AI Article Synopsis
- Plants adjust their growth and development based on environmental changes, such as salt stress, which negatively impacts growth and yield.
- The study found that the growth of root hairs in salt-stressed seedlings is regulated by a specific module involving SOS2, RhoGDI1, and ROP2.
- Activation of the SOS2 kinase by salt stress leads to the phosphorylation and decreased stability of RhoGDI1, affecting the localization of ROP2 and enhancing root hair growth, which is essential for plant health under salt conditions.
Article Abstract
To ensure optimal growth, plants actively regulate their growth and development based on environmental changes. Among these, salt stress significantly influences growth and yield. In this study, we demonstrate that the growth of root hairs of salt-stressed seedlings is regulated by the SALT OVERLY SENSITIVE 2 (SOS2)-GUANOSINE NUCLEOTIDE DIPHOSPHATE DISSOCIATION INHIBITOR 1 (RhoGDI1)-Rho GTPASE OF PLANTS 2 (ROP2) module. We show here that the kinase SOS2 is activated by salt stress and subsequently phosphorylates RhoGDI1, a root hair regulator, thereby decreasing its stability. This change in RhoGDI1 abundance resulted in a fine-tuning of polar localization of ROP2 and root hair initiation followed by polar growth, demonstrating how SOS2-regulated root hair development is critical for plant growth under salt stress. Our results reveal how a tissue-specific response to salt stress balances the relationship of salt resistance and basic growth.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10450838 | PMC |
| http://dx.doi.org/10.1073/pnas.2217957120 | DOI Listing |
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