期刊
PLANT CELL AND ENVIRONMENT
卷 28, 期 3, 页码 278-286出版社
BLACKWELL PUBLISHING LTD
DOI: 10.1111/j.1365-3040.2004.01250.x
关键词
antioxidants; ascorbic acid; alpha-tocopherol; beta-carotene; fumigation; Fv/Fm; high temperatures; isoprene; monoterpenes; photosynthetic rates; thermotolerance; zeaxanthin
The purpose of the present study was to test the possible plant thermotolerance role of isoprene and to study its relationship with non-enzymatic antioxidants and terpene emissions. The gas exchange, chlorophyll fluorescence, extent of photo- and oxidative stress, leaf damage, mechanisms of photo- and antioxidant protection, and terpene emission were measured in leaves of Quercus ilex seedlings exposed to a ramp of temperatures of 5 degreesC steps from 25 to 50 degreesC growing with and without isoprene (10 muL L-1) fumigation. The results showed that isoprene actually conferred thermotolerance (shifted the decrease of net photosynthetic rates from 35 to 45 degreesC, increased F-v/F-m at 50 degreesC from 0.38 to 0.65, and decreased the leaf area damaged from 27 to 15%), that it precluded or delayed the enhancement of the antioxidant non-enzymatic defence conferred by alpha-tocopherol, ascorbic acid or beta-carotene consumption in response to increasing temperatures, and that it decreased by approximately 70% the emissions of monoterpenes at the highest temperatures. This suggests that there are inducible mechanisms triggered by the initial stages of thermal damage that up-regulate these antioxidant compounds at high temperatures and that these mechanisms are somehow suppressed in the presence of exogenous isoprene, which seems to already exert an antioxidant-like behaviour.
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