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

✍ Scribed by D. A. Morris

Publisher
Springer-Verlag
Year
1979
Tongue
English
Weight
270 KB
Volume
146
Category
Article
ISSN
0032-0935

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✦ Synopsis

The velocity of exogenous indol-3yl-acetic acid ([1-(14)C]IAA) transport from the apical buds of intact pea, sunflower and cotton plants was determined from 0.5Β° C to 47Β° C. The minimum temperature at which transport occurred varied from 2Β° C (pea and sunflower) to 7Β° C (cotton). Above these temperatures the velocity of transport increased steadily to maxima near 44Β° 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 15Β° C and 30Β° C).Arrhenius plots for the chilling-sensitive cotton and sunflower plants exhibited abrupt discontinuities at 14.6Β° C and 8.7Β° 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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