Dissimilar pollen tetrad development inEricaceae andOnagraceae causes family-specific viscin thread configuration
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Abstract
Genetically fixed polarities in pollen tetrad development lead to different, but family-specific arrangements of particular ektexine elements in the two unrelated angiosperm familiesEricaceae andOnagraceae. In the former, the so-called viscin threads are inserted on the distal, in the latter on the proximal pollen face only. Despite their diametrically opposed configurations, the viscin threads of the two families have attained identical functions in pollination ecology by convergent evolution.
Key words
Ericaceae Onagraceae Microsporogenesis exine pollination ecology viscin threadsPreview
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References
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- Waha, M., 1982: Zur Ultrastruktur und Funktion pollenverbindender Fäden bei Angiospermen, insbesondere der Viscinfäden beiEricaceae. — Diss. Univ. Wien 1982.Google Scholar
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© Springer-Verlag 1983