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A global-temporal analysis on Phytophthora sojae resistance-gene efficacy
Austin G McCoy1, Richard R Belanger2, Carl A Bradley3
1Michigan State University, East Lansing, MI, USA. mccoyaus@msu.edu.
Nature Communications
|September 27, 2023
Summary
Soybean Phytophthora sojae resistance (Rps) genes are losing effectiveness due to increasing pathogen diversity. New resistance sources are crucial for managing Phytophthora stem and root rot (PRR) globally.
Area of Science:
- Plant Pathology
- Genetics
- Agricultural Science
Background:
- Plant disease resistance genes are vital for global food security.
- Soybean Rps genes combat Phytophthora sojae, a pathogen causing worldwide Phytophthora stem and root rot (PRR).
Approach:
- Systematic review of 5121 Phytophthora sojae isolates from 29 surveys (1990-2019) across the US, Argentina, Canada, and China.
- Analysis of temporal changes in P. sojae pathotype complexity, diversity, and Rps gene efficacy.
Key Points:
- Significant increase in P. sojae pathotype diversity observed over time.
- Widely deployed Rps1a, Rps1c, and Rps1k genes show reduced efficacy against PRR in major agricultural regions.
- Loss of efficacy in Rps genes necessitates new resistance strategies.
Conclusions:
- Current Rps gene deployment is insufficient for effective PRR management.
- Introduction of novel resistance genes like Rps3a, Rps6, or Rps11 into commercial soybean cultivars is essential.
- Proactive development of new resistance sources is critical for sustainable soybean production.
