Cyanide-resistant respiration in photosynthetic organs of freshwater aquatic plants. [Myriophyllum spicatum]

Azcon-Bieto, J; Murillo, J; Penuelas, J

Title: Cyanide-resistant respiration in photosynthetic organs of freshwater aquatic plants. [Myriophyllum spicatum]

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Abstract

The rate and sensitivity to inhibitors (KCN and salicylhydroxamic acid(SHAM)) of respiratory oxygen uptake has been investigated in photosynthetic organs of several freshwater aquatic plant species. The oxygen uptake rates on a dry weigh basis of angiosperm leaves were generally higher than those of the corresponding stems. Leaves also had a higher chlorophyll content than stems. Respiration of leaves and stems of aquatic angiosperms was generally cyanide-resistant. The cyanide resistance of respiration of whole shoots of two aquatic bryophytes and an alga was lower. These results suggested that the photosynthetic tissues of aquatic plants have a considerable alternative pathway capacity. The angiosperm leaves generally showed the largest alternative path capacity. In all cases, the respiration rate of the aquatic plants studied was inhibited by SHAM alone by about 13 to 31%. These results were used for calculating the actual activities of the cytochrome and alternative pathways. These activities were generally higher in the leaves of angiosperms. The basal oxygen uptake rate of Myriophyllum spicatum leaves was greatly increased by CCCP, either in the presence or in the absence of substrates. These results suggest that respiration was limited by the adenylate system, and not by substrate availability. The increase in themore »« less

Authors:: Azcon-Bieto, J; Murillo, J; Penuelas, J

Publication Date:: Wed Jul 01 00:00:00 EDT 1987

Research Org.:: Universitat de Barcelona, Spain

OSTI Identifier:: 6016691

Resource Type:: Journal Article

Journal Name:: Plant Physiol.; (United States)

Additional Journal Information:: Journal Volume: 84:3

Country of Publication:: United States

Language:: English

Subject:: 63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; 59 BASIC BIOLOGICAL SCIENCES; AQUATIC ORGANISMS; RESPIRATION; CYANIDES; BIOLOGICAL EFFECTS; TOLERANCE; ALGAE; BIOLOGICAL PATHWAYS; CHLOROPHYLL; CYTOCHROMES; INHIBITION; LEAVES; ORGANIC ACIDS; OXYGEN; PHOTOSYNTHESIS; PLANT STEMS; POTASSIUM COMPOUNDS; UPTAKE; ALKALI METAL COMPOUNDS; CARBOXYLIC ACIDS; CHEMICAL REACTIONS; ELEMENTS; HETEROCYCLIC ACIDS; HETEROCYCLIC COMPOUNDS; NONMETALS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; PHOTOCHEMICAL REACTIONS; PHYTOCHROMES; PIGMENTS; PLANTS; PORPHYRINS; PROTEINS; SYNTHESIS; 560300* - Chemicals Metabolism & Toxicology; 550200 - Biochemistry

Citation Formats


                    Azcon-Bieto, J, Murillo, J, and Penuelas, J. Cyanide-resistant respiration in photosynthetic organs of freshwater aquatic plants. [Myriophyllum spicatum].  United States: N. p., 1987. 
        Web.

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                    Azcon-Bieto, J, Murillo, J, & Penuelas, J. Cyanide-resistant respiration in photosynthetic organs of freshwater aquatic plants. [Myriophyllum spicatum].  United States.

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                    Azcon-Bieto, J, Murillo, J, and Penuelas, J. 1987.  
        "Cyanide-resistant respiration in photosynthetic organs of freshwater aquatic plants. [Myriophyllum spicatum]".  United States.

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@article{osti_6016691,

  title        = {Cyanide-resistant respiration in photosynthetic organs of freshwater aquatic plants. [Myriophyllum spicatum]},

  author       = {Azcon-Bieto, J and Murillo, J and Penuelas, J},

  abstractNote = {The rate and sensitivity to inhibitors (KCN and salicylhydroxamic acid(SHAM)) of respiratory oxygen uptake has been investigated in photosynthetic organs of several freshwater aquatic plant species. The oxygen uptake rates on a dry weigh basis of angiosperm leaves were generally higher than those of the corresponding stems. Leaves also had a higher chlorophyll content than stems. Respiration of leaves and stems of aquatic angiosperms was generally cyanide-resistant. The cyanide resistance of respiration of whole shoots of two aquatic bryophytes and an alga was lower. These results suggested that the photosynthetic tissues of aquatic plants have a considerable alternative pathway capacity. The angiosperm leaves generally showed the largest alternative path capacity. In all cases, the respiration rate of the aquatic plants studied was inhibited by SHAM alone by about 13 to 31%. These results were used for calculating the actual activities of the cytochrome and alternative pathways. These activities were generally higher in the leaves of angiosperms. The basal oxygen uptake rate of Myriophyllum spicatum leaves was greatly increased by CCCP, either in the presence or in the absence of substrates. These results suggest that respiration was limited by the adenylate system, and not by substrate availability. The increase in the respiratory rate by CCCP was due to a large increase in the activities of both the cytochrome and alternative pathways. The respiration rate of M. spicatum leaves in the presence of substrates was little inhibited by SHAM alone, but the SHAM-resistant rate (that is, the cytochrome path) was greatly stimulated by the further addition of CCCP. Similarly, the cyanide-resistant rate of O/sub 2/ uptake was also increased by the uncoupler.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/6016691},
  journal      = {Plant Physiol.; (United States)},
number       = ,

  volume       = 84:3,

  place        = {United States},

  year         = {Wed Jul 01 00:00:00 EDT 1987},

  month        = {Wed Jul 01 00:00:00 EDT 1987}

}

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