Independent recruitment of a conserved developmental mechanism during leaf evolution

被引:163
作者
Harrison, CJ [1 ]
Corley, SB [1 ]
Moylan, EC [1 ]
Alexander, DL [1 ]
Scotland, RW [1 ]
Langdale, JA [1 ]
机构
[1] Univ Oxford, Dept Plant Sci, Oxford OX1 3RB, England
基金
英国生物技术与生命科学研究理事会;
关键词
D O I
10.1038/nature03410
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Vascular plants evolved in the Middle to Late Silurian period, about 420 million years ago(1). 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(2-4). In extant plants, these events are represented by microphyllous leaves in lycophytes (clubmosses, spikemosses and quillworts) and megaphyllous leaves in euphyllophytes ( ferns, gymnosperms and angiosperms). Our current understanding of how leaves develop is restricted to processes that operate during megaphyll formation. Because microphylls and megaphylls evolved independently, different mechanisms might be required for leaf formation. Here we show that this is not so. Gene expression data from a microphyllous lycophyte, phylogenetic analyses, and a cross-species complementation experiment all show that a common developmental mechanism can underpin both microphyll and megaphyll formation. We propose that this mechanism might have operated originally in the context of primitive plant apices to facilitate bifurcation. Recruitment of this pathway to formleaves occurred independently and in parallel in different plant lineages.
引用
收藏
页码:509 / 514
页数:6
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