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Photosynthetic characteristics and monoterpenes emission are related to foliage ontogeny in Cinnamomum camphora(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2019 01
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Photosynthetic characteristics and monoterpenes emission are related to foliage ontogeny in Cinnamomum camphora
SHANG Tianqi & SUN Zhihong**
Institute of Forestry and Biotechnology, Zhejiang Agriculture and Forestry University, Hangzhou 311300, China
non-rectangular hyperbola model Farquhar model photosynthetic electron transport carbon dioxide carboxylation efficiency plant biogenic volatile organic compounds (BVOCs) landscape plant

Plant biogenic volatile organic compounds (BVOCs) emission is driven by environmental factors and ontogeny stages. Cinnamomum camphora, an evergreen tree species widely distributed and used for urban greening in south of China, emits multiple BVOCs, including monoterpenes. However, the regulation of how photosynthetic physiology affects monoterpenes emission is poorly understood. In this study, we investigated the photosynthetic characteristics and monoterpenes emission of C. camphora under three foliar ontogeny stages—young, mature, and old—to gain insight into whether a direct regulatory relationship exists between monoterpenes emission and photosynthetic CO2 assimilation. The photosynthetic characteristics were estimated by a light/CO2 response curve using the non-rectangular hyperbola and Farquhar photosynthesis model. All monoterpenes emission parameters were estimated by using the Guenther BVOCs emission model. The main monoterpenes emitted from C. camphora were careen and ocimene. The parameters of net photosynthesis rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), and intercellular CO2 concentration (Ci) were significantly different in the three foliar ontogeny stages, when measured under standard conditions, and the highest and lowest values of these parameters were found in the mature and old foliage, respectively. However, the highest total monoterpenes emission rate (E) was found in the young foliage and the lowest emission rate in the mature foliage. The response tendency of total monoterpenes emission with light intensity was similar to photosynthesis-light intensity response curves under all three foliar ontogeny stages, while the response to CO2 concentration were no significant impacts on total monoterpenes emission. The mature foliage had the highest initial quantum efficiency (α), maximum net photosynthetic rate (Pnmax), maximum carboxylase activity of Rubisco (Vcmax), respiration rate under light (Rp), and light saturation point (LSP). However, the highest values of the light compensation point (LCP) and dark respiration rate (Rd) were found in the young foliage. The highest value of the capacity of photosynthetic electron transport (Jmax) and the lowest value of the capacity of Vcmax were found in old foliage. This meant that old foliage had the lowest light energy utilization and there was excess light energy under strong light, which was probably also a regulatory mechanism for the evergreen plants to use excess light energy to maintain a certain temperature to overwinter. The highest maximum monoterpenes emission rate (Emax) and the lowest apparent quantum efficiency(β) for total monoterpenes emission were found in young foliage; however, the lowest Emax and the highest apparent quantum efficiency (β) and true quantum yield (βT) and for total monoterpenes emission were found in mature foliage. We conclude that monoterpenes emission from C. camphora is mainly dependent on foliage ontogeny; however, the emission rate was significantly affected by light response, but not by CO2 concentration, indicating that the total monoterpene emission could be regulated by energy and carbon source supply during the growth process and also influenced by the changes of environmental factors in different seasons. This study will be useful in precisely determining the emission parameters for a regional model in BVOCs emission estimation.


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