Uptake and translocation of manganese in seedlings of two varieties of Douglas fir (Pseudotsuga menziesii var. viridis and glauca)
Article first published online: 1 MAR 2006
Volume 170, Issue 1, pages 11–20, March 2006
How to Cite
Duc̆ić, T., Leinemann, L., Finkeldey, R. and Polle, A. (2006), Uptake and translocation of manganese in seedlings of two varieties of Douglas fir (Pseudotsuga menziesii var. viridis and glauca). New Phytologist, 170: 11–20. doi: 10.1111/j.1469-8137.2006.01666.x
- Issue published online: 1 MAR 2006
- Article first published online: 1 MAR 2006
- Received: 27 June 2005 Accepted: 2 November 2005
- heavy metals;
- manganese (Mn);
- Pseudotsuga menziesii (Douglas fir)
- • Douglas fir (Pseudotsuga menziesii) variety glauca (DFG) but not the variety viridis (DFV) showed symptoms of manganese (Mn) toxicity in some field sites. We hypothesized that these two varieties differed in Mn metabolism.
- • To test this hypothesis, biomass partitioning, Mn concentrations, subcellular localization and 54Mn-transport were investigated.
- • Total Mn uptake was three-times higher in DFG than in DFV. DFV retained > 90% of 54Mn in roots, whereas > 60% was transported to the shoot in DFG. The epidermis was probably the most efficient Mn barrier since DFV contained lower Mn concentrations in cortical cells and vacuoles of roots than DFG. In both varieties, xylem loading was restricted and phloem transport was low. However, sieve cells still contained high Mn concentrations.
- • DFV displayed higher biomass production and higher shoot : root ratios than DFG. Our results clearly show that both varieties of Douglas fir differ significantly in Mn-uptake and allocation patterns rendering DFG more vulnerable to Mn toxicity.