The effect of temperature on the velocity of exogenous auxin transport in intact chilling-sensitive and chilling-resistant plants |
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Authors: | D A Morris |
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Institution: | (1) Department of Biology, The University, Building 44, SO9 5NH Southampton, U.K. |
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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.Abbreviation IAA
indol-3yl-acetic acid |
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Keywords: | Auxin transport Chilling sensitivity Membrane viscosity |
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