Abstract
In most species of the Genlisea–Utricularia sister lineage, the organs arising directly after germination comprise a single leaf-like structure, followed by a bladder-trap/stolon, with the lack of an embryonic primary root considered a synapomorphic character. Previous anatomical work suggests that the most common recent ancestor of Utricularia possessed an embryo comprising storage tissue and a meristematic apical region minus lateral organs. Studies of embryogenesis across the Utricularia lineage suggest that multiple primary organs have only evolved in the viviparous Utricularia nelumbifolia, Utricularia reniformis, and Utricularia humboldtii within the derived Iperua/Orchidioides clade. All three of these species are specialized for growth as “aquatic epiphytes” in the tanks of bromeliads, with recent phylogenetic evidence suggesting the possibility that multiple primary organs may have evolved twice independently within this clade. The primary organs of viviparous Utricularia also possess epidermal surface glands, and our study suggests that these may function as root hairs for uptake of solutes from the external environment—a possible adaptation for the “aquatic–epiphytic” habitat.
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Acknowledgments
This paper is dedicated to Charles Darwin to mark 200 years since his birth and 150 years since the publication of his “On the Origin of Species”. This study was funded by grant N N304 002536 from the Polish Ministry of Science and Higher Education. The first author gratefully acknowledges the support of an award from the Foundation for Polish Sciences (Start Programme). We thank our colleagues Kamil Pásek (Czech Republic, http://www.bestcarnivorousplants.com) and Dr. Lubomir Adamec for kindly providing seeds and seedlings for this study. We thank the rector of the Jagiellonian University, Professor Szczepan Biliński, for generously supporting our projects, and Dr. Miroslav Studnička (Director of the Botanical Garden in Liberec, Czech Republic) for kindly providing U. reniformis “Enfant Terrible” for our study. We particularly thank reviewers for very helpful suggestions to make our manuscripts more clear.
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Płachno, B.J., Świątek, P. Unusual embryo structure in viviparous Utricularia nelumbifolia, with remarks on embryo evolution in genus Utricularia . Protoplasma 239, 69–80 (2010). https://doi.org/10.1007/s00709-009-0084-1
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DOI: https://doi.org/10.1007/s00709-009-0084-1