Illuminating plant water dynamics: the role of light in leaf hydraulic regulation

Summary Light intensity and quality influence photosynthesis directly but also have an indirect effect by increasing stomatal apertures and enhancing gas exchange. Consequently, in areas such as the upper canopy, a high water demand for transpiration and temperature regulation is created. This paper...

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Bibliographic Details
Published in:The New phytologist 2024-02, Vol.241 (4), p.1404-1414
Main Authors: Grunwald, Yael, Yaaran, Adi, Moshelion, Menachem
Format: Article
Language:English
Subjects:
aquaporins
blue light
bundle sheath
Canopies
Canopy
Cooling
Cooling systems
Gas exchange
leaf hydraulic conductance
Leaves
Light intensity
Luminous intensity
Permeability
Photosynthesis
Plant cover
Plant tissues
plant water balance dynamics
red light
Signal transduction
Stomata
Transpiration
Vascular tissue
Water
Water demand
water use efficiency
xylem
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Summary:Summary Light intensity and quality influence photosynthesis directly but also have an indirect effect by increasing stomatal apertures and enhancing gas exchange. Consequently, in areas such as the upper canopy, a high water demand for transpiration and temperature regulation is created. This paper explores how light intensity and the natural high Blue‐Light (BL) : Red‐Light (RL) ratio in these areas, is important for controlling leaf hydraulic conductance (Kleaf) by BL signal transduction, increasing water permeability in cells surrounding the vascular tissue, in supporting the enormous water demands. Conversely, shaded inner‐canopy areas receive less radiation, have lower water and cooling demands, and exhibit reduced Kleaf due to diminished intensity and BL induction. Intriguingly, shaded leaves display higher water‐use efficiency (compared with upper‐canopy) due to decreased transpiration and cooling requirements while the presence of RL supports photosynthesis.
ISSN:0028-646X
1469-8137
DOI:10.1111/nph.19497