A cross-species co-functional gene network underlying leaf senescence

Area of Science:

• Plant Biology
• Molecular Biology
• Genetics

Background:

• Leaf senescence involves complex transcriptional and translational regulation.
• Understanding conserved molecular mechanisms across species is crucial but remains unclear.
• Current methods struggle to build large-scale regulatory networks for intricate processes like senescence.

Purpose of the Study:

• To identify conserved genes and regulatory networks underlying leaf senescence across diverse plant species.
• To investigate the role of the mitochondrial unfolded protein response (UPR^mt) in leaf senescence.
• To construct a cross-species co-functional gene network for leaf senescence.

Main Methods:

• Comparative genomics analyzing evolutionary relationships and gene expression patterns.
• Multi-omics data integration from over 10,000 samples across 85 projects.
• Construction of a leaf senescence-associated co-functional gene network.

Main Results:

• Identified conserved genes involved in leaf senescence in tomato, rice, and Arabidopsis.
• Revealed that the genetic basis of leaf senescence is largely conserved across species.
• Established the mitochondrial unfolded protein response (UPR^mt) as a central process maintaining mitostasis during senescence, involving conserved factors like NAC13 and ornithine.

Conclusions:

• Leaf senescence mechanisms are significantly conserved across monocot and eudicot plants.
• UPR^mt plays a pivotal, conserved role in regulating leaf senescence by maintaining mitostasis.
• The study provides a comprehensive co-functional gene network offering new insights into conserved senescence pathways.