AI Article Synopsis
- Myrosinase proteins TGG1 and TGG2 are prevalent in the guard cells of Arabidopsis plants, and their roles in stomatal closure have been studied through various mutant strains.
- Experiments showed that while wild type and single mutants (tgg1-3, tgg2-1) responded to abscisic acid (ABA) and methyl jasmonate (MeJA) by closing their stomata, the double mutant (tgg1-3 tgg2-1) failed to do so.
- The study suggests a model where TGG1 and TGG2 work together, functioning after reactive oxygen species production and before calcium elevation in the signaling pathways triggered by ABA
Article Abstract
Thioglucoside glucohydrolase (myrosinase), TGG1, is a strikingly abundant protein in Arabidopsis guard cells. We investigated responses of tgg1-3, tgg2-1 and tgg1-3 tgg2-1 mutants to abscisic acid (ABA) and methyl jasmonate (MeJA) to clarify whether two myrosinases, TGG1 and TGG2, function during stomatal closure. ABA, MeJA and H(2)O(2) induced stomatal closure in wild type, tgg1-3 and tgg2-1, but failed to induce stomatal closure in tgg1-3 tgg2-1. All mutants and wild type showed Ca(2+)-induced stomatal closure and ABA-induced reactive oxygen species (ROS)production. A model is discussed in which two myrosinases redundantly function downstream of ROS production and upstream of cytosolic Ca(2+) elevation in ABA and MeJA signaling in guard cells.
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| http://dx.doi.org/10.1093/pcp/pcp066 | DOI Listing |
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The Myrosinases TGG1 and TGG2 Function Redundantly in Reactive Carbonyl Species Signaling in Arabidopsis Guard Cells.
Plant Cell Physiol
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Graduate School of Environmental and Life Science, Okayama University, 1-1-1 Tsushima-Naka, Okayama, 700-8530 Japan.
Myrosinase (β-thioglucoside glucohydrolase, enzyme nomenclature, EC 3.2.1.
View Article and Find Full Text PDFMyrosinases, TGG1 and TGG2, redundantly function in ABA and MeJA signaling in Arabidopsis guard cells.
Plant Cell Physiol
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Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama, Japan.
Article Synopsis
- Myrosinase proteins TGG1 and TGG2 are prevalent in the guard cells of Arabidopsis plants, and their roles in stomatal closure have been studied through various mutant strains.
- Experiments showed that while wild type and single mutants (tgg1-3, tgg2-1) responded to abscisic acid (ABA) and methyl jasmonate (MeJA) by closing their stomata, the double mutant (tgg1-3 tgg2-1) failed to do so.
- The study suggests a model where TGG1 and TGG2 work together, functioning after reactive oxygen species production and before calcium elevation in the signaling pathways triggered by ABA
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