title: Measurement of ethylene emission from Japanese red pine (Pinus densiflora) under field conditions in NOx-polluted areas.
abstract: Emission of ethylene from the needles of Japanese red pine, Pinus densiflora, was measured in air-polluted areas in Hiroshima, Japan. We applied a suitable protocol to determine the rate of ethylene emission from the excised needles. The influence of excision of needles on ethylene emission was not detected during the first 4 h of incubation at 20 degrees C. Ethylene emissions were low in the unpolluted (clean) areas regardless of the altitude or season. The emission of stress ethylene increased with the atmospheric NO2 concentration, suggesting that atmospheric NOx or related substances induced the higher ethylene emission in the polluted areas (near urban and industrial areas). In all cases, 1-year-old needles emitted significantly larger amounts of ethylene than the current needles. Ethylene emission did not increase evenly in the polluted areas, but the frequency of trees emitting high ethylene increased. Therefore, threshold rates for the baseline ethylene emission were proposed.
authors.affiliation: Center for Forest Decline Studies, Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan. akume@attglobal.net
authors.forename: A
authors.initials: A
authors.lastname: Kume
authors.forename: N
authors.initials: N
authors.lastname: Tsuboi
authors.forename: N
authors.initials: N
authors.lastname: Nakatani
authors.forename: K
authors.initials: K
authors.lastname: Nakane
authors.forename: N
authors.initials: N
authors.lastname: Sakurai
authors.forename: N
authors.initials: N
authors.lastname: Nakagawa
authors.forename: H
authors.initials: H
authors.lastname: Sakugawa
mesh_terms: D000393:Air Pollutants / Q000009:adverse effects / Q000032:analysis*; D000704:Analysis of Variance; D005030:Ethylenes / Q000378:metabolism*; D007564:Japan; D016015:Logistic Models; D009589:Nitrogen Oxides / Q000009:adverse effects / Q000032:analysis*; D018515:Plant Leaves / Q000187:drug effects* / Q000378:metabolism; D018521:Plant Physiological Phenomena / Q000187:drug effects; D014197:Trees / Q000187:drug effects* / Q000378:metabolism
chemical_list: D000393:Air Pollutants; D005030:Ethylenes; D009589:Nitrogen Oxides; C036216:ethylene