Figure 1.

13C NMR spectra of trehalose (A), Glc from glycogen (B), and NAG from chitin (C). The carbohydrates were obtained by sequential extraction and hydrolysis from ERM that was harvested 2 months after providing ¹³C₁ Glc to the mycorrhizal roots. Spectroscopic conditions (see “Materials and Methods”) were such that the different intensities of the signals from different carbons accurately reflect the different labeling levels in those positions of the carbohydrates. The C1 and C6 signals are indicated for each compound. Greek symbols refer to the two anomeric forms in which Glc and NAG exist in solution.