How do seed cells know the difference between top and bottom?

Jumbuck at
Wed Apr 23 21:20:43 EST 1997

Matthew wrote:
> If you plant a germinating seed in soil, how does the seed know where
> is the top and where is the bottom?
> In other words, the "leaf part" grows upwards, and the "root part"
> downwards. What sensory device does the seed appear to have to know
> where to grow.
> Have experiments been done, turning the seed containers half-way
> through the growth process. What do they show? Where might I find
> references?
> Who knows the answer to this? Please answer per email, I shall reply
> with thanks.
> Matthew
> NewsGrp at

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