FIG. 3.

Parts of fatty acid chromatograms (fatty acid methyl esters) from the experiment with multiple plant hosts shows the total amount of each fatty acid (lower chromatograms) and the ¹³C enrichment as the ¹³C/¹²C ratio (upper chromatograms; the baseline represents natural abundance ¹³C/¹²C ratio). (A) Neutral lipid fatty acids from Allium porrum roots colonized by Glomus intraradices; (B) phospholipid fatty acids in a soil sample from a pot culture with Allium colonized by G. intraradices. The identities of the fatty acids are indicated. Fatty acid methyl ester 19:0 was added as an internal standard. Relative retention times compared to 19:0 were 0.699 (i15:0), 0.706 (a15:0), 0.788 (16:1ω5), 0.794 (16:0), 0.913 (18:2ω6,9), and 0.995 (cy19:0).