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Temperature threshold of isoprene emission from tropical trees, Ficus virgata and Ficus septica.
MedLine Citation:
PMID:  24080006     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
This paper describes the existence of temperature threshold in isoprene emission from tropical trees for the first time. Isoprene emission capacity of Ficus virgata leaves kept outdoors were measured over a period of 20d in the wintertime. When the plants experienced the low temperature below 12°C in the daytime, isoprene emission was completely suppressed, and re-activated by elevated temperature above the threshold of 12°C. Photosynthesis is also decreased similarly, but too much smaller extent compared to the reduction observed for isoprene emission. The cut off level of accumulated temperature to shut off the isoprene emission was roughly estimated to be 300 degree/d. The shut off in the isoprene emission by the low temperature was confirmed experimentally by use of phytotron with tropical trees of F. virgata and F. septica. Isoprene emission of both species ceased at 12°C, and re-activated by raising the temperature above the threshold level. Photosynthesis was lowered slightly as was the case for the field observation, and no close association between photosynthesis and isoprene emission was noted. The expression of isoprene synthase gene showed much greater variation after exposure to the cold temperature compared to those involved in photosynthesis. These observations therefore suggested the existence of putative direct connection between perception of temperature and isoprene emission in tropical trees, which may merit further investigation to estimate the net output of isoprene from subtropical or tropical forest.
Authors:
Hirosuke Oku; Masashi Inafuku; Tomonori Takamine; Maki Nagamine; Seikoh Saitoh; Masakazu Fukuta
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-9-27
Journal Detail:
Title:  Chemosphere     Volume:  -     ISSN:  1879-1298     ISO Abbreviation:  Chemosphere     Publication Date:  2013 Sep 
Date Detail:
Created Date:  2013-10-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013 Elsevier Ltd. All rights reserved.
Affiliation:
Tropical Biosphere Research Center, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan. Electronic address: okuhiros@comb.u-ryukyu.ac.jp.
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