| Popis: |
The IAA-oxidase and peroxidase capabilities along the length of the main stem tissues of two flax genotrophs L and S and two flax genotypes R and M were examined in vitro . Stem gradients for peroxidase activity increased basipetally in all plant types, as did IAA-oxidase activity gradients at non-rate-limiting concentrations of Mn 2+ . Correlations between peroxidase activity and non-rate-limited IAA-oxidase activity supported the contention of dual activities on the same molecule. At rate-limiting concentrations of Mn 2+ , IAA-oxidase activity did not correlate with peroxidase activity. Plant type differences were detected in rate-limited IAA-oxidase activity. This activity was higher in the stem region immediately above the cotyledons (axillary buds) of the more branched types, L and R, than in the sparsely branched types, S and M. |
