2020
DOI: 10.1111/gcb.15213
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Stimulation of isoprene emissions and electron transport rates as key mechanisms of thermal tolerance in the tropical species Vismia guianensis

Abstract: Tropical forests absorb large amounts of atmospheric CO2 through photosynthesis, but high surface temperatures suppress this absorption while promoting isoprene emissions. While mechanistic isoprene emission models predict a tight coupling to photosynthetic electron transport (ETR) as a function of temperature, direct field observations of this phenomenon are lacking in the tropics and are necessary to assess the impact of a warming climate on global isoprene emissions. Here we demonstrate that in the early su… Show more

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Cited by 23 publications
(25 citation statements)
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References 102 publications
(157 reference statements)
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“…2), which agrees with the previous observation of a positive correlation between PHT and abundance of saturated fatty acids that promote membrane stability (Zhu et al ., 2018). Other processes not studied here, such as production of isoprenes and heat shock proteins, also may contribute to heat acclimation (Sharkey, 2005; Teskey et al ., 2015; Aspinwall et al ., 2019; Pollastrini et al ., 2019; Taylor et al ., 2019; Rodrigues et al ., 2020). Future studies including these processes may offer greater insight into their direct effects on the among‐species variation in PHT and its acclimation capacity in tropical trees.…”
Section: Discussionmentioning
confidence: 99%
“…2), which agrees with the previous observation of a positive correlation between PHT and abundance of saturated fatty acids that promote membrane stability (Zhu et al ., 2018). Other processes not studied here, such as production of isoprenes and heat shock proteins, also may contribute to heat acclimation (Sharkey, 2005; Teskey et al ., 2015; Aspinwall et al ., 2019; Pollastrini et al ., 2019; Taylor et al ., 2019; Rodrigues et al ., 2020). Future studies including these processes may offer greater insight into their direct effects on the among‐species variation in PHT and its acclimation capacity in tropical trees.…”
Section: Discussionmentioning
confidence: 99%
“…Internal standards of lauric-D 23 -acid ($98%, Sigma Aldrich) and 13 C 6 -adipic acid (99%, Cambridge Isotope Laboratories, Inc.) were used to correct for any loss of analyte during the analysis sequence of thermal desorption, derivatization, sample transfer, and ionization. This approach improved the precision of quantitative analysis for the TD-GC-MS system.…”
Section: Analysis By Thermal Desorption Gas Chromatography Mass Spectrometry (Td-gc-ms)mentioning
confidence: 99%
“…Several different antioxidant pathways are associated with isoprene, such as the consumption of the excess products of photosynthesis (i.e., ATP and NADPH) through a tight coupling of isoprene biosynthesis with photochemical electron transport, direct antioxidant reactions between isoprene and reactive oxygen species, and the enhancement of the physical stability of membranes. 8,13,14 Pyruvate-2-13 C leaf and branch feeding experiments show that methyl vinyl ketone (MVK) and methacrolein (MACR) can be emitted from plants to the atmosphere. 8 These species had previously been considered as produced through the atmospheric oxidation of isoprene.…”
Section: Introductionmentioning
confidence: 99%
“…For example, in the "hyperthermophile" early successional species Vismia guianensis in the central Amazon, electron transport rates (ETR) increased with temperature in concert with isoprene emissions (a primary product of photosynthesis), even as reductions in g s constrained P n . 17 However, the magnitude and direction of g s acclimation to temperature is inconsistent across species and conditions, with higher growth temperatures enhancing g s in the thermophilic tree Zizphus spinachristi 18 while g s suppression under higher growth temperatures was reported in Ulmus americana 19 and Populus x euramericana. 20 Heat waves coupled with drought further suppressed g s in Robinia pseudoacacia and Pseudotsuga menziesii.…”
Section: Introductionmentioning
confidence: 99%
“…However, the optimum temperature of ETR will be stimulated as well as the emissions of isoprene through the utilization of products of the light reactions. 17 Moreover, downstream pathways involved in secondary metabolite biosynthesis will also alter under HGT.…”
Section: Introductionmentioning
confidence: 99%