Getting by With a Little Help From Fungal Friends: Seed-Associated Endophytes Contribute to Seed Defense Against...

Area of Science:

• Ecology
• Mycology
• Plant Pathology

Background:

• Soil-borne fungal pathogens cause significant seed mortality in tropical forests.
• Seed-associated fungi may offer protection, especially for seeds with limited defenses.
• Understanding these interactions is crucial for tropical forest regeneration.

Purpose of the Study:

• To investigate microbially mediated seed defense in two tropical fig species.
• To determine if seed-associated endophytes protect against pathogenic fungi.
• To compare susceptibility to soil-borne fungi between free-standing and hemi-epiphytic fig species.

Main Methods:

• Inoculated fig seeds with fungal isolates before and after soil exposure.
• Classified fungal effects as endophytic or pathogenic.
• Tested pre-treatment with endophytes against subsequent pathogen exposure.

Main Results:

• Fungi from seeds prior to soil exposure did not impact germination.
• Soil-borne fungi were often pathogenic, particularly for hemi-epiphytic figs.
• Endophyte pre-treatment improved seed survival against pathogens, varying by species.

Conclusions:

• Seed-associated endophytes offer a plausible defense mechanism against fungal pathogens.
• Dynamic seed-fungal interactions can enhance seed survival in tropical forests.
• These findings have implications for maintaining tree populations and diversity.