Short day length-induced decrease of cesium uptake without altering potassium uptake manner in poplar

Abstract

Short day length-induced alteration of potassium (K) localization in perennial trees is believed to be a mechanism for surviving and adapting to severe winters. To investigate the relationship between cesium (Cs) and K localizations, a model tree poplar, hybrid aspen T89, was employed. Under short day length conditions, the amount of 137Cs absorbed through the root and translocated to the root was drastically reduced, but 42K was not. Potassium uptake from the rhizosphere is mediated mainly by KUP/HAK/KT and CNGC transporters. In poplar, however, these genes were constantly expressed under short-day conditions except for a slight increase in the expression a KUP/HAK/KT gene six weeks after the onset of the short-day treatment. These results indicated that the suppression of 137Cs uptake was triggered by short day length but not regulated by competitive Cs+ and K+ transport. We hypothesize that there are separately regulated Cs+ and K+ transport systems in poplar.

Agricultural Implications of the Fukushima Nuclear Accident (III)

“…Regarding calcium (Ca) translocation, indicated the Ca transport from root to shoot is also regulated by the shift from LD to SD in Populus maximowiczii. To investigate if a similar shift occurs for 137 Cs, Cs uptake through roots and its behavior within the plant body was compared in LD and SD conditions (Noda et al 2016).…”

“…Poplars in each condition were treated with 137 Cs for 48 h. Error bars represent standard deviation (n = 3). [Modified fromNoda et al (2016)]…”

Application of the Artificial Annual Environmental Cycle and Dormancy-Induced Suppression of Cesium Uptake in Poplar

“…Regarding calcium (Ca) translocation, Furukawa et al (2012) indicated the Ca transport from root to shoot is also regulated by the shift from LD to SD in Populus maximowiczii. To investigate if a similar shift occurs for 137 Cs, Cs uptake through roots and its behavior within the plant body was compared in LD and SD conditions (Noda et al 2016).…”

“…Error bars represent standard deviation (n = 3). (Modified from Noda et al (2016)) Comparing the data presented in Figs. 10.2 and 10.4, 137 Cs accumulation decreased under SD6 condition but 42 K accumulation remained constant through the SD transition.…”

“…Poplars in each condition were treated with137 Cs for 48 h. Error bars represent standard deviation (n = 3). [Modified fromNoda et al (2016)]…”