Molecular interaction of charcoal rot pathogenesis in soybean: a complex interaction

Area of Science:

• * Plant pathology and genetics.
• * Molecular plant-pathogen interactions.
• * Crop improvement strategies.

Background:

• * Charcoal rot (CR), caused by Macrophomina phaseolina (Mp), is a significant soybean disease exacerbated by climate change.
• * Mp is a hemibiotroph that invades soybean roots, employing enzymes and surface receptors to overcome host defenses.
• * Plant immune responses involve microbe-associated molecular patterns (MAMPs) like β-glucan, triggering defense genes and signaling pathways.

Purpose of the Study:

• * To review and functionally link Macrophomina phaseolina pathogenicity mechanisms with soybean's defense responses.
• * To explore the genetic basis of quantitative resistance to charcoal rot in soybean.
• * To identify strategies for enhancing soybean's natural resistance to this disease.

Main Methods:

• * Comprehensive literature review of M. phaseolina pathogenicity and soybean defense mechanisms.
• * Analysis of identified quantitative trait loci (QTLs) associated with CR resistance.
• * Synthesis of information on plant immune signaling, hormone pathways, and phytoalexin production.

Main Results:

• * M. phaseolina utilizes surface receptors and enzymes for host tissue colonization.
• * Soybean immune responses are activated by MAMPs, involving kinase receptors and pathogenesis-related genes.
• * Quantitative resistance to CR is complex, with limited QTLs identified to date.

Conclusions:

• * Elucidating the functional links between M. phaseolina and soybean is vital for understanding CR resistance.
• * Knowledge of resistance mechanisms can guide breeding programs for improved soybean cultivars.
• * Targeted gene introgression can enhance soybean's genetic resistance to charcoal rot.