Accumulation of radioactive phosphorus-32 or sulphur-35 in the lesions produced by various treatments on the leaves of some Nicotiana plants

Abstract

Accumulation of radioactive phosphorus-32 or sulphur-35 in the lesions produced by various treatments of the leaves of some Nicotiana plants water-cultured with the isotopes was tested.
Zonate accumulation of phosphorus-32 was found at the tobacco leaf spots produced by 2per cent CuSO₄ and by saturated KClO₃ solutions; especially at the lesions produced by the latter the accumulation of phosphorus-32 was more conspicuous than by the former. No accumulation of the isotopes was found in the case of 0.5per cent HCl.
Accumulation of phosphorus-32 or sulphur-35 was not observed at the punched portions by cork borer of tobacco leaves even after 6 days from treatment at room temperature.
Accumulation of phosphorus-32 or sulphur-35 was found at the necrotic spots of N. glutinosa inoculated with TMV 48 hours before sampling.