[Allelopathy of root exudates from two genotypes soybeans on root pathogenic fungi]

Area of Science:

• Plant Pathology
• Agricultural Chemistry

Context:

• Root rot diseases pose a significant threat to soybean (Glycine max) cultivation.
• Understanding the allelopathic interactions between soybean root exudates and soil-borne pathogens is crucial for developing sustainable disease management strategies.

Purpose:

• To investigate the allelopathic effects of water-soluble carbohydrates, amino acids, and organic acids in the root exudates of two soybean genotypes (9536 and Jilin 30) on key root rot pathogenic fungi.
• To determine the differential responses of pathogenic fungi (Fusarium oxysporum, Fusarium semitectum, and Gliocladium roseum) to varying concentrations and components of soybean root exudates.

Summary:

• Water-soluble carbohydrates in soybean root exudates exhibited dual effects, promoting fungal growth at low concentrations and inhibiting it at high concentrations, with no significant impact on Gliocladium roseum.
• Water-soluble amino acids from genotype 9536 inhibited all tested fungi, whereas those from Jilin 30 generally promoted their growth, indicating genotype-specific allelopathic potential.
• Organic acids from both soybean genotypes significantly inhibited the growth of Fusarium oxysporum, Fusarium semitectum, and Gliocladium roseum, highlighting their consistent antifungal activity.

Impact:

• The findings reveal complex interactions between soybean root exudates and root rot pathogens, influenced by the concentration and chemical composition of exudates.
• Demonstrates that different soybean genotypes possess distinct allelopathic capabilities against pathogenic fungi, offering potential for breeding programs aimed at enhancing natural disease resistance in soybeans.