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Water stress, temperature, and light effects on isoprene emission and photosynthesis of Kudzu leaves

Conference · · Plant Physiology; (United States)
OSTI ID:6284540
;  [1]
  1. Univ. of Wisconsin, Madison (United States)
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Kudzu (Pueraia lobata (Willd) Ohwi.) emits isoprene, a hydrocarbon which can significantly affect atmospheric chemistry. Isoprene emission under standard conditions of 1000 [mu]mol photons[center dot]M[sup [minus]2][center dot]S[sup [minus]1] and 30[degrees]C developed only after the leaf bad reached full expansion and was not maximal until up to two weeks past the point of full expansion of the leaf. Isoprene emission from kudzu was stimulated by increases in temperature and photon flux density (up to 3000 [mu]mol photons[center dot]m[sup [minus]2][center dot]s[sup [minus]1]). For unstressed plants, 20 % of the carbon fixed in photosynthesis was reemitted as isoprene at 1000 [mu]mol photons[center dot]m[sup [minus]2][center dot]S[sup [minus]1]. Following the relief of water stress, photosynthesis recovered to the prestress rate but isoprene emission increased up to five times the prestress rate. At 1000 [mu]mol photons[center dot]M[sup [minus]2][center dot]S[sup [minus]1] and 35[degrees]C, 67% of the carbon fixed in photosynthesis was reemitted as isoprene eight days after water stress. For some leaves the rate of isoprene emission exceeded 500 nmol[center dot]M[sup [minus]2][center dot]S[sup [minus]1], substantially higher than ever reported before. Leaves of plants grown at less than 20[degrees]C did not make isoprene until an inductive treatment was given. Withholding water from plants or keeping leaves at 30[degrees]C induced isoprene emission. The observation of rapid and dramatic changes in the rate of isoprene emission from leaves in response to water stress and temperature may indicate that isoprene emission improves the ability of plants to cope with these conditions. With the new information on temperature and water stress effects on isoprene emission we speculate on possible reasons for isoprene emission from plants.
OSTI ID:
6284540
Report Number(s):
CONF-9307119--
Conference Information:
Journal Name: Plant Physiology; (United States) Journal Volume: 102:1
Country of Publication:
United States
Language:
English

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Related Subjects

54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
ATMOSPHERIC CHEMISTRY
BIOLOGICAL STRESS
CHEMICAL EFFLUENTS
CHEMICAL REACTIONS
CHEMICAL WASTES
CHEMISTRY
DIENES
EMISSION
ENERGY
HEAT
HYDROCARBONS
HYDROGEN COMPOUNDS
ISOPRENE
LEAVES
NONRADIOACTIVE WASTES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
POLLUTION SOURCES
POLYENES
SYNTHESIS
TEMPERATURE DEPENDENCE
WASTES
WATER