|Author: ||C.P. Lloyd-Jones|
Carbon-14 labelled chlormequat and SADH were applied in aqueous solutions to detached leaves of apple 'Cox's Orange Pippin' and 'Bramley's Seedling', pear 'Conference', black currant 'Baldwin' and strawberry 'Cambridge Vigour'. After treatment, leaves were maintained at controlled humidity and temperature.
Absorption of the retardants by the leaves was greater at 100% r. h. than at 60% r. h., and greater at 25°C than 15°C. When Carbowax 4000 was included in the applied solutions, the absorption of both chlormequat and SADH was reduced in apple, pear and black currant, and the reduction at 100% r. h. was greater than at 60% r. h.
Carbowax increased absorption of chlormequat and SADH by strawberry leaves at 60% r. h., but depressed absorption at 100% r. h.
Absorption of SADH in 'Cox' leaves was proportional to the amount applied.
It is suggested that absorption is a diffusion process.
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