Absorption of Radioactive Phosphorus by Mycorrhizal Roots of Pine

Abstract

Washed pieces of seedling roots of loblolly pine (Pinus taeda) and red pine (P. resinosa) 10-15 cm. in length placed in soln. containing P32 with activity of 100-500 j[mu]''c./l. for 3-4 hrs. were studied by radioautographs of whole root pieces, and Geiger counter detn. of the activity of each 1-cm. length of root. Results showed that the mycorrhizel portion of root accumulates much more P32 than non-mycorrhizal portions, even if the former are suberized and the latter non-suberized.