Abstract
The effect of growth temperature on the short term influx of 86Rb+/K+, 36C1~/C1~, 36C10i/NOj, 45Ca2+/Ca2+ and SO^/SOJ into barley plants (Hordeum vulgare L. cv. Betzes) has been examined. When barley plants were grown with a differential root:shoot temperature (15 °C/25 °C) there was a marked stimulation of influx of all ions except Ca2+. Qi0 measurements were close to 2-0 for all ions except Ca2+, where Q10 ~ 1-0 was found. Kinetics of ion influx showed that there had been almost complete compensation for the lower growing temperature over a range of concentrations. The regulation of NO] uptake was affected by growth temperature. On exposure to 15 °C NOj efflux/influx fell initially but was restored after 5 d. Sensitivity of net NO^ uptake to NH{ was increased by growth at a lower temperature. The importance of these observations in relation to application to field experiments and the proposed mechanism for NOj uptake is discussed.
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