Flower structure and development in Tupidanthus calyptratus (Araliaceae): an extreme case of polymery among asterids |
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| Authors: | D D Sokoloff A A Oskolski M V Remizowa M S Nuraliev |
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| Institution: | (1) Department of Higher Plants, Biological Faculty, Moscow State University, 119992 Moscow, Russia;(2) Botanical Museum, V.L. Komarov Botanical Institute of the Russian Academy of Sciences, 2, Prof. Popov str. 197376, St. Petersburg, Russia |
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| Abstract: | Flowers of Tupidanthus show an extreme case of floral polymery among asterids. Floral development and gynoecium structure have been examined. The
floral meristem has a complex folded shape. The tiny calyx is initiated as a continuous ring primordium. The corolla is initiated
as a lobed ring and develops into a calyptra. All stamen primordia appear simultaneously as a single whorl. The carpels, also
in a single whorl, tend to alternate with the stamens. Some Schefflera species related to Tupidanthus are also studied. The flower of Tupidanthus is interpreted as a result of fasciation. Further investigation should determine whether mutation(s) in gene(s) of the CLAVATA
family are responsible for the fasciation here. The significance of Tupidanthus for understanding spatial pattern formation in flowers of Araliaceae, and both functional and developmental constraints in
angiosperm flowers with a single polymerous carpel whorl are discussed. |
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| Keywords: | Araliaceae development evolution fasciation flower polymery Schefflera Tupidanthus |
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