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You are viewing a single post made by chelle in the thread called Seed Arrival -- Let's chat about it #6.
Jan 22, 2015 7:17 PM CST
Name: Michele Roth
N.E. Indiana
RickCorey wrote:

I read somewhere, I think in one of Dr Deno's books, a rationale for why GA-3 is helpful to alpine seeds. They needed a mechanism that would let seeds blow around on rocky surfaces until they wound up somewhere a seedling might find a bit of soil.

On those slopes, soil comes from lichens breaking down rock into flakes, grit and sand. For example, a dip or crack in the rock where grit and soil and lichens can wash in and collect.

His idea was that plants evolved seeds that could detect GA-3, (which is mostly only produced by lichens). The seeds "knew" their chances were better where lichens were, than on a bare rocky slope. I would call that "co-evolution".

Fascinating info, Rick! Hurray!

I tip my hat to you. Thank you!

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