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Induction and Validation of Cellular Senescence in Primary Human Cells

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Published on: June 20, 2018

Evolution of plant senescence.

Howard Thomas¹, Lin Huang, Mike Young

¹IBERS, Aberystwyth University, Ceredigion, SY23 3DA, UK. hot@aber.ac.uk

BMC Evolutionary Biology

|July 16, 2009

Summary

Plant senescence evolved over time, with ancient core processes like light energy turnover becoming more complex with new biochemical and adaptive systems. This study traces the evolutionary origins of senescence-related genes in plants.

Area of Science:

Plant Biology
Evolutionary Biology
Genomics

Background:

Senescence is a crucial process in flowering plants, with similar mechanisms observed in other plant groups, algae, and prokaryotes.
An increasing number of genes are being identified for their roles in regulating plant senescence.
Genome databases have expanded significantly, providing vast resources for evolutionary studies.

Purpose of the Study:

To investigate the evolutionary origins of angiosperm senescence.
To analyze the distribution and expression of senescence-related genes across various plant and microbial taxa.

Main Methods:

Phylogenetic analyses of protein sequences from senescence-related genes.
Inference of evolutionary timelines based on homologous sequence distribution.

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Profiling of senescence-related genes in Arabidopsis for coexpression patterns.

Main Results:

The turnover of the light energy transduction apparatus represents the most ancient aspect of senescence.
Phenylpropanoid metabolism and transcription factor-mediated integration of senescence are recent land plant innovations.
Coexpression analysis revealed distinct groupings for carotenoid metabolism, anthocyanin/flavonoid pathways, and chlorophyll catabolism.

Conclusions:

Phylogenetic and expression data provide a framework for understanding the evolution of plant senescence.
Ancient core senescence processes were progressively augmented with biochemical, cellular, and adaptive systems during plant evolution.