Long-term dynamics of monoterpene synthase activities, monoterpene storage pools and emissions in boreal Scots pine

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http://hdl.handle.net/10138/241227

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Vanhatalo , A , Ghirardo , A , Juurola , E , Schnitzler , J-P , Zimmer , I , Hellen , H , Hakola , H & Baeck , J 2018 , ' Long-term dynamics of monoterpene synthase activities, monoterpene storage pools and emissions in boreal Scots pine ' , Biogeosciences , vol. 15 , no. 16 , pp. 5047-5060 . https://doi.org/10.5194/bg-15-5047-2018

Title: Long-term dynamics of monoterpene synthase activities, monoterpene storage pools and emissions in boreal Scots pine
Author: Vanhatalo, Anni; Ghirardo, Andrea; Juurola, Eija; Schnitzler, Joerg-Peter; Zimmer, Ina; Hellen, Heidi; Hakola, Hannele; Baeck, Jaana
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Doctoral Programme in Atmospheric Sciences
Date: 2018-08-24
Language: eng
Number of pages: 14
Belongs to series: Biogeosciences
ISSN: 1726-4170
URI: http://hdl.handle.net/10138/241227
Abstract: Seasonal variations in monoterpene emissions from Scots pine (Pinus sylvestris) are well documented, and emissions are often shown to follow the incident temperatures due to effects on compound volatility. Recent studies have indicated a link between monoterpene emissions and physiological drivers such as photosynthetic capacity during needle development. The complex interplay between the dynamic changes in the biosynthetic capacity to produce monoterpenes and the temperature-dependent evaporation process of volatiles from internal storage reservoirs has not yet been studied under field conditions. In this study, we analysed the relationships between needle monoterpene synthase activities, endogenous monoterpene storage pools and monoterpene emissions of needles in two consecutive years at a boreal forest site in Finland. The results showed changes in the monoterpene synthase activity of needles, linked to seasonality and needle ontogenesis, while the pool of stored monoterpenes (about 0.5% of dry weight) did not change considerably as a function of needle aging. Monoterpene emissions did not correlate directly with enzyme activity or the storage pool size. We observed notably high plant-to-plant variation in the biosynthesis rates of individual monoterpenes, which did not reflect the storage compound mixture. The enzyme activity producing delta-3-carene was only present in the first months after needle flushing, and decreased with needle age, whereas delta-3-carene was abundant in the endogenous monoterpene pool and dominated the needle emissions. This study emphasizes the seasonal, developmental and intraspecific variability of monoterpene biosynthesis and storage, and calls for more in-depth analyses to reveal how such complex interaction affects monoterpene emissions from pine needles in boreal forests.
Subject: VOLATILE ORGANIC-COMPOUNDS
METHYLERYTHRITOL 4-PHOSPHATE PATHWAY
ABIES L. KARST.
ISOPRENOID BIOSYNTHESIS
PLANT VOLATILES
QUERCUS-ILEX
ISOPENTENYL DIPHOSPHATE
SEASONAL-VARIATION
LEAVES
TEMPERATURE
4112 Forestry
1172 Environmental sciences
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