Functional characterization of CAMTA3 in calcium-mediated salicylic acid signaling under salinity stress

Date

2025-8-15

Author

Durmaz, Zeynep Burcu

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Salinity stress is a major abiotic factor affecting 7% of the total agricultural land and causing about $27 billion in annual losses worldwide. The activation of plant signaling pathways in response to salinity has been widely studied over the years. However, hormonal regulation of these pathways by signaling molecules is not fully understood. This thesis investigates the potential interaction between CAMTA3, a negative regulator of salicylic acid (SA) biosynthesis, and genes involved in the Salt Overly Sensitive (SOS) pathway in Arabidopsis thaliana by examining parameters such as chlorophyll content, root length, and endogenous SA levels under control, salt stress, exogenous SA application, and combined treatments. According to the thesis findings, camta3 mutants exhibited higher SA levels and increased tolerance responses to salinity under various conditions, while sos mutants displayed reduced growth under salinity. sos1-1camta3 and sos3-1camta3 mutants revealed epistatic and non-additive interactions, indicating partially overlapping pathways between CAMTA3 and SOS signaling in stress regulation. These results provide new insights into the crosstalk between SOS regulation and SA signaling, opening up new possibilities for developing salt-tolerant crops through targeting signaling molecules and network interactions.

Subject Keywords

Salinity stress, Salicylic acid, CAMTA3, SOS pathway, Arabidopsis thaliana

URI

https://hdl.handle.net/11511/115540

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Graduate School of Natural and Applied Sciences, Thesis