LOX1 oxylipins close stomata in defense
Guard-cell LOX1 drives ABA-independent stomatal closure that limits Pseudomonas colonization.
Source
An abscisic acid-independent oxylipin pathway controls stomatal closure and immune defense in Arabidopsis
Study at a glance
- Design
- Animal / in-vitro — Arabidopsis LOX1 mutants tested for stomatal immunity and Pst colonization
- N
- Plant mutant phenotyping; no single primary analytic N in stored text
- Population
- Arabidopsis thaliana (lox1 mutants vs wild type/complemented lines)
- Outcome
- Stomatal closure and Pst leaf colonization controlled by LOX1/oxylipins
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Inspect source passages
LOX1 oxylipins close stomata in defense
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
lox1 mutants had more than 10-fold enhanced Pst growth.
The two lox1 mutant lines displayed more than 10-fold enhanced growth of Pst DC3000 as compared to the complemented and WT lines, suggesting that LOX1 participates in the control of bacterial leaf colonization.
lox1 bacterial load?
more than 10-fold enhanced growth of Pst DC3000
What they did
Mapped LOX expression to cell types, tested lox1 mutants for Pst growth and stomatal responses to bacteria/PAMPs, and placed the pathway relative to ABA.
What they found
LOX1 is guard-cell expressed; lox1 mutants show >10-fold more Pst growth and impaired flg22/Pst-induced stomatal closure.
The limits
What it doesn't show
Does not inventory every oxylipin species in all tissues.
Key terms
- LOX1
- 9-lipoxygenase gene expressed in guard cells.
- Stomata
- Leaf pores that microbes can enter.
- Oxylipin
- Oxygenated fatty-acid signaling molecule.
- flg22
- Flagellin PAMP peptide.
- ABA
- Abscisic acid drought/stress hormone.
- Pst DC3000
- Pseudomonas syringae leaf pathogen.
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lox1 Pst growth:
Common questions
lox1 pathogen phenotype?
>10-fold more Pst growth.
Where is LOX1 expressed?
Guard cells.
PAMP tested?
flg22.
ABA dependence?
Pathway can act independently of ABA.
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