Combined analysis of the endophytic fungi and volatile oil content of different germplasms revealed the correlations between endophytic fungal abundances and agarwood production.

INTRODUCTION

Agarwood, a prized aromatic resin from , is formed as a defensive response to injury or fungal infection. However, the factors influencing its chemical composition remain poorly understood. This study aimed to explore the relationship between endophytic fungal communities and volatile oil content in ordinary-type and Qinan-type .

METHODS

Using high-throughput sequencing, we analyzed the fungal composition in both the healthy wood and agarwood layers of different germplasms. Additionally, gas chromatography-mass spectrometry (GC-MS) was employed to quantify the volatile oil content.

RESULTS

The results revealed that the fungal community composition in the agarwood layer differed between the two types of , with Fusarium, Hermatomyces, and Rhinocladiella linked to sesquiterpene production (r>0.8, p<0.01), while Microidium, Cladosporium, and Cephalotrichum were associated with chromone levels (r>0.8, p<0.01). Furthermore, the volatile oil content in Qinan-type agarwood was significantly higher than that in ordinary-type agarwood, with distinct chemical profiles observed in each germplasm.

DISCUSSION

These findings provide critical insights into the role of endophytic fungi in shaping agarwood's chemical composition and have practical implications for enhancing agarwood production in the industry. Consequently, this research has significant implications for the agarwood industry, as it enhances our understanding of how fungi influence resin quality and paves the way for improving the efficiency of agarwood induction, ultimately leading to higher-quality and more sustainable production.