Spatial Distribution of Ethylene Production by Individual Needles Along a Shoot ofPinus sylvestrisL.: Relationship with Peroxidase Activity

Spatial distribution of ethylene production by individual current year needles and the relationship with peroxidase activity was studied along a shoot of Scots pine (Pinus sylvestrisL.). Much variation in ethylene production between and within individual seedlings was found. There was a significant difference in mean intensity of ethylene production between orthostichies within individual seedlings. The capacity of individual needles to convert 1-aminocyclopropane-1-carboxylic acid (ACC) to ethylene did not correlate with the basal rate of ethylene production. Mean ethylene production intensity by orthostichies correlated positively with mean peroxidase activity. A positive correlation betw…