Tracer experiment using 42K+ and 137Cs+ revealed the different transport rates of potassium and caesium within rice roots
Natsuko I. Kobayashi A , Ryohei Sugita A , Tatsuya Nobori A B , Keitaro Tanoi A C and Tomoko M. Nakanishi A
+ Author Affiliations
- Author Affiliations
A Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1–1–1 Yayoi, Bunkyo-ku, Tokyo 113–8657, Japan.
B Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Carl-von-Linne Weg 10, 50829 Cologne, Germany.
C Corresponding author. Email: uktanoi@mail.ecc.u-tokyo.ac.jp
Functional Plant Biology 43(2) 151-160 https://doi.org/10.1071/FP15245
Submitted: 17 August 2015 Accepted: 3 November 2015 Published: 15 December 2015
Abstract
The differences in the transport characteristics in planta between potassium (K+) and caesium (Cs+) was investigated using their radionuclides, 42K+ and 137Cs+. A tracer experiment using nutrient solutions supplemented with 42K and 137Cs revealed that the ratio of the root’s K+ uptake rate to its Cs+ uptake rate was 7–11 times higher than the K+ : Cs+ concentration ratio in the solution, and the number was varied depending on the K concentration in the solution and also on the growth condition. After entering through the root tissues, the 42K+ : 137Cs+ ratio in the shoots was 4.28 times higher than the value in the roots. However, the 42K+ : 137Cs+ ratio in each leaf did not differ significantly, indicating that the primary transport of K+ and Cs+ in the shoots are similarly regulated. In contrast, among the radionuclides stored in the roots over 4 h, 30% of the 42K+ was exported from the roots over the following hour, whereas only 8% of 137Cs+ was exported. In addition, within the xylem, K+ was shown to travel slowly, whereas Cs+ passed quickly through the roots into the shoots. In conclusion, our study demonstrated very different transport patterns for the two ions in the root tissues.
Additional keywords: cesium, channel blocker, deficiency, ion uptake, live-imaging, selectivity.
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