Table II.

Taxonomic distribution of ll-DAP-AT activity

The assay conditions were as described in Figure 2, except that some samples were measured at 22°C (*) and others at 30°C (**). Soluble protein extracts were prepared from the leaves of all the angiosperms except maize, which was prepared from embryogenic callus cultures. The other samples were from gametophytic thallus of P. patens or from growing cultures of the microorganisms. Activity is ΔA (440 nm) min⁻¹ mg protein⁻¹ × 10³.

Species	Activity
Arabidopsis**	20.1
Brassica napus*	2.1
Chlamydomonas reinhardtii*	14.5
Convallaria majalis**	1.8
Glycine max*	5.2
P. patens**	2.8
Pea**	2.4
Spinach*	4.4
Maize*	9.3
Synechococcus sp.*	12.4
Agrobacterium tumefaciens**	<0.1
Bacillus megaterium*	<0.1
B. subtilis 168**	<0.1
E. coli*	<0.1
Rhizobium tropici**	<0.1