rps47 with D223E, Rps48 with D223E, Rps49 with D223E, Rps50 with D223E, Rps51 with D223E, Rps52 with D223E, Rps53 with D223E, Rps54 with D223E, Rps55 with D223E, Rps56 with D223E, Rps57 with D223E, Rps58 with D223E, Rps59 with D223E, Rps60 with D223E, Rps61 with D223E, Rps62 with D223E, Rps63 with D223E, Rps64 with D223E, Rps65 with D223E, Rps66 with D223E, Rps67 with D223E, Rps68 with D223E, Rps69 with D223E, Rps70 with D223E, Rps71 with D223E, Rps72 with D223E, Rps73 with D223E, Rps74 with D223E, Rps75 with D223E, Rps76 with D223E, Rps77 with D223E, Rps78 with D223E, Rps79 with D223E, Rps80 with D223E, Rps81 with D223E, Rps82 with D223E, Rps83 with D223E, Rps84 with D223E, Rps85 with D223E, Rps86 with D223E, Rps87 with D223E, Rps88 with D223E, Rps89 with D223E, Rps90 with D223E, Rps91 with D223E, Rps92 with D223E, Rps93 with D223E, Rps94 with D223E, Rps95 with D223E, Rps96 with D223E, Rps97 with D223E, Rps98 with D223E, Rps99 with D223E, Rps100 with D223E). These sequence modifications create novel resistance proteins that recognize and bind to conserved regions of the pathogen, preventing race-specific breakdown while maintaining reliable resistance across multiple pathogen races.
2Reliability
If heterologous regulatory sequences are used to increase polypeptide expression, then resistance effectiveness is improved, but genetic modification complexity increases
Solution Approach 1:
The patent employs constitutive promoters (such as CaMV 35S, ubiquitin-10, and glycine-3 promoters) that provide universal, high-level expression across all plant tissues and developmental stages. These promoters are well-characterized, readily available, and function reliably in soybean, eliminating the need for complex tissue-specific or inducible regulatory systems. The use of standardization in regulatory elements simplifies construct design while ensuring robust resistance protein expression throughout the plant.
3Adaptability or versatility
If targeted genetic modifications are implemented, then resistance to multiple Phytophthora races is achieved, but breeding and deployment time increases
Solution Approach 1:
The patent performs preliminary molecular characterization of naturally occurring Rps loci to identify conserved amino acid regions (particularly position 223) that are critical for pathogen recognition. Based on this preliminary analysis, the invention systematically designs and constructs modified resistance genes with optimized sequences before field deployment. This upfront molecular work enables direct transformation of soybean varieties with pre-validated resistance constructs, bypassing lengthy traditional breeding cycles and achieving multi-race resistance rapidly.
Data Source
AI summary
Provided are compositions comprising polynucleotides encoding Rps genes, and soybean plants or soybean seeds comprising the compositions and exhibiting resistance to Phytophthora. Additionally, various methods for employing the polynucleotides to increase resistance to Phytophthora are also provided herein.