High-affinity sodium uptake in land plants
Haro, R., Universidad Politecnica de Madrid (Spain) | Banuelos, M.A. | Rodriguez-Navarro, A.
High-affinity Nasup(-) uptake in plants and its mediation by HKT transporters have been studied in very few species. This study expands the knowledge of high-affinity Nasup(-) uptake in land plants for both uptake characteristics and involvement of HKT transporters. In non-flowering plants, we analyzed the Nasup(-) content of wild mosses, carried out experiments on Ksup(-) and Nasup(-) uptake in the micromolar range of concentrations with the moss Physcomitrella patens and the liverwort Riccafluitans, studied a deltahkt1 mutant of P. patens and identified the HKT genes of the lycopodiophyta (clubmoss) Selaginella moellendorffi. In flowering plants we studied Nasup(-) uptake in the micromolar range of concerntrations in 16 crop plant species, indentified the HKT transporters that could mediate high-affinity Nasup(-) uptake in several species of the Triticeae tribe, and described some characteristics of high-affinity Nasup(-) uptake in other species. Our results suggest that high-affinity Nasup(-) uptake occurs in most land plants. In very few of them, rice and species in the Triticeae and Aveneae tribes of the Poaceae family, it is probably mediated by HKT transporters. In other plants, high-affinity Nasup(-) uptake is mediated by one or several transporters whose responses to the presence of Ksup(-) or Basup(2-) are fundamentally different from those of HKT transporters.
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