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![Net photosynthesis (An), dark respiration (Rd), stomatal conductance (gs) and intercellular [CO2] (Ci) of E. grandis](profile/Gabriela-Posse/publication/292336545/figure/tbl1/AS:844792044982273@1578425527807/Net-photosynthesis-An-dark-respiration-Rd-stomatal-conductance-gs-and.png)
Net photosynthesis (An), dark respiration (Rd), stomatal conductance (gs) and intercellular [CO2] (Ci) of E. grandis
Source publication
Eucalyptus species are strong source of isoprenoid emission. The objective of the present study was to estimate isoprenoid emissions from Eucalyptus grandis forest crops in the Entre Rios province in the Mesopotamia region of Argentina. The emission rates of isoprene and monoterpenes were measured on individual leaves under; controlled environmenta...
Contexts in source publication
Context 1
... energy budget also takes into account energy lost through thermal radiation, by heat flow due to the difference between the leaf and ambient air, and by transpiration. To calculate transpiration the measured stomatal conductance (Table 1) was used, and its variation in response to PPFD was estimated using a rectangular hyperbola (Jarvis, 1976;Baldocchi et al., 1987). The energy budget equation is solved by iterative application of the Newton-Raphson method (Dai et al., 2004;Steinbrecher et al., 2009). ...Similar publications
Eucalyptus species are strong source of isoprenoid emission. The objective of the present study was to estimate isoprenoid emissions from Eucalyptus grandis forest crops in the Entre Rios province in the Mesopotamia region of Argentina. The emission rates of isoprene and monoterpenes were measured on individual leaves under; controlled environmenta...
Citations
... The main application of gas chromatography is to test the purity of substance and separation of different compounds from a complex mixture of chemicals (Donald, 2006). In the traditional drying method, due to the high temperature, there is an issue and release of the volatile organic compounds (VOCs) which are responsible for many environmental problems, such as the formation of tropospheric ozone, photochemical smog, as well as cause olfactory discomfort of residents (Albuquerque, 2007;Ras-Mallorquí et al., 2007; Different plant species e.g., Eucalyptus and Spearmint are a robust cause of volatiles, e.g., isoprenoid release (Richter et al., 2016), so the study of these volatiles (VOCs) was necessary. Therefore, present research work was conducted to collect volatile compounds/bio ingredients by using three different distillation methods, which were released to the atmosphere in the drying process of the Eucalyptus (Eucalyptus citriodora) and Spearmint (Mentha spicata) leaves and analyze them qualitatively and quantitatively using gas chromatography with flame ionization detector (GC-FID). ...
This work was aimed to determine the moisture content from Eucalyptus (Eucalyptus Citriodora) and Spearmint (Mentha spicata) leaves, as well as qualitative and quantitative analysis of volatile organic compounds (VOCs), released during the drying process. Sun and oven drying were used to determine the moisture content from the Eucalyptus and Spearmint leaves. Controlled, Solar, and Soxhlet distillation systems used to collect the volatile organic compounds (VOCs) from the fresh and dried leaves. Gas chromatography (GC) used to perform the qualitative and quantitative analysis of the VOCs. The result showed that the moisture contents of the Eucalyptus leaves were 53% and 56.2%, and Spearmint leaves were 62.5% and 77.3%, respectively. Furthermore, GC analysis using controlled and solar distillation systems for fresh leaves 14 and 10 (from Eucalyptus), and 6 and 4 (from Spearmint) volatiles were detected respectively whereas, soxhlet distillation system for dried leaves 4 and 4 volatiles were found only from both plants. The considerable difference in the number of volatiles from fresh and dried leaves is due to the missing volatiles were released during the drying process for becoming atmospheric pollutants as well as human toxicity and also resulted in the loss of functional properties of products e.g., nutritional and medicinal values. So, we conclude that the methodology adopted in this study is ample to collect and determine the volatiles/bio ingredients from the different perishable plants, as well as quantify and qualify each biochemical compound among the volatiles.
Keywords: Volatiles, Perishable plants, Eucalyptus, Spearmint, Drying, Distillation, Gas chromatography
This commentary paper from the recently formed International Global Atmospheric Chemistry (IGAC) Southern Hemisphere Working Group outlines key issues in atmospheric composition research that particularly impact the Southern Hemisphere. In this article, we present a broad overview of many of the challenges for understanding atmospheric chemistry in the Southern Hemisphere, before focusing in on the most significant factors that differentiate it from the Northern Hemisphere. We present sections on the importance of biogenic emissions and fires in the Southern Hemisphere, showing that these emissions often dominate over anthropogenic emissions in many regions. We then describe how these and other factors influence air quality in different parts of the Southern Hemisphere. Finally, we describe the key role of the Southern Ocean in influencing atmospheric chemistry and conclude with a description of the aims and scope of the newly formed IGAC Southern Hemisphere Working Group.
Eucalypts are major emitters of biogenic volatile organic compounds (BVOCs), especially volatile isoprenoids. Emissions and incorporation of 13C in BVOCs were measured in Eucalyptus camaldulensis branches exposed to rapid heat stress or progressive temperature increases, in order to detect both metabolic processes and their dynamics. Isoprene emission increased and photosynthesis decreased with temperatures rising from 30 up to 45 °C, and an increasing percentage of unlabeled carbon was incorporated into isoprene in heat‐stressed leaves. Intramolecular labeling was also incomplete in isoprene emitted by heat‐stressed leaves, suggesting increasing contribution of respiratory (and possibly also photorespiratory) carbon. At temperature above 45 °C, a drop of isoprene emission was mirrored by the appearance of unlabeled monoterpenes, green leaf volatiles, methanol, and ethanol, indicating that the emission of stored volatiles was mainly induced by cellular damage. Emission of partially labeled acetaldehyde was also observed at very high temperatures, suggesting a double source of carbon, with a large unlabeled component likely transported from roots and associated to the surge of transpiration at very high temperatures. Eucalypt plantations cover large areas worldwide, and our findings may dramatically change forecast and modelling of future BVOC emissions at planetary level, especially considering climate warming and frequent heat waves.
