Transcriptome and proteome analysis of Eucalyptus infected with Calonectria pseudoreteaudii

Area of Science:

• Plant Pathology
• Molecular Biology
• Biochemistry

Background:

• Cylindrocladium leaf blight poses a significant threat to Eucalyptus plantations.
• Understanding the defense mechanisms of resistant Eucalyptus cultivars is crucial for disease management.
• Limited knowledge exists regarding the molecular basis of Eucalyptus resistance to this blight.

Purpose of the Study:

• To investigate the transcriptome and proteome of Eucalyptus leaves in response to Calonectria pseudoreteaudii infection.
• To identify key genes and proteins involved in the defense response of Eucalyptus.
• To elucidate the molecular mechanisms underlying Eucalyptus resistance to Cylindrocladium leaf blight.

Main Methods:

• RNA-sequencing (RNA-seq) was employed to analyze gene expression changes at 12 and 24 hours post-inoculation.
• Quantitative real-time PCR (qRT-PCR) was used to validate transcriptional changes of selected genes.
• Isobaric tag for relative and absolute quantitation (iTRAQ) was utilized for proteomic analysis.

Main Results:

• Over 8500 differentially expressed genes and 3680 proteins were identified.
• Activation of the shikimate/phenylpropanoid pathway, terpenoid biosynthesis, and signaling pathways (jasmonic acid, sugar) was observed.
• Up-regulation of defense-related proteins like WRKY33 and PR proteins was detected, while photosynthesis and metabolism were impaired.

Conclusions:

• This study provides the first comprehensive transcriptomic and proteomic analysis of Eucalyptus in response to Calonectria sp. infection.
• Identified 130 proteins and genes involved in various metabolic and signaling pathways crucial for Eucalyptus defense.
• Findings facilitate the identification of novel defense-related genes and offer insights into Eucalyptus's resistance strategies.