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. 1983 Dec;73(4):1013–1019. doi: 10.1104/pp.73.4.1013

Ethylene Production by Auxin-Deprived, Suspension-Cultured Pear Fruit Cells in Response to Auxins, Stress, or Precursor

Rolf Puschmann 1,1, Roger Romani 1,2
PMCID: PMC1066598  PMID: 16663320

Abstract

Auxin-deprived, mannitol-supplemented, suspension-cultured pear (Pyrus communis L. Passe Crassane) fruit cells produce large quantities (20-40 nanoliters ethylene per 106 cells per hour) of ethylene in response to auxins, CuCl2 or 1-amino-cyclopropane-1-carboxylic acid (ACC). Maximum rates of production are achieved about 12 hours after the addition of optimal amounts of indoleacetic acid (IAA), naphthalene acetic acid (NAA), 2,4-dichlorophenoxyacetic acid (2,4-D), 4 to 5 hours after the addition of CuCl2 and 1 to 2 hours after the addition of ACC. Supraoptimal concentrations of IAA result in a lag phase followed by a normal response. High concentrations of NAA and 2,4-D result in an early (4-5 hours) stress response and injury.

Continuous protein and RNA synthesis are essential for elaboration of the full IAA response; only protein synthesis is necessary for the response to CuCl2 and ACC. Based on polysomal states and rates of amino acid incorporation, CuCl2 partially inhibits protein synthesis while nonetheless stimulating ethylene production. In general, ethylene production by the pear cells resembles that of other plant systems. Some differences may reflect the sensitivity of the cells and are discussed. The relatively high levels of ethylene produced and the experimental convenience of the cultured cells should make them especially suitable for further investigations of ethylene production and physiology.

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Selected References

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