Abstract
Summary The regulation of stomata in response to environmental changes is one of the most dynamic and important behaviours in vascular plants, playing a central role in determining gas exchange and vulnerability to drought. Yet whether this regulation is determined by intrinsic species physiology or by soil hydraulic properties or a combination of both remains unsolved. Here, we use a long‐term dataset of needle water potential (Ψ needle ) measurements to compare stomatal regulation in a hardy conifer, Callitris rhomboidea , growing at two sites with contrasting soil textures: sand and clay‐loam. Inferred stomatal sensitivity to water potential differed between soil types when expressed against soil water potential but exhibited a universal relationship to Ψ needle . This observation aligned with the predictions from an optimal soil water extraction model, indicating that distinct optimal water extraction in the two soil types could be achieved through a common relationship between stomatal conductance and Ψ needle . Our results suggest that the primary driver of stomatal response to soil and atmospheric dryness lies in a common response to leaf water potential. This work reconciles competing ideas of stomatal control, indicating how the appearance of soil‐specific behaviour is in fact the expected consequence of a single, optimal physiological behaviour across soil types. Characterising the variation in species‐specific stomatal response to leaf water potential will enable comparisons of water extraction behaviour between species in different soils.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Inferred stomatal sensitivity differed between soil types when expressed against soil water potential.
- Taxon
- Callitris rhomboidea
_cones.jpg?width=60)
Callitris rhomboideae1 - Outcome
- stomatal sensitivity to water potentiale0
- Direction
- differede0
- Setting
- soil typese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_cones.jpg?width=500)
Verbatim
e0“Inferred stomatal sensitivity to water potential differed between soil types when expressed against soil water potential”
e1“Callitris rhomboidea”
Claim · model-written summary
Stomatal sensitivity showed a universal relationship to needle water potential across soils.
- Taxon
- Callitris rhomboideaCallitris rhomboideae1
- Organ / stage
- needlee0
- Outcome
- universal relationship to Ψ needlee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but exhibited a universal relationship to Ψ needle .”
e1“Callitris rhomboidea”
Claim · model-written summary
Observed stomatal sensitivity aligned with predictions of an optimal soil water extraction model.
- Taxon
- Callitris rhomboideaCallitris rhomboideae1
- Outcome
- aligned with the predictionse0
- Comparator
- optimal soil water extraction modele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This observation aligned with the predictions from an optimal soil water extraction model”
e1“Callitris rhomboidea”
Claim · model-written summary
The model indicated distinct optimal water extraction in two soils could follow a common stomatal conductance relation to needle water potential.
- Taxon
- Callitris rhomboideaCallitris rhomboideae1
- Outcome
- optimal water extractione0
- Qualifier
- common relationship between stomatal conductance and Ψ needlee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“distinct optimal water extraction in the two soil types could be achieved through a common relationship between stomatal conductance and Ψ needle”
e1“Callitris rhomboidea”
Claim · model-written summary
The authors infer that stomatal response to soil and atmospheric dryness is primarily driven by leaf water potential.
- Taxon
- Callitris rhomboideaCallitris rhomboideae1
- Outcome
- stomatal response to soil and atmospheric drynesse0
- Qualifier
- common response to leaf water potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the primary driver of stomatal response to soil and atmospheric dryness lies in a common response to leaf water potential.”
e1“Callitris rhomboidea”