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Title:		Root anoxia effects on physiology and emissions of volatile organic compounds (VOC) under short- and long-term inundation of trees from Amazonian floodplains
Author(s):		Bracho-Nunez A; Knothe NM; Costa WR; Maria Astrid LR; Kleiss B; Rottenberger S; Piedade MT; Kesselmeier J;
Address:		"Max Planck Institute for Chemistry, Hahn-Meitner-Weg 1, 55128 Mainz, Germany"
Journal Title:		Springerplus
Year:		2012
Volume:		20120727
Issue:
Page Number:		9 -
DOI:		10.1186/2193-1801-1-9
ISSN/ISBN:		2193-1801 (Print) 2193-1801 (Electronic) 2193-1801 (Linking)
Abstract:		"Volatile organic compound (VOC) emissions are affected by a variety of biotic and abiotic factors such as light intensity, temperature, CO2 and drought. Another stress factor, usually overlooked but very important for the Amazon region, is flooding. We studied the exchange of VOCs in relation to CO2 exchange and transpiration of 8 common tree species from the Amazonian floodplain forest grown up from seeds using a dynamic enclosure system. Analysis of volatile organics was performed by PTR-MS fast online measurements. Our study confirmed emissions of ethanol and acetaldehyde at the beginning of root anoxia after inundation, especially in less anoxia adapted species such as Vatairea guianensis, but not for Hevea spruceana probably due to a better adapted metabolism. In contrast to short-term inundation, long-term flooding of the root system did not result in any emission of ethanol or/and acetaldehyde. Emission of other VOCs, such as isoprenoids, acetone, and methanol exhibited distinct behavior related to the origin (igapo or varzea type of floodplain) of the tree species. Also physiological activities exhibited different response patterns for trees from igapo or varzea. In general, isoprenoid emissions increased within the course of some days of short-term flooding. After a long period of waterlogging, VOC emissions decreased considerably, along with photosynthesis, transpiration and stomatal conductance. However, even under long-term testing conditions, two tree species did not show any significant decrease or increase in photosynthesis. In order to understand ecophysiological advantages of the different responses we need field investigations with adult tree species"
Keywords:		Amazonian trees Floodplains Igapo Photosynthesis Short and long-term inundation Volatile Organic Compounds Varzea Waterlogging;
Notes:		"PubMed-not-MEDLINEBracho-Nunez, Araceli Knothe, Nina Maria Costa, Wallace R Maria Astrid, Liberato R Kleiss, Betina Rottenberger, Stefanie Piedade, Maria Teresa Fernandez Kesselmeier, Jurgen eng Switzerland 2012/01/01 Springerplus. 2012 Jul 27; 1:9. doi: 10.1186/2193-1801-1-9. eCollection 2012"