Genetic Resistance Mechanisms in Soybean Against Phytophthora sojae
Summary
Phytophthora root and stem rot caused by the oomycete Phytophthora sojae poses a major threat to global soybean production. Soybean plants deploy a spectrum of genetic resistance mechanisms to mitigate this disease, ranging from single-gene (vertical) resistance to polygenic (horizontal) resistance. Vertical resistance is primarily mediated by Rps (Resistance to Phytophthora sojae) genes, which encode nucleotide-binding site leucine-rich repeat (NBS-LRR) receptors. These intracellular sensors detect specific pathogen effectors and activate a rapid hypersensitive response and downstream defence pathways, including salicylic acid, jasmonic acid and ethylene signalling. Horizontal resistance arises from quantitative trait loci (QTL) that contribute to partial resistance, reducing disease severity and slowing pathogen evolution. Emerging studies have refined the genetic architecture of Rps clusters on chromosomes 3, 13 and 18, identified novel allelic variants from diverse germplasm, and elucidated transcriptional regulators that modulate defence gene expression. Integrating major Rps genes with QTL for partial resistance and understanding the interplay of hormonal and reactive oxygen species signalling underpin practical breeding strategies for durable resistance and global food security.
Research from Nature Portfolio
Recent analyses have revealed a temporal decline in the efficacy of widely deployed Rps genes, such as Rps1a, Rps1c and Rps1k, due to an increase in P. sojae pathotype diversity over the past three decades. A systematic global study of over 5 000 P. sojae isolates demonstrated that these classic resistance alleles have lost effectiveness in major soybean-growing regions, underscoring the urgency to introduce novel Rps sources, including Rps3a, Rps6 and Rps11, into cultivated lines. The work emphasises monitoring pathogen populations to inform strategic deployment of resistance genes and reduce the risk of widespread breakdown.
Genetic Resistance Mechanisms in Soybean Against Phytophthora sojae publication trend
The graph below shows the total number of articles in genetic resistance mechanisms in soybean against phytophthora sojae across all publications each year (not limited to Nature Index journals).
Technical terms
Rps gene: Resistance to Phytophthora sojae gene encoding a receptor that recognises specific pathogen effectors and triggers disease resistance.
Oomycete: A group of fungus-like organisms, including Phytophthora sojae, responsible for devastating root and stem rot in soybean.
NBS-LRR: Nucleotide-binding site leucine-rich repeat proteins that serve as intracellular immune receptors in plants.
Pathotype: A strain of a pathogen defined by its specific pattern of virulence on different host resistance genes.
Hypersensitive response: A rapid, localised cell death at infection sites that restricts pathogen spread.
References
- A global-temporal analysis on Phytophthora sojae resistance-gene efficacy. Nature Communications (2023).
- The EIN3 transcription factor GmEIL1 improves soybean resistance to Phytophthora sojae. Molecular Plant Pathology (2024).
- The MYB Transcription Factor GmMYB78 Negatively Regulates Phytophthora sojae Resistance in Soybean. International Journal of Molecular Sciences (2024).
- Soybean Variety Saedanbaek Confers a New Resistance Allele to Phytophthora sojae. Plants (2023).
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