Early-Stage Infection-Specific Heterobasidion annosum (Fr.) Bref. Transcripts in H. annosum-Pinus sylvestris L....

Area of Science:

• Plant Pathology
• Molecular Biology
• Forest Science

Background:

• Heterobasidion annosum (H. annosum) is a significant pathogen affecting conifer species.
• Understanding early infection mechanisms is crucial for disease management in forestry.
• Previous studies highlighted the role of specific gene functions in Norway spruce-H. annosum interactions.

Purpose of the Study:

• To identify unique and enriched H. annosum transcripts during the early stages of Scots pine infection.
• To investigate the temporal expression patterns of H. annosum genes post-inoculation.
• To explore potential virulence factors, such as malic enzyme, in H. annosum pathogenesis.

Main Methods:

• Transcriptome analysis of stem-inoculated Scots pine saplings.
• Differential gene expression analysis comparing various time points post-inoculation.
• Bioinformatic analysis to identify H. annosum transcripts and their functions.

Main Results:

• 131 differentially expressed H. annosum genes (p ≤ 0.01) were identified at different infection stages.
• Genes involved in carbohydrate and lignin degradation, and lipid metabolism, showed significant roles in pathogenesis.
• Malic enzyme was identified as a potential H. annosum virulence gene.

Conclusions:

• Early-stage H. annosum infection involves complex gene expression related to host tissue degradation and metabolism.
• Malic enzyme warrants further investigation as a key factor in H. annosum virulence.
• Improvements in sequencing depth and bioinformatics for analyzing low-proportion transcripts are needed for future studies.