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Uptake distribution and persistence of carbon 14 labeled n di methyl amino succinamic acid in fruiting apple trees


, : Uptake distribution and persistence of carbon 14 labeled n di methyl amino succinamic acid in fruiting apple trees. Journal of Horticultural Science 55(2): 199-205

The leaves of 3 yr old apple trees, cv. Cox's Orange Pippin, were painted with 14C-labeled daminozide [N-dimethylaminosuccinamic acid, a plant growth retardant] in June. At intervals from 24 h after treatment until Dec. whole trees were sampled to measure the recovery of total radioactivity and its distribution between the various tissues. The proportion of radioactivity present as unchanged daminozide was also determined. There was no consistent change with time in the total amount of radioactivity found in each tree and the overall mean recovery was 23%. Daminozide moved rapidly throughout the plant and was found in all tissues except the roots within 48 h. Over half the radioactivity that migrated from the treated leaves was eventually accumulated by the fruits. Breakdown of daminozide in the trees was slow; for 2 wk after treatment 70-80% of the radioactivity in each tissue was unchanged growth retardant. This value decreased steadily with time in all tissues except the fruit, in which a constant high percentage of daminozide was found at all times. Of the 80 mg daminozide applied to the leaves .apprx. 20 mg was absorbed. Almost half of this was metabolized but about 7 mg persisted in the harvested fruit, 2 mg was in the fallen leaves and a similar amount remained in the tree framework. The significance of these results is discussed in relation to previous reports of the movement and metabolism of daminozide.

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