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. Oxidase activity in the developing xylem of branches of Sitka spruce [Picea sitchensis] (Bong) Carr. was expressed in synchrony with the deposition of lignin. The activity was closely associated with the cell wall but it could be extracted by elution with salt solutions such as 1 M NaCl or CaCl2. A number of different oxidase isoforms with isoelectric points in the range 8–5 were present in these...
. Gravitropic plant growth is due to gravistimulated asymmetric extension rates of the affected flanks of the graviresponding organ. Differential growth of the upper and lower flanks (UFs, LFs) of graviresponding plant organs may in principle be achieved by various biochemical and/or biophysical asymmetries. The gravistimulated mechanism(s) by which the different growth rates are determined is still...
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