Transcriptome sequencing-based analysis of primary vein development in Betula pendula 'Dalecarlica'.

Area of Science:

• Plant Biology
• Molecular Biology
• Genetics

Background:

• Vascular tissue development is crucial for plant performance, but primary vein formation in birch remains poorly understood.
• Understanding birch primary vein development is essential for insights into vascular morphogenesis in woody plants.

Purpose of the Study:

• To elucidate the biological processes during primary vein development in Betula pendula 'Dalecarlica'.
• To identify candidate genes involved in primary vein formation and vascular morphogenesis.

Main Methods:

• Anatomical observation of primary veins across different developmental stages.
• Transcriptome analysis to identify differentially expressed genes (DEGs) and developmental stages.
• Gene Ontology (GO) enrichment analysis and weighted gene co-expression network analysis (WGCNA).

Main Results:

• Primary vein development was divided into three stages (I, II, III) consistent with anatomical and transcriptomic data.
• DEGs were enriched in cell division, cell cycle, and phosphorylation pathways; lignin biosynthesis was activated.
• A cytochrome P450 84A family gene (BpF5H1) was identified as a candidate regulator, with a proposed electron transfer pathway.

Conclusions:

• Biological processes like cell division, cell cycle, and phosphorylation play roles in birch primary vein development.
• The identified BpF5H1 gene and associated pathway offer valuable insights into vascular morphogenesis in woody plants.