The Effects of Low Growth and Measurement Temperature on the Respiratory Properties of Five Temperate Species |
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Authors: | COLLIER DONALD E; CUMMINS W RAYMOND |
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Institution: | Department of Botany, J. Tuzo Wilson Research Laboratories, Erindale College, University of Toronto Mississauga, Ontario L5L IC6, Canada |
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Abstract: | Five temperate ruderal species, Epilobium glandulosum, Matricariamatricariodes, Melilotus alba, Sonchus asper and Taraxacum officinale,were grown under controlled conditions at both 10 °C and20 °C. Respiration was measured at 10 °C and 20 °C.Total dark respiration rates of plants grown at 10 °C wereconsistently higher than the rates of plants grown at 20 °C.This was due to greater respiratory activity along both thecytochrome (KCN-sensitive) and alternative (SHAM-sensitive)pathways in the cold grown plants. The capacity to use the alternativepathway was also greater in the 10 °C grown plants. Theincrease in the relative contribution of each pathway was speciesspecific. At a given growth temperature the activity of thealternative pathway varied little between measurements at 10°C and 20 °C. In contrast, the activity of the cytochromepathway was greater when measured at 20 °C than when itwas measured at 10 °C. The capacity of the alternative pathwaywas lower when measured at 10 °C. These results suggestthat the cytochrome pathway is more sensitive to temperaturestress than is the alternative pathway. Alternative pathway, cyanide resistance, cytochrome pathway, respiration, temperature |
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