INCORPORATION OF LABEL INTO THE INTERCELLULAR SUBSTANCE OF STYLAR TRANSMITTING TISSUE FROM PETUNIA PISTILS LABELED WITH TRITIATED MYO-INOSITOL. AN ELECTRONMICROSCOPIC AUTORADIOGRAPHIC STUDY

Pistils of Petunia hybrida were labeled with tritiated myo-inositol. Electronmicroscopic auto-radiographs of cross sections through the stylar transmitting tissue were made 72 hours after labeling. The silver grains were found predominantly above the intercellular substance and the cell wall region. These results provide additional evidence for the assumed carbohydrate nature of the intercellular substance.