Effects of allelochemicals on plant respiration and oxygen isotope fractionation by the alternative oxidase |
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Authors: | Josep Peñuelas Miquel Ribas-Carbo Larry Giles |
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Affiliation: | (1) Centre de Recerca Ecològica i Aplicacions Forestals (CREAF) Facultat Ciències, Universitat Autònoma, 08193 Bellaterra (Barcelona), Spain;(2) Botany Department, Duke University, 27708 Durham, North Carolina |
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Abstract: | The goal of this investigation was to determine the effects of allelochemicals on plant respiration that thereby may be responsible for their role in growth inhibition. We have tested the effects of juglone, quercetin, cinnamic acid, and-pinene on respiration rates, and electron partitioning through the cytochrome and alternative respiratory pathways, by measuring on-line oxygen consumption and oxygen isotope fractionation in soybean cotyledon tissue. Cinnamic acid and-pinene decreased the oxygen consumption rate and increased the relative partitioning of electron transport to the alternative pathway. Possible biochemical mechanisms of these effects are discussed. |
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Keywords: | Allelopathy alternative oxidase /content/j8ql7482570600mn/xxlarge945.gif" alt=" agr" align=" BASELINE" BORDER=" 0" >-pinene cinnamic acid juglone on-line18O fractionation quercetin respiration soybean |
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