communication between plants

wjboelem at wjboelem at
Mon Jul 10 10:08:14 EST 2000

I have a question regarding Walter Larcher's book, Physiological Plant
Ecology. In it (page 41) he says" Reflection of red light plays an
important role in communication between neighboring plants. Because the
red/far-red ratio in the reflected light increases with increasing
distanace from the plant reflecting it, the receiving plant, via its
phytochrome system (Phyr/Phyfr; far-red equilibrium), is able to detect
the presence and distance of its neighbors". How is this accomplished?
Why does red/far-red ratio increase with distance from the plant
reflecting it?

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