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Metabolomics of red‐light‐induced stomatal opening in Arabidopsis thaliana : Coupling with abscisic acid and jasmonic acid metabolism
Author(s) -
Zhu Mengmeng,
Geng Sisi,
Chakravorty David,
Guan Qijie,
Chen Sixue,
Assmann Sarah M.
Publication year - 2020
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/tpj.14594
Subject(s) - guard cell , abscisic acid , jasmonic acid , arabidopsis , metabolome , photosynthesis , metabolomics , biology , arabidopsis thaliana , microbiology and biotechnology , biochemistry , botany , chemistry , biophysics , mutant , metabolite , salicylic acid , bioinformatics , gene
Summary Environmental stimuli‐triggered stomatal movement is a key physiological process that regulates CO 2 uptake and water loss in plants. Stomata are defined by pairs of guard cells that perceive and transduce external signals, leading to cellular volume changes and consequent stomatal aperture change. Within the visible light spectrum, red light induces stomatal opening in intact leaves. However, there has been debate regarding the extent to which red‐light‐induced stomatal opening arises from direct guard cell sensing of red light versus indirect responses as a result of red light influences on mesophyll photosynthesis. Here we identify conditions that result in red‐light‐stimulated stomatal opening in isolated epidermal peels and enlargement of protoplasts, firmly establishing a direct guard cell response to red light. We then employ metabolomics workflows utilizing gas chromatography mass spectrometry and liquid chromatography mass spectrometry for metabolite profiling and identification of Arabidopsis guard cell metabolic signatures in response to red light in the absence of the mesophyll. We quantified 223 metabolites in Arabidopsis guard cells, with 104 found to be red light responsive. These red‐light‐modulated metabolites participate in the tricarboxylic acid cycle, carbon balance, phytohormone biosynthesis and redox homeostasis. We next analyzed selected Arabidopsis mutants, and discovered that stomatal opening response to red light is correlated with a decrease in guard cell abscisic acid content and an increase in jasmonic acid content. The red‐light‐modulated guard cell metabolome reported here provides fundamental information concerning autonomous red light signaling pathways in guard cells.