Department of Biology, The University, Building 44, SO9 5NH, Southampton, U.K..
Planta. 1979 Oct;146(5):603-5. doi: 10.1007/BF00388839.
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 0.5° 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.
从 0.5°C 到 47°C 测定了完整豌豆、向日葵和棉花植株顶芽中外源吲哚-3-乙酸 ([1-(14)C]IAA) 运输的速度。发生运输的最低温度从 2°C（豌豆和向日葵）到 7°C（棉花）不等。在这些温度以上，运输速度稳定增加，在所有三种物种中都接近 44°C 达到最大值。进一步提高温度会导致运输完全停止，这表明生长素运输系统突然在高温下崩溃。根据 Arrhenius 图计算的运输速度的温度系数 (Q10) 较低（在 15°C 和 30°C 之间为 1.36 到 1.41）。对易受冷害的棉花和向日葵植物的 Arrhenius 图在分别为 14.6°C 和 8.7°C 处显示出突然的不连续性。易受冷害的豌豆的 Arrhenius 图在发生运输的整个温度范围内没有这种不连续性。
