Endogenous cAMP elevation in Brassica napus causes changes in phytohormone levels
Tianming Li1,2,3, Wenjing Jia1,2, Song Peng1,2
1School of Agricultural Sciences, Zhengzhou University, Zhengzhou, Henan, China.
Plant Signaling & Behavior
|February 5, 2024
Summary
Cyclic adenosine monophosphate (cAMP) signaling in plants impacts hormone levels and growth. Overexpressing adenylate cyclase in plants revealed cAMP
Area of Science:
- Plant molecular biology
- Plant physiology
- Second messenger signaling
Background:
- Cyclic adenosine 3',5'-monophosphate (cAMP) signaling roles are poorly understood in higher plants.
- Plant adenylate cyclases (AC) are often multifunctional, complicating cAMP role elucidation.
- Native cAMP levels are low and transient in plants compared to animals.
Purpose of the Study:
- To investigate the regulatory role of cAMP signaling in higher plants.
- To create a genetic model for manipulating cAMP levels in plants.
- To understand how elevated cAMP affects plant growth and hormone signaling.
Main Methods:
- Development of transgenic rapeseed (Brassica napus L.) overexpressing an inducible plant-origin AC.
- Analysis of phytohormone levels (IAA, JA, ABA, SA) in transgenic plants.
- Gene expression analysis (TAA1, CYP83B1, PR4, KIN2) and phenotypic characterization.
- Identification and enrichment analysis of cAMP-responsive genes (CRGs).
Main Results:
- Overexpression of soluble AC activity significantly impacted IAA and stress phytohormone levels.
- Acute AC induction led to IAA overaccumulation and upregulation of key biosynthesis genes.
- Transgenic plants exhibited overgrowth phenotypes and precocious seed development.
- 1465 cAMP-responsive genes (CRGs) were identified, enriched in hormone signaling and stress response pathways.
Conclusions:
- Elevated cAMP signaling influences phytohormone homeostasis and signaling pathways in plants.
- cAMP modulation significantly affects plant growth, development, and stress responses.
- cAMP signaling is proposed to be critical for coordinating growth and development in higher plants.
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