TABLE 3.

Symbiotic characteristics of reporter GLF derivative strains^a

Strain	Fix pheno- type	Plants		Bacteroids
		Color	Dry wt (g/pot)b	Nitro- genase activityc	β-Galacto- sidase activity (Miller units)
GLF1	Fix+	Green (wild type)	4.85 ± 0.3	5.1 ± 1.6	1,021 ± 30
GLF2	Fix+	Intermediate	2.65 ± 0.25	1.9 ± 0.6	267 ± 65
GLF3	Fix+	Intermediate	2.25 ± 0.25	1.8 ± 0.45	172 ± 80
GLF4	Fix−	Yellow	1.15 ± 0.25	<10	NDd
GLF8	Fix−	Yellow	1.20 ± 0.32	<10	ND
GLF12	Fix+	Intermediate	2.67 ± 0.35	1.9 ± 0.7	40 ± 20
GLF18	Fix−	Yellow	1.12 ± 0.2	<10	ND

^aThe strains were used as inoculants for peas, and the Fix phenotypes, plant colors, dry weights 32 days after inoculation, and nitrogenase and β-galactosidase activities of pea bacteroids were determined. All values are averages ± standard deviations for three assays.

^bEach pot contained five plants.

^cNitrogenase activity is expressed in nanomoles of C₂H₂ reduced per hour per plant.

^dND, not determined.