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Transcriptomic analysis of purple leaf determination in birch.

Lin Lin¹, Huaizhi Mu, Jing Jiang

¹State Key Laboratory of Forest Genetics and Tree Breeding, Northeast Forestry University, 26, Hexing Road, Harbin 150040, China.

|June 5, 2013

Summary

Betula pendula 'Purple Rain' exhibits darker purple leaves due to elevated anthocyanidin levels. Transcriptome analysis revealed significant gene expression changes related to anthocyanidin synthesis and regulation, explaining the unique phenotype.

Keywords:

6-benzylamino purine 6BA Anthocyanin Betula pendula COG CTAB Cluster of Orthologous Groups of proteins DEUs Differential expression of unigenes FDR False discovery rate GA3 GO Gene ontology Gibberellin A3 Hexadecyltrimethy Ammonium Bromide KEGG Kyoto Encyclopedia of Genes and Genomes Leaf color NGS Next generation sequencing RPKM Reads per kb per million reads Transcriptome WPM Woody plant medium

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Area of Science:

Plant Science
Molecular Biology
Genetics

Background:

Betula pendula 'Purple Rain' is a cultivar known for its distinctive dark purple foliage.
Understanding the genetic and biochemical basis of this coloration is crucial for plant breeding and understanding pigment pathways.

Purpose of the Study:

To investigate the molecular mechanisms underlying the purple coloration in Betula pendula 'Purple Rain'.
To compare anthocyanidin levels and analyze gene expression patterns between 'Purple Rain' and standard Betula pendula.

Main Methods:

Quantification of anthocyanidin levels.
Transcriptome analysis using high-throughput sequencing.
Differential gene expression analysis.

Main Results:

Betula pendula 'Purple Rain' showed significantly higher anthocyanidin levels compared to the standard variety.
Transcriptome analysis identified substantial changes in gene expression, with 2467 unigenes upregulated and 2299 unigenes downregulated in 'Purple Rain'.
Alterations in anthocyanidin synthesis and transcriptional regulation pathways were observed in 'Purple Rain'.

Conclusions:

The unique purple phenotype of Betula pendula 'Purple Rain' is associated with increased anthocyanidin accumulation.
Gene expression profiling provides molecular insights into the regulatory networks controlling pigment production in this cultivar.
These findings contribute to understanding the genetic basis of plant coloration and can inform future breeding strategies.