Abstract
Main conclusion
PdeHCA2 regulates the transition from primary to secondary growth, plant architecture, and affects photosynthesis by targeting PdeBRC1 and controlling the anatomy of the mesophyll, and intercellular space, respectively.
Abstract
Branching, secondary growth, and photosynthesis are vital developmental processes of woody plants that determine plant architecture and timber yield. However, the mechanisms underlying these processes are unknown. Here, we report that the Populus transcription factor High Cambium Activity 2 (PdeHCA2) plays a role in the transition from primary to secondary growth, vascular development, and branching. In Populus, PdeHCA2 is expressed in undifferentiated provascular cells during primary growth, in phloem cells during secondary growth, and in leaf veins, which is different from the expression pattern of its homolog in Arabidopsis. Overexpression of PdeHCA2 has pleiotropic effects on shoot and leaf development; overexpression lines showed delayed growth of shoots and leaves, reduced photosynthesis, and abnormal shoot branching. In addition, auxin-, cytokinin-, and photosynthesis-related genes were differentially regulated in these lines. Electrophoretic mobility shift assays and transcriptome analysis indicated that PdeHCA2 directly up-regulates the expression of BRANCHED1 and the MADS-box gene PdeAGL9, which regulate plant architecture, by binding to cis-elements in the promoters of these genes. Taken together, our findings suggest that HCA2 regulates several processes in woody plants including vascular development, photosynthesis, and branching by affecting the proliferation and differentiation of parenchyma cells.
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Abbreviations
- Ci:
-
Intracellular carbon dioxide concentration
- CK:
-
Cytokinin
- DEG:
-
Differentially expressed gene
- GO:
-
Gene ontology
- HCA :
-
High cambial activity
- IN:
-
Internode
- LPI:
-
Leaf plastochron index
- Pn:
-
Net photosynthesis rate
- SAM:
-
Shoot apical meristem
- TF:
-
Transcription factor
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Acknowledgements
This work is supported by “The State Key Laboratory of Subtropical Silviculture” (Grant No. KF201903). We thank Dr. Melissa Lehti-Shiu (Lehti Life Science Editing) for proofreading the manuscript. This research was supported by the excellent platform of the Institute of Botany, The Chinese Academy of Sciences.
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Supplementary file2 Annotation of differentially expressed genes from the shoot apex—IN3 stem RNA-sequencing data (XLS 497 KB)
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Supplementary file4 GO classification of the differentially expressed genes from the leaf and shoot apex—IN3 RNA-sequencing data (XLSX 51 KB)
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Zhao, BG., Li, G., Wang, YF. et al. PdeHCA2 affects biomass in Populus by regulating plant architecture, the transition from primary to secondary growth, and photosynthesis. Planta 255, 101 (2022). https://doi.org/10.1007/s00425-022-03883-6
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DOI: https://doi.org/10.1007/s00425-022-03883-6