Article
Independent recruitment of a conserved developmental mechanism during leaf evolution.
Nature - 24 Mar 2005
Harrison C Jill, Corley Susie B, Moylan Elizabeth C, Alexander Debbie L, Scotland Robert W, Langdale Jane A
Abstract excerpt
Vascular plants evolved in the Middle to Late Silurian period, about 420 million years ago. The fossil record indicates that these primitive plants had branched stems with sporangia but no leaves. Leaf-like lateral outgrowths subsequently evolved on at least two independent occasions. In extant plants, these events are represented by microphyllous leaves in lycophytes (clubmosses, spikemosses and quillworts) and...
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