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Mutations in the Arabidopsis Lst8 and Raptor genes encoding partners of the TOR complex, or inhibition of TOR
Alena Kravchenko1, Sylvie Citerne2, Isabelle Jéhanno2
1L.N. Gumilyov Eurasian National University, 2 Satpayev Str, 010008, Astana, Kazakhstan; IJPB, UMR 1318 INRA-AgroParisTech, ERL CNRS 3559, Saclay Plant Sciences, F-78026, Versailles, France.
The Target of Rapamycin (TOR) kinase influences abscisic acid (ABA) levels in plants. Inhibiting TOR signaling decreases ABA accumulation, affecting plant growth and stress responses.
Area of Science:
- Plant biology
- Molecular signaling
- Hormone metabolism
Background:
- The Target of Rapamycin (TOR) kinase is a crucial regulator of plant growth, development, and response to environmental cues.
- TOR signaling modulates cellular metabolism and translation processes.
Purpose of the Study:
- To investigate the role of TOR kinase in the regulation of abscisic acid (ABA) metabolism in Arabidopsis.
- To determine how TOR inhibition affects ABA hormone levels and plant sensitivity to ABA.
Main Methods:
- Analysis of ABA levels in TOR signaling mutants (Lst8-1, Raptor3g) and wild-type (WT) Arabidopsis treated with a TOR inhibitor (AZD-8055).
- Assessment of plant growth and germination responses to exogenous ABA.
- Quantitative analysis of transcript levels for key genes involved in ABA biosynthesis (ZEP, NCED3, AAO3) and catabolism (CYP707A2).
Main Results:
- TOR kinase inhibition or mutation led to a significant decrease in endogenous ABA levels.
- Mutant and inhibited plants exhibited increased sensitivity to exogenous ABA, indicating altered ABA signaling or homeostasis.
- Reduced ABA accumulation correlated with downregulated expression of ABA biosynthetic genes and upregulated expression of ABA catabolic genes.
Conclusions:
- The TOR signaling pathway plays a significant role in regulating ABA accumulation in Arabidopsis.
- TOR kinase activity influences the balance between ABA biosynthesis and catabolism.
- These findings reveal a novel link between nutrient signaling (via TOR) and stress hormone regulation (ABA).
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