Relating Stomatal Conductance to Leaf Functional Traits

Kröber, Wenzel; Plath, Isa; Heklau, Heike; Bruelheide, Helge

doi:10.3791/52738-v

Cited by 4 publications

(6 citation statements)

References 16 publications

(17 reference statements)

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“…To confirm if the gas exchange measurements were under light saturation, which would be assumed for sunlit leaves, we compared the PAR values during measurement days to a PAR value above which photosynthetic rates saturate in some tropical trees. A previous study showed that the PAR value at which photosynthetic rate in some tropical tree species reached saturation was approximately 800 µmol m -2 s -1 [26][27][28]. The result showed that PAR values on the measurement days were significantly higher than the PAR value for light-saturated photosynthesis (p < 0.001, one-sample t-test).…”

Section: ) Plant Materials and Measurementsmentioning

confidence: 84%

“…The flow rate was set to 250 ml min -1 (TARGAS-1 Portable Photosynthesis System Operation Manual Version 1.04 2018). Photosynthetically active radiation (PAR; µmol m -2 s -1 ) inside the cuvette was set to 1,500 µmol m -2 s -1 , which corresponded to the light saturation ranges in tropical trees [26][27][28]. Atmospheric temperature, relative humidity and CO2 concentration were not controlled and thus tracking ambient conditions.…”

Section: ) Plant Materials and Measurementsmentioning

confidence: 99%

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An Urban Tree (Tabebuia argentea) Exhibits Higher Sensitivity to Environmental Conditions than an Urban Palm (Ptychosperma macarthurii) Growing in the Same Roof Garden: An Implication for Sustainable Urban Water Use

et al. 2023

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Roof gardening is popular for increasing green space in cities due to the restricted urban areas. However, when watering plants on a roof garden, one should consider loading capacity of the roof, which may limit water supply to the plants therein. To improve the efficiency in irrigating trees in a roof garden, we evaluated plant water status, represented by midday leaf water potential (ΨL), and leaf gas exchange parameters including stomatal conductance (gs) and net photosynthesis (An) of a tree (Tabebuia argentea, Ta) and a palm (Ptychosperma macarthurii, Pm) species, which dominate the garden. The ΨL mediated responses of gs and An, regulating plant water use and growth, to soil moisture. Results showed that ΨL of Ta significantly varied with changes in soil moisture, being low at low and high soil moisture. Nevertheless, gs of Ta linearly decreased when ΨL increased, suggesting a stronger response of gs to atmospheric demand. In contrast, no significant responses among the study variables were observed in Pm. For both species, An initially increased with gs and saturated after gs reached 200 mmol m-2 s-1, indicating similar stomatal regulation on atmospheric carbon dioxide absorption. The limited space for root growth and the location with surrounded building walls contributed to unconventional response patterns observed in Ta. Nonetheless, our results suggested that Ta was more sensitive to changing environments, especially the atmospheric demand, than Pm. Additionally, Ta should be irrigated during daytime and when atmospheric vapor pressure deficit is less than 2.6 kPa to allow high photosynthesis and evaporative cooling while Pm may be watered less frequently to reduce the roof’s loading and save water. This initial investigation implied that maintaining urban trees using appropriate irrigation that is specific to tree species is the key to maximize benefits from urban trees and optimize urban water use.

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Section: ) Plant Materials and Measurementsmentioning

confidence: 84%

Section: ) Plant Materials and Measurementsmentioning

confidence: 99%

An Urban Tree (Tabebuia argentea) Exhibits Higher Sensitivity to Environmental Conditions than an Urban Palm (Ptychosperma macarthurii) Growing in the Same Roof Garden: An Implication for Sustainable Urban Water Use

et al. 2023

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“…Kohlrabi had a lower LDMC than apple, but their LMA was similar. LDMC as a functional leaf trait reflects physiological functions, such as transpiration, and is a valid predictor for the parameters of stomatal regulation (Krober et al 2015). A higher LDMC enables a plant to keep the integrity of the leaf even at low moisture and might be linked to the different transpiration responses of the crop species to the adjuvant application.…”

Section: Discussionmentioning

confidence: 99%

Agricultural adjuvants may impair leaf transpiration and photosynthetic activity

Räsch

Hunsche

Mail

et al. 2018

Plant Physiology and Biochemistry

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“…It is therefore possible to estimate the operational stomatal conductance ( g op ) of extinct fossil plants to both CO 2 ( g CO2 ) and water vapor ( g H2O ; 1.6 times g CO2 ) using the g max trait (McElwain et al ., 2016). As functional plant traits, g max and g op provide vital insights into a fossil plant's likely ecological strategy within a paleo‐community as g op correlates strongly with photosynthetic rate (reviewed in Berry et al ., 2010; Medlyn et al ., 2011) and other key traits in the leaf economic spectrum (Kröber et al ., 2015) including LMA (Soh et al ., 2019; Wu et al ., 2020), LNC (Schulze et al ., 1994; Juhrbandt et al ., 2004), and LL (Poorter & Bongers, 2006), and also whole plant WUE (Soh et al ., 2019). Based on the relative ease with which g max can be measured across various modes of plant fossil preservation (McElwain & Steinthorsdottir, 2017) and the fact that it constrains understanding of paleo‐productivity (Franks & Beerling, 2009; Wilson et al ., 2015; McElwain et al ., 2016), the hydrological cycle at local to global levels (Steinthorsdottir et al ., 2012; Jasechko et al ., 2013; White et al ., 2020), and fossil plant WUE (Reichgelt et al ., 2020), we evaluate it here as a paleo‐plant functional trait with strong potential application to a range of research questions relating to plant–climate and plant–atmosphere evolution and Earth system processes in general (Matthaeus et al ., 2023).…”

Section: Fossil Leaf Functional Traitsmentioning

confidence: 99%

Functional traits of fossil plants

McElwain,

Matthaeus,

Barbosa

et al. 2024

New Phytologist

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SummaryA minuscule fraction of the Earth's paleobiological diversity is preserved in the geological record as fossils. What plant remnants have withstood taphonomic filtering, fragmentation, and alteration in their journey to become part of the fossil record provide unique information on how plants functioned in paleo‐ecosystems through their traits. Plant traits are measurable morphological, anatomical, physiological, biochemical, or phenological characteristics that potentially affect their environment and fitness. Here, we review the rich literature of paleobotany, through the lens of contemporary trait‐based ecology, to evaluate which well‐established extant plant traits hold the greatest promise for application to fossils. In particular, we focus on fossil plant functional traits, those measurable properties of leaf, stem, reproductive, or whole plant fossils that offer insights into the functioning of the plant when alive. The limitations of a trait‐based approach in paleobotany are considerable. However, in our critical assessment of over 30 extant traits we present an initial, semi‐quantitative ranking of 26 paleo‐functional traits based on taphonomic and methodological criteria on the potential of those traits to impact Earth system processes, and for that impact to be quantifiable. We demonstrate how valuable inferences on paleo‐ecosystem processes (pollination biology, herbivory), past nutrient cycles, paleobiogeography, paleo‐demography (life history), and Earth system history can be derived through the application of paleo‐functional traits to fossil plants.

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Relating Stomatal Conductance to Leaf Functional Traits

Cited by 4 publications

References 16 publications

An Urban Tree (Tabebuia argentea) Exhibits Higher Sensitivity to Environmental Conditions than an Urban Palm (Ptychosperma macarthurii) Growing in the Same Roof Garden: An Implication for Sustainable Urban Water Use

An Urban Tree (Tabebuia argentea) Exhibits Higher Sensitivity to Environmental Conditions than an Urban Palm (Ptychosperma macarthurii) Growing in the Same Roof Garden: An Implication for Sustainable Urban Water Use

Agricultural adjuvants may impair leaf transpiration and photosynthetic activity

Functional traits of fossil plants

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