TABLE 1

Nodules per trapping plant for each plant-trapping assay

Predominant phenotypeAlder stand (indigenous species)Trapping species (avg ± SD)
A. glutinosaA. incanaA. viridis
Sp+TR (A. glutinosa)3.2 ± 0.43.0 ± 0.50
OR (A. incana)03.7 ± 1.20
ORV (A. viridis)2.1 ± 0.32.1 ± 0.33.5 ± 0.9
Sp−LB (A. glutinosa)10.9 ± 1.010.8 ± 2.40
FF (A. incana)8.3 ± 0.89.4 ± 1.86.2 ± 1.4
XF (A. viridis)5.9 ± 0.85.3 ± 0.611.3 ± 1.4
  • aSpore-positive (Sp+) and spore-negative (Sp) are the predominant types of Frankia strains observed in the field nodules from the 6 alder stand soils used for the trapping. Average values and standard deviations of the nodule numbers per plant are reported for each of the three trapping species (Alnus glutinosa, Alnus incana, and Alnus viridis).