Temporal dynamics of genetic architecture governing leaf development in Populus
Peng Li1,2, Yuling He1,2, Liang Xiao1,2
1State Key Laboratory of Tree Genetics and Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, 100083, China.
The New Phytologist
|February 28, 2024
Summary
Understanding the dynamic genetic network of leaf development in Populus is crucial. This study reveals PtoGRF9 as a key regulator, modulating cell proliferation and activating downstream genes during leaf growth.
Area of Science:
- Plant Biology
- Genetics
- Molecular Biology
Background:
- Leaf development is a complex process involving intricate genetic regulation.
- The dynamic genetic network governing leaf development is not fully understood.
Purpose of the Study:
- To explore the temporal genetic architecture and regulatory network of leaf development in Populus.
- To identify key genes and pathways controlling leaf morphogenesis.
Main Methods:
- Utilized dynamic genome-wide association study (GWAS) and time-ordered gene co-expression network (TO-GCN) analyses.
- Employed gene manipulation techniques (overexpression and suppression) for functional validation.
- Integrated multi-omics data to construct temporal gene networks.
Main Results:
- Identified 42 time-specific and 18 consecutive genes involved in leaf development.
- Constructed eight TO-GCNs covering key developmental stages (cell proliferation, transition, expansion).
- Discovered PtoGRF9 as a critical regulator, influencing leaf development by modulating cell proliferation and interacting with PtoHB21 and PtoLD.
Conclusions:
- PtoGRF9 plays a pivotal role in Populus leaf development, primarily by regulating cell proliferation.
- The study elucidates a dynamic regulatory mechanism involving PtoGRF9, PtoHB21, and PtoLD during specific leaf developmental stages.
- Provides novel insights into the genetic underpinnings of plant leaf morphogenesis.
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