Accumulation of radioactive phosphorus-32 in the lesions of some diseased plants

Abstract

Diseased leaves of several leaf spot diseased were inserted in the phosphorus-32 solution and the accumulation of the latter at the lesion was studied.
Phosphorus-32 was accumulated at the following spots: Tobacco anthracnose (Collelotricum tabacum), Rice leaf spot (Ophiobolus rniyabeanus), Beet leaf spot (Cercospora beticola) and the artificial leaf spot of tobacco made by CuSO₁ or KC1O₃ injections.
No accumulation of the isotope was observed at the lesions of the following spots: Sweet potato leaf spot (Phyllosticta batatas), Rice bacterial blight (Xanthomonas oryzae), and Rice stem-rot (llelminthosporium sigmoideum).