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Relating Stomatal Conductance to Leaf Functional Traits
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Sulfate is Incorporated into Cysteine to Trigger ABA Production and Stomatal Closure
Sundas Batool1, Veli Vural Uslu1, Hala Rajab1
1Centre for Organismal Studies, Heidelberg University, 69120 Heidelberg, Germany.
The Plant Cell
|December 13, 2018
Summary
Plants use sulfate to close stomata during drought. Sulfate triggers reactive oxygen species (ROS) and abscisic acid (ABA) production in guard cells, a key water-saving mechanism.
Area of Science:
- Plant Physiology
- Plant Molecular Biology
- Biochemistry
Background:
- Plants close stomata to conserve water when soil moisture is low.
- Soil drying promotes root-to-shoot sulfate transport, and sulfate has been shown to induce stomatal closure.
Purpose of the Study:
- To elucidate the signaling pathway underlying sulfate-induced stomatal closure in Arabidopsis.
- To investigate the role of reactive oxygen species (ROS) and abscisic acid (ABA) in this process.
Main Methods:
- Utilized Arabidopsis mutants defective in ABA synthesis and signaling (aba3-1, abi2-1).
- Employed ABA reporter lines (ABAleon2.1, ProRAB18:GFP) and quantified ABA marker gene expression.
- Assessed the necessity of cysteine (Cys) synthesis for sulfate-induced stomatal closure.
Main Results:
- Sulfate activates NADPH oxidases in guard cells, leading to ROS production essential for stomatal closure.
- Sulfate-induced ROS production and stomatal closure are dependent on ABA synthesis and signaling.
- Sulfate assimilation into Cys is required for sulfate-induced stomatal closure, and Cys feeding enhances ABA biosynthesis gene expression.
Conclusions:
- Sulfate is assimilated into Cys, which tunes ABA biosynthesis in leaves, promoting stomatal closure.
- This sulfate-mediated pathway is crucial for the physiological response to water limitation in plants.
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