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Responses to Iron Limitation in Hordeum vulgare L. as Affected by the Atmospheric CO₂ Concentration

^a Inst. of Soil Science, Univ. of Hohenheim, 70599 Stuttgart, Germany
^b Inst. of Plant Nutrition, Univ. of Hohenheim, 70593 Stuttgart, Germany
^c Creative Research Initiative ‘Sousei’ (CRIS), Hokkaido Univ., N21W10, Kita-ku, Sapporo 001-0021, Japan
^d Inst. of Plant Cultivation and Plant Nutrition, Humboldt Univ., Berlin, Germany

View larger version (99K): [in this window] [in a new window]   Fig. 1. Hordeum vulgare grown in nutrient solution 26 days after sowing (DAS). Appearance of strong iron deficiency chlorosis particularly expressed under elevated CO2.

View larger version (47K): [in this window] [in a new window]   Fig. 2. (a-d) Shoot and root biomass and root/shoot ratio of Hordeum vulgare grown in nutrient solution and in soil culture on a calcareous Loess subsoil, depending on plant age, Fe supply, and atmospheric CO2 concentration. Bars represent means and standard errors. Different letters indicate significant differences at the P < 0.05 level between treatments for each single harvest time

View larger version (24K): [in this window] [in a new window]   Fig. 3. (a-c) Fe-nutritional status and leaf chlorophyll levels (SPAD values) of soil-grown barley plants at 28 days after sowing (DAS), depending on Fe supply and atmospheric CO2 concentration. Bars represent means and standard errors. Different letters indicate significant differences at the P < 0.05 level. The dashed line symbolizes the average Fe concentration sufficient for average plant growth (Marschner, 1995).

View larger version (20K): [in this window] [in a new window]   Fig. 4. Phytosiderophore exudation in 0.5 to 2.5 cm apical root zones of barley plants grown in nutrient solution, depending on plant age, Fe supply, and atmospheric CO2 concentration. Bars represent means and standard errors. Different letters indicate significant differences at the P < 0.05 level between treatments for each single harvest time.

View larger version (28K): [in this window] [in a new window]   Fig. 5. Phytosiderophore concentrations in lateral root tissue of barley plants grown in rhizoboxes at 28 days after sowing (DAS). Bars represent means and standard errors. Different letters indicate significant differences at the P < 0.05 level.