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The effect of temperature on the velocity of exogenous auxin transport in intact chilling-sensitive and chilling-resistant plants

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Abstract

The velocity of exogenous indol-3yl-acetic acid ([1-14C]IAA) transport from the apical buds of intact pea, sunflower and cotton plants was determined from 0.5° C to 47° C. The minimum temperature at which transport occurred varied from 2° C (pea and sunflower) to 7° C (cotton). Above these temperatures the velocity of transport increased steadily to maxima near 44° C in all three species. Further increase in temperature resulted in a complete cessation of transport, suggesting a sudden high-temperature breakdown of the auxin transport system. Temperature coefficients (Q10) for transport velocity calculated from Arrhenius plots were low (1.36 to 1.41 between 15° C and 30° C).

Arrhenius plots for the chilling-sensitive cotton and sunflower plants exhibited abrupt discontinuities at 14.6° C and 8.7° C respectively. An Arrhenius plot for the chilling-resistant pea exhibited no such discontinuity over the whole temperature range at which transport occurred.

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Abbreviations

IAA:

indol-3yl-acetic acid

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Authors and Affiliations

  1. Department of Biology, The University, Building 44, SO9 5NH, Southampton, U.K.

    D. A. Morris

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  1. D. A. Morris
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Morris, D.A. The effect of temperature on the velocity of exogenous auxin transport in intact chilling-sensitive and chilling-resistant plants. Planta 146, 603–605 (1979). https://doi.org/10.1007/BF00388839

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  • DOI: https://doi.org/10.1007/BF00388839

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