Katherine A. McCulloh
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View article: Water, not carbon, drives drought‐constraints on stem terpene defense against simulated bark beetle attack in <i>Pinus edulis</i>
Water, not carbon, drives drought‐constraints on stem terpene defense against simulated bark beetle attack in <i>Pinus edulis</i> Open
Summary Drought predisposes forest trees to bark beetle‐induced mortality, but the physiological mechanisms remain unclear. While drought‐induced water and carbon limitations have been implicated in defensive failure and tree susceptibilit…
View article: Physiological trait coordination and variability across and within three <i>Pinus</i> species
Physiological trait coordination and variability across and within three <i>Pinus</i> species Open
Summary Studies have explored how traits separate plants ecologically and the trade‐offs that underpin this separation. However, uncertainty remains as to the taxonomic scale at which traits can predictably separate species. We studied how…
View article: PSInet: a new global water potential network
PSInet: a new global water potential network Open
Given the pressing challenges posed by climate change, it is crucial to develop a deeper understanding of the impacts of escalating drought and heat stress on terrestrial ecosystems and the vital services they offer. Soil and plant water p…
View article: Save or spend? Diverging water‐use strategies of grasses and encroaching clonal shrubs
Save or spend? Diverging water‐use strategies of grasses and encroaching clonal shrubs Open
Shrub encroachment is one of the primary threats to mesic grasslands around the world. This dramatic shift in plant cover has the potential to alter ecosystem‐scale water budgets and responses to novel rainfall regimes. Understanding diver…
View article: Using root and soil traits to forecast woody encroachment dynamics in mesic grassland
Using root and soil traits to forecast woody encroachment dynamics in mesic grassland Open
Grasslands are a widespread and globally important biome providing key ecosystem services including C storage and regulation of the water cycle. Grasslands face multiple threats, including changes in drought intensity and woody encroachmen…
View article: Ecophysiological adaptations shape distributions of closely related trees along a climatic moisture gradient
Ecophysiological adaptations shape distributions of closely related trees along a climatic moisture gradient Open
View article: Linking stem rehydration kinetics to hydraulic traits using a novel method and mechanistic model
Linking stem rehydration kinetics to hydraulic traits using a novel method and mechanistic model Open
Background Despite the recognized importance of hydraulic capacitance as a mechanism used by plants to maintain hydraulic functioning during high transpiration, characterizing the dynamics of capacitance remains a challenge. Methods We use…
View article: Functional traits and trait coordination change over the life of a leaf in a tropical fern species
Functional traits and trait coordination change over the life of a leaf in a tropical fern species Open
Premise Plant ecological strategies are often defined by the integration of underlying traits related to resource acquisition, allocation, and growth. Correlations between key traits across diverse plants suggest that variation in plant ec…
View article: Data - Krieg et al. Reproductive phases coincide with changes in morphology and photosynthetic physiology in an endangered cycad species
Data - Krieg et al. Reproductive phases coincide with changes in morphology and photosynthetic physiology in an endangered cycad species Open
Summary of the data set used in Krieg et al. (2023) Reproductive phases coincide with changes in morphology and photosynthetic physiology in an endangered cycad species. Conservation Physiology.
View article: Data - Krieg et al. Reproductive phases coincide with changes in morphology and photosynthetic physiology in an endangered cycad species
Data - Krieg et al. Reproductive phases coincide with changes in morphology and photosynthetic physiology in an endangered cycad species Open
Summary of the data set used in Krieg et al. (2023) Reproductive phases coincide with changes in morphology and photosynthetic physiology in an endangered cycad species. Conservation Physiology.
View article: Data - Krieg et al. (2023) Functional Traits and Trait Co-ordination Change Over the Life of a Leaf in a Tropical Fern Species. AJB.
Data - Krieg et al. (2023) Functional Traits and Trait Co-ordination Change Over the Life of a Leaf in a Tropical Fern Species. AJB. Open
Summary of the data set used in Krieg et al. (2023) Functional Traits and Trait Co-ordination Change Over the Life of a Leaf in a Tropical Fern Species. AJB.
View article: Data - Krieg et al. (2023) Functional Traits and Trait Co-ordination Change Over the Life of a Leaf in a Tropical Fern Species. AJB.
Data - Krieg et al. (2023) Functional Traits and Trait Co-ordination Change Over the Life of a Leaf in a Tropical Fern Species. AJB. Open
Summary of the data set used in Krieg et al. (2023) Functional Traits and Trait Co-ordination Change Over the Life of a Leaf in a Tropical Fern Species. AJB.
View article: Reproductive phases coincide with changes in morphology and photosynthetic physiology in an endangered cycad species
Reproductive phases coincide with changes in morphology and photosynthetic physiology in an endangered cycad species Open
Cycadales is highly endangered and one of the oldest dioecious gymnosperm lineages, making their reproductive biology highly relevant to conservation efforts and our understanding of the impact of dioecy, yet cycad reproductive ecophysiolo…
View article: At least it is a dry cold: the global distribution of freeze–thaw and drought stress and the traits that may impart poly-tolerance in conifers
At least it is a dry cold: the global distribution of freeze–thaw and drought stress and the traits that may impart poly-tolerance in conifers Open
Conifers inhabit some of the most challenging landscapes where multiple abiotic stressors (e.g., aridity, freezing temperatures) often co-occur. Physiological tolerance to multiple stressors (‘poly-tolerance’) is thought to be rare because…
View article: Hydroscapes, hydroscape plasticity and relationships to functional traits and mesophyll photosynthetic sensitivity to leaf water potential in <i>Eucalyptus</i> species
Hydroscapes, hydroscape plasticity and relationships to functional traits and mesophyll photosynthetic sensitivity to leaf water potential in <i>Eucalyptus</i> species Open
The isohydric–anisohydric continuum describes the relative stringency of stomatal control of leaf water potential ( ψ leaf ) during drought. Hydroscape area ( HA )—the water potential landscape over which stomata regulate ψ leaf —has emerg…
View article: Trehalose increases tomato drought tolerance, induces defenses, and increases resistance to bacterial wilt disease
Trehalose increases tomato drought tolerance, induces defenses, and increases resistance to bacterial wilt disease Open
Ralstonia solanacearum causes bacterial wilt disease, leading to severe crop losses. Xylem sap from R . solanacearum -infected tomato is enriched in the disaccharide trehalose. Water-stressed plants also accumulate trehalose, which increas…
View article: Hydroscapes, hydroscape plasticity, and relationships to plant functional traits and mesophyll photosynthetic sensitivity in Eucalyptus species
Hydroscapes, hydroscape plasticity, and relationships to plant functional traits and mesophyll photosynthetic sensitivity in Eucalyptus species Open
The isohydric-anisohydric continuum describes the relative stringency of stomatal control of leaf water potential ( ψ ) during drought. Hydroscape area ( HA ) – the water potential landscape over which stomata regulate ψ – has emerged as a…
View article: Revisiting the Source of Wilt Symptoms: X-Ray Microcomputed Tomography Provides Direct Evidence That <i>Ralstonia</i> Biomass Clogs Xylem Vessels
Revisiting the Source of Wilt Symptoms: X-Ray Microcomputed Tomography Provides Direct Evidence That <i>Ralstonia</i> Biomass Clogs Xylem Vessels Open
Ralstonia causes wilt diseases by colonizing xylem vessels and disrupting water transport. The dogma is that bacterial biomass clogs vessels and reduces the flow of xylem sap due to Ralstonia abundance. However, the physiological mechanism…
View article: Revisiting the source of wilt symptoms: X-ray microcomputed tomography provides direct evidence that<i>Ralstonia</i>biomass clogs xylem vessels
Revisiting the source of wilt symptoms: X-ray microcomputed tomography provides direct evidence that<i>Ralstonia</i>biomass clogs xylem vessels Open
Plant pathogenic Ralstonia cause wilt diseases by colonizing xylem vessels and disrupting water transport. Due to the abundance of Ralstonia cells in vessels, the dogma is that bacterial biomass clogs vessels and reduces the flow of xylem …
View article: Mesophyll photosynthetic sensitivity to leaf water potential in <i>Eucalyptus</i>: a new dimension of plant adaptation to native moisture supply
Mesophyll photosynthetic sensitivity to leaf water potential in <i>Eucalyptus</i>: a new dimension of plant adaptation to native moisture supply Open
Summary Photosynthetic sensitivity to drought is a fundamental constraint on land‐plant evolution and ecosystem function. However, little is known about how the sensitivity of photosynthesis to nonstomatal limitations varies among species …
View article: Hydraulic Responses of Shrubs and Grasses to Fire Frequency and Drought in a Tallgrass Prairie Experiencing Bush Encroachment
Hydraulic Responses of Shrubs and Grasses to Fire Frequency and Drought in a Tallgrass Prairie Experiencing Bush Encroachment Open
The increase in abundance and density of woody plants in herbaceous ecosystems (i.e. bush encroachment) is occurring globally and is driven by reduced fire frequency, climate change, and the utilization of deeper, more reliable soil water …
View article: Tip‐to‐base xylem conduit widening as an adaptation: causes, consequences, and empirical priorities
Tip‐to‐base xylem conduit widening as an adaptation: causes, consequences, and empirical priorities Open
Summary In the stems of terrestrial vascular plants studied to date, the diameter of xylem water‐conducting conduits D widens predictably with distance from the stem tip L approximating D ∝ L b , with b ≈ 0.2. Because conduit diameter is c…
View article: Species-specific combined effects of heatwaves, drought, and elevated [CO2] on cellular metabolism in the foliage Picea abies and Betula papyrifera
Species-specific combined effects of heatwaves, drought, and elevated [CO2] on cellular metabolism in the foliage Picea abies and Betula papyrifera Open
In recent decades, the rising severity of summer heatwaves has increased the co-occurrence of heat and drought stress leading to forest mortality and to reductions in crop yield. Plant responses to this combined stress can be unique from t…
View article: Bridging the Flux Gap: Sap Flow Measurements Reveal Species‐Specific Patterns of Water Use in a Tallgrass Prairie
Bridging the Flux Gap: Sap Flow Measurements Reveal Species‐Specific Patterns of Water Use in a Tallgrass Prairie Open
Predicting the hydrological consequences following changes in grassland vegetation type (i.e., woody encroachment) requires an understanding of water flux dynamics at high spatiotemporal resolution for predominant species within grassland …
View article: Physiological responses of germinant Pinus palustris and P. taeda seedlings to water stress and the significance of the grass-stage
Physiological responses of germinant Pinus palustris and P. taeda seedlings to water stress and the significance of the grass-stage Open
View article: Plant water uptake along a diversity gradient provides evidence for complementarity in hydrological niches
Plant water uptake along a diversity gradient provides evidence for complementarity in hydrological niches Open
Biodiversity enhances a variety of ecosystem processes, and yet the underlying mechanisms through which these relationships occur remain a critical knowledge gap. Here, we used the natural abundance of stable isotopes to measure depth of w…
View article: A dynamic yet vulnerable pipeline: Integration and coordination of hydraulic traits across whole plants
A dynamic yet vulnerable pipeline: Integration and coordination of hydraulic traits across whole plants Open
The vast majority of measurements in the field of plant hydraulics have been on small‐diameter branches from woody species. These measurements have provided considerable insight into plant functioning, but our understanding of plant physio…
View article: A new protocol for psychrometric pressure–volume curves of fern gametophytes
A new protocol for psychrometric pressure–volume curves of fern gametophytes Open
Premise Pressure – volume curves are a widely used analytical framework to derive several key physiological traits related to plant–water relations, including a species’ turgor loss point, osmotic potential at full turgor, and the elastici…
View article: Coordination and trade‐offs between leaf and stem hydraulic traits and stomatal regulation along a spectrum of isohydry to anisohydry
Coordination and trade‐offs between leaf and stem hydraulic traits and stomatal regulation along a spectrum of isohydry to anisohydry Open
The degree of plant iso/anisohydry, a widely used framework for classifying species‐specific hydraulic strategies, integrates multiple components of the whole‐plant hydraulic pathway. However, little is known about how it associates with c…
View article: Linking leaf hydraulic properties, photosynthetic rates, and leaf lifespan in xerophytic species: a test of global hypotheses
Linking leaf hydraulic properties, photosynthetic rates, and leaf lifespan in xerophytic species: a test of global hypotheses Open
Premise of the Study Leaf venation and its hierarchal traits are crucial to the hydraulic and mechanical properties of leaves, reflecting plant life‐history strategies. However, there is an extremely limited understanding of how variation …