Figure 6.

Distribution of GalLDH activity and ascorbate in tissues of alfalfa (indeterminate) and bean (determinate) nodules. Both parameters were measured in zones I + II (meristem + invasion), III (infected), and IV (senescent) of alfalfa nodules, and in the peripheral tissues (P) and infected zone (I) of bean nodules. Whole nodules (N) were extracted in parallel as controls for recovery of GalLDH activity and ascorbate. Values are means ± se of three to five different extracts from nodules of at least two series of plants grown independently. Units of GalLDH activity and ascorbate content are per gram of fresh weight.