After a Dozen Years of Progress the Origin of Angiosperms is Still a Great Mystery  

Oleh:

Frohlich, Michael W. ; Chase, Mark W.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: NATURE (keterangan: ada di Proquest) vol. 450 no. 7173 (Dec. 2007), page 1184.

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Perpustakaan FK Nomor Panggil: N01.K.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Here we discuss recent advances surrounding the origin of the origin of angiosperms. Putatively primitive characters are now much better understood because of vastly improved understanding of angiosperm phylogenetics, and recent discoveries of foddil flowers have provided an increasingly detailed picture of early diversity in the angiosperms. The 'anthophyte theory', the dominant concept of the 1980s and 1990s, has been eclipsed; Gnetales, previously throught to be closest to the angiosperms, are related instead to other extant gymnosperms, probably most closely to conifers. Finally, new theories of flower origins have been proposed based on gene function, duplication and loss, as well as on morphology. Further studies of genetic mechanisms tat control reproductive development in seed plants provide a most promising avenue for futher research including tests of these recent theories. Identification of fossils with morphologies that convincingly place them close to angiosperms coul still revolutionize understanding of angiosperm origins.

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