- Researchers discover a calcium sensing module that negatively regulates drought stress in plants.
- The study reveals that mutants cbl1/9 and cipk1 show hypersensitivity to the stress hormone Abscisic acid (ABA) and are more resilient to drought.
- CIPK1 interacts with and phosphorylates specific ABA receptors, affecting their activities under normal conditions.
- The study provides new insights into a previously unknown negative regulatory mechanism in the ABA signaling pathway.
- The findings expand our understanding of the relationship between calcium signaling and ABA signaling in plants.
A recent study by You et al., published in 2023, delves into the complex relationship between the stress hormone Abscisic acid (ABA) and calcium signaling in plants. The research focuses on understanding how these elements interact to regulate plant responses to environmental stresses like drought.
The Calcium Sensing Module
The study introduces a calcium sensing module that negatively regulates drought stress by modulating ABA receptor PYLs. This module involves mutants cbl1/9 and cipk1, which exhibit hypersensitivity to ABA and increased resilience to drought conditions.
The Role of CIPK1
CIPK1 is shown to interact with and phosphorylate 7 of the 14 ABA receptors at an evolutionarily conserved site. This interaction suppresses the activities of these receptors and promotes PP2C activities under normal conditions.
ABA Signaling and Drought Stress
Under drought stress, ABA interferes with the phosphorylation of PYLs by CIPK1. This allows the plants to better respond to ABA signaling and survive in unfavorable environmental conditions. The study thus uncovers a previously unknown negative regulatory mechanism in the ABA signaling pathway.
Expanding Our Understanding
The findings of this study significantly expand our knowledge about the interplay between calcium signaling and ABA signaling. This could have far-reaching implications for developing plants that are more resilient to environmental stresses like drought.