Serendipita Fungi Modulate the Switchgrass Root Transcriptome to Circumvent Host Defenses and Establish a Symbiotic...

Area of Science:

• Plant-microbe interactions
• Mycology
• Bioenergy crops

Background:

• Serendipitaceae fungi form root symbioses with diverse plant types.
• Switchgrass is a key bioenergy crop for cellulosic ethanol production.
• Understanding plant responses to Serendipita is crucial for sustainable agriculture.

Purpose of the Study:

• Investigate switchgrass root responses to Serendipita spp. colonization.
• Characterize the switchgrass root transcriptome during symbiosis.
• Compare responses to native and related Serendipita strains.

Main Methods:

• In vitro study of switchgrass and Serendipita spp. (S. bescii, S. vermifera).
• Transcriptome analysis of switchgrass roots at different symbiosis stages.
• Monitoring of root morphology and phytohormone gene expression.

Main Results:

• Switchgrass perceives fungi before contact, activating defense and resistance genes.
• Host defense is later suppressed, and carbohydrate metabolism is adjusted.
• Root hair density and surface area increase prior to fungal contact.
• Phytohormone metabolism genes (gibberellin, jasmonic acid, salicylic acid) are activated.
• Both fungal strains elicit similar plant gene expression patterns.

Conclusions:

• Switchgrass exhibits a conserved, staged response to Serendipita colonization.
• Early defense activation is followed by accommodation of the symbiont.
• These findings support the integration of Serendipita for sustainable agriculture.