RE: 'Early wood' samples reshape plant history
August 16, 2011 at 1:04 pm
(This post was last modified: August 16, 2011 at 1:07 pm by The Grand Nudger.)
Good to see that they've found samples for this theory. Fascinating stuff really. As a plant grows taller it becomes more difficult to bring water to the top. You've got transpirational pull, and densities of salts, but that only gets you so far up. Having a firm core or outer stem to contract against makes moving water up a little easier. Without a mechanism to transport water to ever increasing heights, you would not need wood as support. I love how elegant this response was. Plants able to form a denser stem or core would have been able to grow taller, and then plants that could arrange this tissue into a more sturdy support would grow yet taller. It's a biological arms race. They're trying to kill each other.
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