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Evolution of endoapertures in early-divergent eudicots, with particular reference to pollen morphology in Sabiaceae

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Abstract

Endoapertures, the inner openings of compound apertures in pollen grains, are common in eudicots, but occur infrequently in early-divergent eudicot lineages, in which they are restricted to three families: Menispermaceae, Sabiaceae and Buxaceae. Pollen of Sabiaceae was examined using light, scanning and transmission electron microscopy. The endoapertures are large and lalongate, and intine onci are associated with their development. Optimisation of endoapertures onto an existing angiosperm phylogeny indicates that endoapertures have evolved at least three times independently: in Menispermaceae, in Sabiaceae plus Buxaceae (or possibly separately in these two families), and in the core eudicot clade. Sabiaceae are unusual among early-divergent eudicots in that they possess some characters that are more common in core eudicots, including pollen with endoapertures and pentamerous flowers. This indicates either that they are more closely related to core eudicots than is indicated by current molecular evidence, or that these characters are homoplastic. The latter would suggest a high degree of experimentation prior to evolutionary canalisation of some key morphological features in eudicots. The evolution of endoapertures in early-divergent eudicots is probably associated with possession of endexine sculpture (endosculpture) such as endocracks; endoapertures may have been retained in eudicots as a harmomegathic mechanism.

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Authors and Affiliations

  1. Micromorphology Section, Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3DS, UK

    C. A. Furness & P. J. Rudall

  2. Instituto de Biología, Universidad Nacional Autónoma de México, A. P. 70-233, México D.F, 04510, Mexico

    S. Magallón

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  1. C. A. Furness
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  2. S. Magallón
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Correspondence to C. A. Furness.

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Furness, C.A., Magallón, S. & Rudall, P.J. Evolution of endoapertures in early-divergent eudicots, with particular reference to pollen morphology in Sabiaceae. Plant Syst. Evol. 263, 77–92 (2007). https://doi.org/10.1007/s00606-006-0477-y

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