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Diurnal and ultradian rhythms in K^+^ uptake by Trifolium repens under natural light patterns: Evidence for segmentation at different root temperatures by J. H. Macduff; M. S. Dhanoa is a Agricultural and Biological Sciences article available to read on EtoBox.

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The patterns and variability in the diurnal and ultradian fluctuations in net uptake of K^+^ by 85‐day‐old plants of white clover (__Trifolium repens__ L. cv. Huia) were analysed during 21 days of vegetative growth under natural light conditions, at constant root temperaures of 13 and 25°C. Plants were established in flowing solution culture, and hourly rates of K^+^ uptake from solutions containing 2.5‐6.5 μ__M__ K^+^ were automatically measured without physical disturbance. Total daily solar radiation ranged between 1.3 and 12.5 MJ m^−2^ day^−1^ over the 21 days of measurements. Substantial diurnal changes in rates of K^+^ uptake, both absolutely and proportionately, were recorded on all but the day of lowest radiation (day 19), during which there was a period of net efflux of K^+^ from the root system into the flowing nutrient solutions at both temperatures. Typically, uptake rates increased severalfold during the first half of the light period, followed by several hours of relative stability during the afternoon; then a rapid decline throughout the evening and first half of the night, and finally gradual decline during the second half of the night. The data from a sequence of t

Who reads Diurnal and ultradian rhythms in K^+^ uptake by Trifolium repens under natural light patterns: Evidence for segmentation at different root temperatures?

Author

J. H. Macduff; M. S. Dhanoa

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0031-9317)

Published

1996

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)