Tissue-specific transcriptome profiles identify functional differences key to understanding whole plant response to...

Area of Science:

• Marine Botany
• Plant Physiology
• Genomics

Background:

• Seagrasses are vital primary producers and carbon sinks, yet their stress adaptation mechanisms at the tissue level remain unclear.
• Understanding phenotypic plasticity and adaptation in seagrasses is crucial for predicting ecosystem responses to environmental change.

Purpose of the Study:

• To generate baseline in situ transcriptomic profiles for different tissues (leaf, basal leaf meristem, root) of Posidonia australis.
• To investigate tissue-specific gene expression patterns across a salinity gradient.
• To identify key molecular mechanisms underlying seagrass adaptation to varying salinity levels.

Main Methods:

• RNA sequencing (RNA-seq) was used to generate transcriptome data from P. australis tissues.
• Samples were collected from four meadows across a salinity gradient in Shark Bay, Western Australia.
• Gene expression analysis and Gene Ontology (GO) enrichment analysis were performed.

Main Results:

• Significant differences in gene expression were observed between leaf, meristem, and root tissues, with higher variation in leaves.
• GO analysis revealed tissue-specific functions: photosynthesis in leaves, plant growth in meristems, and nutrient absorption in roots.
• Upregulation of salinity regulation processes was detected in leaf and meristem tissues from higher salinity environments.

Conclusions:

• Tissue-specific transcriptomic profiling provides insights into seagrass adaptation strategies.
• Leaf meristem tissue plays a significant role in whole-plant responses to environmental stressors like salinity.
• This study emphasizes the importance of considering meristematic tissues for a comprehensive understanding of seagrass resilience.