photoperiodism

[Carl Pike]

In our class discussion of the photoperiodic control of flowering, after I
presented the experiments showing (by means of night interruption) that
plants are timing the length of the night, rather than the length of the
day, a student asked **why** (in an evolutionary sense) it is the night
that is timed.

Any suggestions out there?

Carl S. Pike                             (717) 291-3958
Department of Biology                    FAX (717) 399-4548
Franklin and Marshall College            Internet  C_PIKE at ACAD.FANDM.EDU
P.O. Box 3003
Lancaster, PA  17604-3003  USA