Abstract
Uptake kinetics of arsenate were determined in arsenate tolerant and non-tolerant clones of the grass Deschampsia cespitosa under differing root phosphorus status to investigate the mechanism controlling the suppression of arsenate influx observed in tolerant clones. Influx was always lower in tolerants compared to non-tolerants. Short term influx of arsenate by the high affinity uptake system in both tolerant clones was relatively insensitive to root phosphorus status. This was in contrast to the literature where the regulation of the phosphate (arsenate) uptake system is normally much more responsive to plant phosphorus status. The low affinity uptake system in both tolerant and non-tolerant clones, unlike the high affinity uptake system, was more closely regulated by root phosphate status and was repressed to a much greater degree under increasing root phosphorus levels than the high affinity system.
Original language | English |
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Pages (from-to) | 99-106 |
Number of pages | 8 |
Journal | Plant and Soil |
Volume | 162 |
Issue number | 1 |
DOIs | |
Publication status | Published - May 1994 |
Keywords
- arsenate tolerance
- deschampsia cespitosa
- phosphorus nutrition
- uptake kinetics
- Holcus-Lanatus L
- phosphate-uptake system
- deficiency
- barley
- recovery
- stress