Abstract
Plants respond to soil and atmospheric water deficits through strategies such as stomatal regulation and belowground adaptations. Root mucilage buffers erratic fluctuations in the rhizosphere water content, yet its influence on soil hydraulic properties, especially unsaturated hydraulic conductivity, and stomatal regulation remains unknown. We hypothesized that mucilage facilitates water uptake by attenuating the drop in matric potential at the root-soil interface during soil and atmospheric drying. We measured the impact of various maize (Zea mays) mucilage contents (0.0%, 0.05%, 0.2%, and 0.4%) on the water retention and hydraulic conductivity of a loamy soil. Leveraging a soil-plant hydraulic model, we investigated the effects of mucilage contents on transpiration and stomatal responses under soil drying and increased vapor pressure deficit (VPD). Higher mucilage contents prevented sharp declines in unsaturated hydraulic conductivity as soils dried. Simulations revealed that higher mucilage contents delayed the onset of hydraulic stress (the threshold transpiration rate beyond which a small increase in transpiration would result in a disproportionate decline in leaf water potential), broadened the hydroscape zone, and shifted stomatal behavior from isohydric to more anisohydric regulation, enabling plants to sustain stable transpiration and lower midday leaf water potentials under drought. The buffering effects on soil-plant hydraulics persisted across varying degrees of VPD, although high mucilage contents accelerated soil drying, indicating a trade-off between improved water uptake and faster moisture depletion during prolonged drought. Our findings underscore the important role of mucilage in modulating soil-plant water relations and stomatal regulation, offering insights into strategies for improving plant responses to soil and atmospheric drought.
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Claims 8
Claim · model-written summary
Higher maize mucilage contents prevented sharp declines in unsaturated hydraulic conductivity as soils dried.
- Treatment
- Higher mucilage contentse1
- Outcome
- unsaturated hydraulic conductivitye1
- Direction
- prevented sharp declinese1
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Higher mucilage contents prevented sharp declines in unsaturated hydraulic conductivity as soils dried”
e2“maize (Zea mays)”
Claim · model-written summary
Simulations indicated that higher maize mucilage contents delayed the onset of hydraulic stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Simulations revealed that higher mucilage contents delayed the onset of hydraulic stress”
e2“maize (Zea mays)”
Claim · model-written summary
Simulations indicated that higher maize mucilage contents broadened the hydroscape zone.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“broadened the hydroscape zone”
e2“maize (Zea mays)”
e3“Simulations revealed that higher mucilage contents”
Claim · model-written summary
Simulations indicated that higher maize mucilage contents shifted stomatal behavior from isohydric to more anisohydric regulation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“shifted stomatal behavior from isohydric to more anisohydric regulation”
e2“maize (Zea mays)”
e3“Simulations revealed that higher mucilage contents”
Claim · model-written summary
Higher maize mucilage contents enabled plants to sustain stable transpiration under drought in simulations.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“enabling plants to sustain stable transpiration and lower midday leaf water potentials under drought”
e2“maize (Zea mays)”
e3“Simulations revealed that higher mucilage contents”
Claim · model-written summary
Higher maize mucilage contents lowered midday leaf water potentials under drought in simulations.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“enabling plants to sustain stable transpiration and lower midday leaf water potentials under drought”
e2“maize (Zea mays)”
e3“Simulations revealed that higher mucilage contents”
Claim · model-written summary
The buffering effects of maize mucilage on soil-plant hydraulics persisted across varying degrees of vapor pressure deficit.
- Treatment
- varying degrees of VPDe1
- Outcome
- buffering effects on soil-plant hydraulicse1
- Direction
- persistede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The buffering effects on soil-plant hydraulics persisted across varying degrees of VPD”
e2“maize (Zea mays)”
Claim · model-written summary
High maize mucilage contents accelerated soil drying, a trade-off against improved water uptake during prolonged drought.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“high mucilage contents accelerated soil drying”
e2“maize (Zea mays)”