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Compensatory changes in ion fluxes into barley hordeum vulgare cultivar betzes seedlings in response to differential root shoot growth temperature


Compensatory changes in ion fluxes into barley hordeum vulgare cultivar betzes seedlings in response to differential root shoot growth temperature



Journal of Experimental Botany 34(149): 1711-1719



ISSN/ISBN: 0022-0957

The effect of growth temperature on the short term influx of 86Rb+/K+, 36Cl-/Cl-, 36ClO3-/NO3-, 45Ca2+/Ca2+ and 35SO42/SO42 into barley plants was examined. When barley plants were grown with a differential root:shoot temperature (15.degree. C/25.degree. C) there was a marked stimulation of influx of all ions except Ca2+. Q10 measurements were close to 2.0 for all ions except Ca2+, where Q10 .apprx. 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 NO3- uptake was affected by growth temperature. On exposure to 15.degree. C NO3- efflux/influx fell initially but was restored after 5 days. Sensitivity of net NO3- uptake to NH4+ 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 NO3- uptake is discussed.

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Accession: 005017710

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