Figure 2.

Variation in amino acids released by roots of diverse alfalfa germplasms. Compounds in axenic root solutions from plants of nine alfalfa germplasm pools (see “Materials and Methods”) were analyzed after 48 h. “Box-and-whisker” plots show four quartiles surrounding each median value. The agronomic cultivar Moapa 69 (black arrow) produced slightly higher levels of many, but not all, amino acids than less selected populations.