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algae, plants and potassium

Something occured to me while pondering my plants this morning.  That
happens sometimes :)

I've heard or read that potassium is used by algae and plants for turgor,
phototropism and transport.  Are there other important roles?  It seems to
me that these functions (with the exception of turgor) might be much more
important to higher plants than they are to algae.  I've never heard of
algae "following the sun" and they would seem to have much smaller
transport requirements than higher plants.

Does a shortage of potassium favor the growth of algae over higher plants?

Roger Miller