A5041038246- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Plant responses to elevated CO2
- Remote Sensing in Agriculture
- Ecology and Vegetation Dynamics Studies
- Atmospheric and Environmental Gas Dynamics
- Photosynthetic Processes and Mechanisms
- Forest ecology and management
- Plant and animal studies
- Light effects on plants
- Remote Sensing and LiDAR Applications
- Plant Stress Responses and Tolerance
- Fire effects on ecosystems
- Lipid metabolism and biosynthesis
- Plant Pathogens and Resistance
- Forest Ecology and Biodiversity Studies
- Water Quality Monitoring and Analysis
- Species Distribution and Climate Change
- Algal biology and biofuel production
- Phase Equilibria and Thermodynamics
- Photoreceptor and optogenetics research
- Plant Parasitism and Resistance
- Lichen and fungal ecology
Michigan State University
2022-2024
Western University
2022-2024
Columbia University
2018-2022
New York Botanical Garden
2020-2022
Bowdoin College
2012
Summary CO 2 release in the light ( R L ) and its presumed source, oxidative pentose phosphate pathways, were found to be insensitive concentration. The pathways form glucose 6‐phosphate (G6P) shunts that bypass nonoxidative reactions of Calvin–Benson cycle. Using adenosine diphosphate uridine as proxies for labeling G6P stroma cytosol respectively, it was only cytosolic shunt active. Uridine glucose, a proxy G6P, 6‐phosphogluconate (6PG) significantly less labeled than cycle intermediates...
We developed Blue Intensity (BI) measurements from the crossdated ring sequences of Fokienia hodginsii (of family Cupressaceae) central Vietnam. BI has been utilized primarily as an indirect proxy measurement latewood (LW) density conifers (i.e., LWBI) high latitude, temperature-limited boreal forests. As such, closely approximates maximum (MXD) made soft x-ray. The less commonly used earlywood (EW) (EWBI) represents minimum EW and is influenced by lighter pixels vacuoles or lumens cells....
Abstract Recent advancements in understanding remotely sensed solar‐induced chlorophyll fluorescence often suggest a linear relationship with gross primary productivity at large spatial scales. However, the quantum yields of and photochemistry are not linearly related, this is largely driven by irradiance. This raises questions about mechanistic basis observed linearity from complex canopies that experience heterogeneous irradiance regimes subcanopy We present empirical data two evergreen...
Leaf-level gas exchange data support the mechanistic understanding of plant fluxes carbon and water. These inform our ecosystem function, are an important constraint on parameterization terrestrial biosphere models, necessary to understand response plants global environmental change, integral efforts improve crop production. Collection these using analyzers can be both technically challenging time consuming, individual studies generally focus a small range species, restricted periods, or...
Abstract Light respiration (RL) is an important component of plant carbon balance and a key parameter in photosynthesis models. RL often measured using the Laisk method, gas exchange technique that traditionally employed under steady-state conditions. However, nonsteady-state dynamic assimilation (DAT) may allow for more rapid measurements. In 2 studies, we examined efficacy DAT estimating Ci* (the intercellular CO2 concentration where Rubisco's oxygenation velocity twice its carboxylation...
Relationships between gross primary productivity (GPP) and the remotely sensed photochemical reflectance index (PRI) suggest that time series of foliar PRI may provide insight into climate change effects on carbon cycling. However, because a large fraction assimilated via GPP is quickly returned to atmosphere respiration, we ask critical question-can information about longer term gains in aboveground stocks? Here study suitability understand intra-annual stem-growth dynamics at one world's...
Light availability drives vertical canopy gradients in photosynthetic functioning and carbon (C) balance, yet patterns of variability these remain unclear. We measured light availability, CO
Infection by eastern dwarf mistletoe (Arceuthobium pusillum) modifies needle and branch morphology hastens white spruce (Picea glauca) mortality. We examined potential causal mechanisms assessed the impacts of infection-induced alterations to host development performance across scales ranging from hormone contents bole expansion. Needles on infected branches (IBs) possessed higher total cytokinin (CK) lower abscisic acid than needles uninfected (UBs). IBs exhibited greater xylem growth...
Abstract Photosynthetic traits suggest that shade tolerance may explain the contrasting success of two conifer taxa, Podocarpaceae and Pinaceae, in tropical forests. Needle‐leaved species from Pinus (Pinaceae) are generally absent forests, whereas krempfii , a flat‐leaved pine, numerous abundant. Respiration ( R ) provide additional insight into drivers needle‐ conifers We measured short‐term respiratory temperature (RT) response between 10 50°C foliar morphological three seven coexisting...
The absence of pines from tropical forests is a puzzling biogeographical oddity potentially explained by traits shade intolerance. Pinus krempfii (Lecomte), flat-leaved pine endemic to the Central Highlands Vietnam, provides notable exception as it seems compete successfully with shade-tolerant species. Here, we test hypothesis that successful conifer performance at juvenile stage depends on physiological tolerance comparing characteristics P. coexisting species two taxa: genus Pinus, and...
White spruce (Picea glauca) spans a massive range, yet the variability in respiratory physiology and related implications for tree carbon balance at extremes of this distribution remain as enigmas. Working both most northern southern extents range more than 5000 km apart, we measured short-term temperature response dark respiration (R/T) upper lower canopy positions. R/T curves were fit to polynomial thermodynamic models so that model parameters could be compared among locations, positions,...
Arctic Treeline is the transition from boreal forest to treeless tundra and may be determined by growing season temperatures. The physiological mechanisms involved in determining relationship between physical biological environment location of treeline are not fully understood. In Northern Alaska, we studied temperature leaf respiration 36 white spruce (Picea glauca) trees, sampling both upper lower canopy, test two research hypotheses. first hypothesis that canopy leaves, which more...
Plant metabolism faces a challenge of investing enough enzymatic capacity to pathway without overinvestment. As it takes energy and resources build, operate, maintain enzymes, there are benefits drawbacks accurately matching the influx. The relationship between functional physiological load could be explained through symmorphosis, which would quantitatively match Alternatively, plants excess manage unpredictable In this study, we use photorespiration as case study investigate these two...
Abstract White spruce ( Picea glauca ) spans a massive range from arctic treeline to temperate forests, yet the variability in respiratory physiology and related implications for tree carbon balance at extremes of this distribution remain as enigmas. Working both most northern southern extents white more than 5000 km apart, we measured short- term temperature response dark respiration R /T) upper lower canopy positions. /T curves were fit polynomial thermodynamic models so that model...
ABSTRACT Light availability drives vertical canopy gradients in photosynthetic functioning and carbon (C) balance, yet patterns of variability these remain unclear. We measured light availability, CO 2 response curves, foliar C, nitrogen (N) pigment concentrations, the photochemical reflectance index (PRI) on upper lower needles white spruce trees ( Picea glauca ) at species’ northern southern range extremes. combined our data with previously published respiratory to compare contrast C...