In message , Michael
Bell writes
Ah, but I can be pretty sure nobody else is thinking of breeding
Alders.

It looks as if you were overconfident. See

Hendrickson et al, Effects of Frankia on field performance of Alnus
clones and seedlings, Plant and Soil 150(2): 295-302 (1993)
(http://www.springerlink.com/content/m5431615516727n8/),

though it is 15 years old (and behind a paywall).
--
Stewart Robert Hinsley