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  • Physiological responses of biomass allocation, root architecture, and invertase activity to copper stress in young seedlings from two populations of Kummerowia stipulacea (maxim.) Makino.

Physiological responses of biomass allocation, root architecture, and invertase activity to copper stress in young seedlings from two populations of Kummerowia stipulacea (maxim.) Makino.

Ecotoxicology and environmental safety (2014-04-15)
Luan Zhang, Yuxue Pan, Wei Lv, Zhi-ting Xiong
RESUMEN

In the current study, we hypothesize that mine (metallicolous) populations of metallophytes form a trade-off between the roots and shoots when under copper (Cu) stress to adapt themselves to heavy metal contaminated habitats, and thus, differ from normal (non-metallicolous) populations in biomass allocation. To test the hypothesis, two populations of the metallophyte Kummerowia stipulacea, one from an ancient Cu mine (MP) and the other from a non-contaminated site (NMP), were treated with Cu(2+) in hydroponic conditions. The results showed that MP plants had higher root/shoot biomass allocation and more complicated root system architecture compared to those of the NMP plants when under Cu stress. The net photosynthetic capacity was more inhibited in the NMP plants than in the MP plants when under Cu stress. The sugar (sucrose and hexose) contents and acid invertase activities of MP plants were elevated while those in NMP plants were inhibited after Cu treatment. The neutral/alkaline invertase activities and sucrose synthase level showed no significant differences between the two populations when under Cu stress. The results showed that acid invertase played an important role in biomass allocation and that the physiological responses were beneficial for the high root/shoot biomass allocation, which were advantageous during adaptive evolution to Cu-enriched mine soils.

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Copper, mesh coil, 1m, nominal aperture 0.14mm, thickness 0.25mm, wire diameter 0.115mm, 100x100 wires/inch, open area 30.3%, plain weave mesh
Copper, mesh, 100x100mm, nominal aperture 0.14mm, thickness 0.25mm, wire diameter 0.115mm, 100x100 wires/inch, open area 30.3%, plain weave mesh
Copper, rod, 200mm, diameter 4.8mm, as drawn, 99.99+%
Copper, rod, 500mm, diameter 4.8mm, as drawn, 99.99+%
Copper, rod, 500mm, diameter 6.35mm, as drawn, 99.999%
Copper, sphere, 100pcs, diameter 1.0mm, precision sphere grade 200
Copper, tube, 1000mm, outside diameter 3.0mm, inside diameter 1.2mm, wall thickness 0.9mm, as drawn, 99.9%
Copper, sphere, 200pcs, diameter 1.0mm, precision sphere grade 200
Copper - O.F.H.C., foil, 150x150mm, thickness 1.0mm, half hard, 99.95+%
Copper - O.F.H.C., foil, 25x25mm, thickness 0.1mm, hard, 99.95+%
Copper - O.F.H.C., foil, 25x25mm, thickness 0.20mm, hard, 99.95+%
Copper - O.F.H.C., wire reel, 10m, diameter 1.5mm, hard, 99.95+%
Copper - O.F.H.C., tube, 500mm, outside diameter 1.78mm, inside diameter 0.8mm, wall thickness 0.49mm, 99.95+%
Copper - O.F.H.C., wire reel, 50m, diameter 0.80mm, as drawn, 99.95+%
Copper - O.F.H.C., foil, 300x300mm, thickness 0.1mm, annealed, 99.95+%
Copper - O.F.H.C., tube, 500mm, outside diameter 1.23mm, inside diameter 0.51mm, wall thickness 0.36mm, 99.95+%
Copper - O.F.H.C., foil, 300x500mm, thickness 2.0mm, half hard, 99.95+%
Copper - O.F.H.C., foil, 50x50mm, thickness 0.7mm, half hard, 99.95+%
Copper - O.F.H.C., foil, 50x50mm, thickness 1.0mm, half hard, 99.95+%
Copper, tube, 1000mm, outside diameter 2.5mm, inside diameter 1.9mm, wall thickness 0.3mm, as drawn, 99.9%
Copper, microfoil, disks, 25mm, thinness 0.5μm, specific density 448μg/cm2, permanent mylar 3.5μm support, 99.99+%
Copper - O.F.H.C., wire reel, 5m, diameter 0.75mm, as drawn, 99.95+%
Copper - O.F.H.C., foil, 150x150mm, thickness 0.5mm, half hard, 99.95+%
Copper - O.F.H.C., foil, 25x25mm, thickness 0.1mm, annealed, 99.95+%
Copper, insulated wire, 5m, conductor diameter 0.4mm, insulation thickness 0.025mm, polyimide insulation, 99.99%
Copper, insulated wire, 10m, conductor diameter 0.025mm, insulation thickness 0.005mm, polyurethane insulation, 99.99%
Copper, insulated wire, 10m, conductor diameter 0.7mm, insulation thickness 0.01mm, polyurethane insulation
Copper, insulated wire, 5m, conductor diameter 0.05mm, insulation thickness 0.002mm, 2 micron polyesterimide insulation, 99.9%
Copper - O.F.H.C., foil, 50x50mm, thickness 0.15mm, half hard, 99.95+%
Copper - O.F.H.C., foil, 50x50mm, thickness 0.1mm, annealed, 99.95+%