Heat stress strongly induces monoterpene emissions in some plants with specialized terpenoid storage structures

Nagalingam, Sanjeevi; Seco, Roger; Kim, Saewung

doi:10.1016/j.agrformet.2023.109400

Cited by 12 publications

(7 citation statements)

References 47 publications

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“…Figure shows a schematic of the custom-built, dynamic (i.e., continuous air flow) leaf cuvette system used to study HCHO bidirectional exchange in the laboratory. The centerpiece of the system is a cuvette assembly based on the design of Harley et al and Nagalingam et al , In short, a 0.5 L cuvette (Allen Scientific Glass) composed of two separable halves was fabricated from borosilicate glass to eliminate the need for any plastics that may emit HCHO or other VOCs. In the lower half of the cuvette, a cut groove provides space for an O-ring that is coated in Fluoropel to minimize VOC outgassing.…”

Section: Methodsmentioning

confidence: 99%

Leaf-Level Bidirectional Exchange of Formaldehyde on Deciduous and Evergreen Tree Saplings

Shutter,

Cox,

Keutsch

2024

ACS Earth Space Chem.

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Gas-phase formaldehyde (HCHO) is formed in high yield from the oxidation of many volatile organic compounds (VOCs) and is commonly used as a constraint when testing the performance of VOC oxidation mechanisms in models. However, prior to using HCHO as a model constraint for VOC oxidation in forested regions, it is essential to have a thorough understanding of its foliar exchange. Therefore, a controlled laboratory setup was designed to measure the emission and dry deposition of HCHO at the leaf-level to red oak (Quercus rubra) and Leyland cypress (Cupressus × leylandii) tree saplings. The results show that HCHO has a compensation point (CP) that rises exponentially with temperature (22−35 °C) with a mean range of 0.3−0.9 ppbv. The HCHO CP results are also found to be independent of the studied tree species and 40−70% relative humidity. Given that HCHO mixing ratios in forests during the daytime are usually greater than 1 ppbv, the magnitude of the CP suggests that trees generally act as a net sink of HCHO. Additionally, the results show that HCHO foliar exchange is stomatally controlled and better matches a reactivity factor (f 0 ) of 0 as opposed to 1 in conventional dry deposition parametrizations. At 30 °C, daytime HCHO dry deposition fluxes are reduced by upward of 50% when using f 0 = 0 and a nonzero HCHO CP, although deposition remains the dominant canopy sink of HCHO. A reduced deposition sink also implies the increased importance of the gas-phase photolysis of HCHO as a source of HO 2 .

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Section: Methodsmentioning

confidence: 99%

Leaf-Level Bidirectional Exchange of Formaldehyde on Deciduous and Evergreen Tree Saplings

Shutter,

Cox,

Keutsch

2024

ACS Earth Space Chem.

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“…The system details are described by Nagalingam et al. (2023). Branches were cut, placed in water, and exposed to a natural light diurnal cycle 1–2 days before each experiment.…”

Section: Methodsmentioning

confidence: 99%

“…A portable custom-made leaf glass chamber system was used for these experiments. The system details are described by Nagalingam et al (2023). Branches were cut, placed in water, and exposed to a natural light diurnal cycle 1-2 days before each experiment.…”

Section: Temperature Response Curve Experimentsmentioning

confidence: 99%

Arctic Heatwaves Could Significantly Influence the Isoprene Emissions From Shrubs

Wang,

Welch,

Nagalingam

et al. 2024

Geophysical Research Letters

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Warming climate in the Arctic is leading to an increase in isoprene emission from ecosystems. We assessed the influence of temperature on isoprene emission from Arctic willows with laboratory and field measurements. Our findings indicate that the hourly temperature response curve of Salix spp., the dominant isoprene emitting shrub in the Arctic, aligns with that of temperate plants. In contrast, the isoprene capacity of willows exhibited a more substantial than expected response to the mean ambient temperature of the previous day, which is much stronger than the daily temperature response predicted by the current version of the Model of Emissions of Gases and Aerosols from Nature (MEGAN). With a modified algorithm from this study, MEGAN predicts 66% higher isoprene emissions for Arctic willows during an Arctic heatwave. However, despite these findings, we are still unable to fully explain the high temperature sensitivity of isoprene emissions from high latitude ecosystems.

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“…Moreover, some conifer species possessed leaf tissues that serve as storage organs for substances, like resin ducts and oil glands. Terpenoids of certain types were stored therein and were released upon heat stress-induced damage to these organs [70][71][72], rather than being emitted immediately after synthesis. The emission rates of these BVOCs are influenced by diffusion processes, with temperature being the primary driver, rather than being directly related to other environmental and physiological factors.…”

Section: The Relationship Between Isoprenoid Emission and Physiologic...mentioning

confidence: 99%

Emission Pattern of Biogenic Volatile Organic Compounds from Wetland Vegetation

Chen,

Wang,

et al. 2024

Atmosphere

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Biogenic volatile organic compounds (BVOCs) significantly contribute to atmospheric chemistry at both regional and global scales. The composition and intensity of BVOC emissions vary significantly among different plant species. Previous studies have focused on BVOC emissions from tree species, but the results of research on BVOC emissions from wetland plants are still limited. Therefore, in this study, BVOCs emitted by three aquatic plants (Phragmites australis, Typha angustifolia, and Iris pseudacorus) were sampled and analyzed using a dynamic headspace technique combined with GC-MS at daily scales. The diurnal observation data showed that the total BVOC emission rates of the three plants peaked with the increase in environmental factors (temperature, PAR, and water temperature). P. australis was the only of the three plants that emitted isoprene with a high rate of 48.34 μg·g−1Dw·h−1. Moreover, the peak emission rates of total BVOC (78.45 μg·g−1Dw·h−1) in P. australis were higher than most tree species. The emissions rates of volatile organic compounds, including monoterpenes, oxygenated volatile organic compounds, alkanes, and other volatile organic compounds, were statistically correlated across all species. The emission rates of isoprene from P. australis had significant associations with intercellular CO2 concentration (Ci) (0.58, p < 0.05) and transpiration rate (Tr) (−0.63, p < 0.01). The emission rates of monoterpenes from P. australis were found to have a significantly positive correlation with the net photosynthetic rate (Pn) (0.58, p < 0.05) while T. angustifolia (−0.59, p < 0.05) and I. pseudacorus (−0.47, p < 0.05) showed the opposite trend. Such findings hold significance for the refinement of localized emission inventories and the development of comprehensive emission process models in future research, as BVOC emissions from wetland plants were reported here for the first time.

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Heat stress strongly induces monoterpene emissions in some plants with specialized terpenoid storage structures

Cited by 12 publications

References 47 publications

Leaf-Level Bidirectional Exchange of Formaldehyde on Deciduous and Evergreen Tree Saplings

Leaf-Level Bidirectional Exchange of Formaldehyde on Deciduous and Evergreen Tree Saplings

Arctic Heatwaves Could Significantly Influence the Isoprene Emissions From Shrubs

Emission Pattern of Biogenic Volatile Organic Compounds from Wetland Vegetation

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