Abstract
To study the relationship between growth, lignification, and peroxidase (POD) activity, we grew tobacco (Nicotiana tabacum var. Xanthi) control and transgenic plants, repressed in the anionic apoplastic POD by antisense transformation, under ambient and elevated CO2. It was expected that, if POD in antisense tobacco was at the threshold for normal lignification, POD activity would limit lignin production when growth was stimulated, thereby leading to diminished lignin concentrations under elevated CO2. If the maintenance of normal POD activities was associated with metabolic costs that can be reallocated to growth in plants with suppressed POD activities, elevated CO2 was expected to stimulate growth significantly more in antisense‐POD tobacco than in controls. Transgenic tobacco displayed 15% taller stems at bud set than controls, but this had no effect on whole‐plant biomass. There was no extra effect of elevated CO2 on biomass production in antisense‐POD plants as compared with untransformed plants. Th...
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