Thermotolerance of leaf discs from four isoprene-emitting species is not enhanced by exposure to exogenous isoprene

The effects of exogenously supplied isoprene on chlorophyll fluorescence characteristics were examined in leaf discs of four isoprene-emitting plant species, kudzu (Pueraria lobata [Willd.] Ohwi.), velvet bean (Mucuna sp.), quaking aspen (Populus tremuloides Michx.), and pussy willow (Salix discolor...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1999-07, Vol.120 (3), p.821-825
Main Authors: Logan, B.A, Monson, R.K
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
chlorophyll
Chlorophylls
Compressed air
Economic plant physiology
efficiency
Environmental and Stress Physiology
Fluorescence
Fundamental and applied biological sciences. Psychology
Heat tolerance
High temperature
isoprenoids
Kudzu
Leaves
light intensity
Metabolism
Mucuna
Net assimilation, photosynthesis, carbon metabolism. Photorespiration, respiration, fermentation (anoxia, hypoxia)
Nutrition. Photosynthesis. Respiration. Metabolism
Photosynthesis, respiration. Anabolism, catabolism
photosystem II
Plant physiology and development
Plants
Pollutant emissions
Populus tremuloides
Pueraria montana var. lobata
Salix
symptoms
temperature
thylakoids
Velvet
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Summary:The effects of exogenously supplied isoprene on chlorophyll fluorescence characteristics were examined in leaf discs of four isoprene-emitting plant species, kudzu (Pueraria lobata [Willd.] Ohwi.), velvet bean (Mucuna sp.), quaking aspen (Populus tremuloides Michx.), and pussy willow (Salix discolor Muhl). Isoprene, supplied to the leaves at either 18 microliter L(-1) in compressed air or 21 microliter L(-1) in N(2), had no effect on the temperature at which minimal fluorescence exhibited an upward inflection during controlled increases in leaf-disc temperature. During exposure to 1008 micromol photons m(-2) s(-1) in an N(2) atmosphere, 21 microliter L(-1) isoprene had no effect on the thermally induced inflection of steady-state fluorescence. The maximum quantum efficiency of photosystem II photochemistry decreased sharply as leaf-disc temperature was increased; however, this decrease was unaffected by exposure of leaf discs to 21 microliter L(-1) isoprene. Therefore, there were no discernible effects of isoprene on the occurrence of symptoms of high-temperature damage to thylakoid membranes. Our data do not support the hypothesis that isoprene enhances leaf thermotolerance.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.120.3.821