ArticleThe Plant cell2022
Out of the blue: Phototropins of the leaf vascular bundle sheath mediate the regulation of leaf hydraulic conductance by blue light.
Article in The Plant cell, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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6 citing papers in PubMed, 14 citations in OpenAlex.
- Transcriptome Dynamics Provide Insight into the Mechanisms Underlying Cucumber Stomatal Movement Regulated by Blue Light (BL) and Drought Stress.International journal of molecular sciences · 2026Article
- Inducibility of cyclic electron transport is linked to the transition from C3-C4 to C4 photosynthesis in Flaveria.Plant physiology · 2026Article
- Phylogenomic profile of exon-intron organization across angiosperms, their relationships with protein domains, and functional implications.Nature communications · 2026Article
- Localized measurements of water potential reveal large loss of conductance in living tissues of maize leaves.Plant physiology · 2024Article
- Leaf hydraulic maze: Abscisic acid effects on bundle sheath, palisade, and spongy mesophyll conductance.Plant physiology · 2023Article
- A surprising feature of the blue light: Regulation of leaf hydraulic conductance via an autonomous phototropin-mediated blue light signaling pathway in bundle-sheath cells.The Plant cell · 2022Article
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5 authors at 1 institution in 1 country.
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Abstract
The Arabidopsis (Arabidopsis thaliana) leaf veins bundle-sheath cells (BSCs)-a selective barrier to water and solutes entering the mesophyll-increase the leaf radial hydraulic conductance (Kleaf) by acidifying the xylem sap by their plasma membrane H+-ATPase, AHA2. Based on this and on the BSCs' expression of phototropins PHOT1 and PHOT2, and the known blue light (BL)-induced Kleaf increase, we hypothesized that, resembling the guard cells, BL perception by the BSCs' phots activates its H+-ATPase, which, consequently, upregulates Kleaf. Indeed, under BL, the Kleaf of the knockout mutant lines phot1-5, phot2-1, phot1-5 phot2-1, and aha2-4 was lower than that of the wild-type (WT). BSC-only-directed complementation of phot1-5 or aha2-4 by PHOT1 or AHA2, respectively, restored the BL-induced Kleaf increase. BSC-specific silencing of PHOT1 or PHOT2 prevented such Kleaf increase. A xylem-fed kinase inhibitor (tyrphostin 9) replicated this also in WT plants. White light-ineffective in the phot1-5 mutant-acidified the xylem sap (relative to darkness) in WT and in the PHOT1-complemented phot1-5. These results, supported by BL increase of BSC protoplasts' water permeability and cytosolic pH and their hyperpolarization by BL, identify the BSCs as a second phot-controlled water conductance element in leaves, in series with stomatal conductance. Through both, BL regulates the leaf water balance.
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