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Plant Cell Environ

Title:		Transpiration directly regulates the emissions of water-soluble short-chained OVOCs
Author(s):		Rissanen K; Holtta T; Back J;
Address:		"Institute for Atmospheric and Earth System Research/Forest Sciences, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, FIN-00014, Finland"
Journal Title:		Plant Cell Environ
Year:		2018
Volume:		20180712
Issue:		10
Page Number:		2288 - 2298
DOI:		10.1111/pce.13318
ISSN/ISBN:		1365-3040 (Electronic) 0140-7791 (Linking)
Abstract:		"Most plant-based emissions of volatile organic compounds are considered mainly temperature dependent. However, certain oxygenated volatile organic compounds (OVOCs) have high water solubility; thus, also stomatal conductance could regulate their emissions from shoots. Due to their water solubility and sources in stem and roots, it has also been suggested that their emissions could be affected by transport in the xylem sap. Yet further understanding on the role of transport has been lacking until present. We used shoot-scale long-term dynamic flux data from Scots pines (Pinus sylvestris) to analyse the effects of transpiration and transport in xylem sap flow on emissions of 3 water-soluble OVOCs: methanol, acetone, and acetaldehyde. We found a direct effect of transpiration on the shoot emissions of the 3 OVOCs. The emissions were best explained by a regression model that combined linear transpiration and exponential temperature effects. In addition, a structural equation model indicated that stomatal conductance affects emissions mainly indirectly, by regulating transpiration. A part of the temperature's effect is also indirect. The tight coupling of shoot emissions to transpiration clearly evidences that these OVOCs are transported in the xylem sap from their sources in roots and stem to leaves and to ambient air"
Keywords:		Acetaldehyde/metabolism Acetone/metabolism Methanol/metabolism Pinus sylvestris/metabolism/physiology Plant Shoots/metabolism Plant Transpiration/*physiology Volatile Organic Compounds/*metabolism Water/metabolism Xylem/metabolism acetaldehyde acetone lon;
Notes:		"MedlineRissanen, K Holtta, T Back, J eng Research Support, Non-U.S. Gov't 2018/04/21 Plant Cell Environ. 2018 Oct; 41(10):2288-2298. doi: 10.1111/pce.13318. Epub 2018 Jul 12"