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Bryophyte Isozymes: Systematic and Evolutionary Implications

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Book cover Isozymes in Plant Biology

Abstract

Traditionally, bryophytes have been treated as a single division comprising three classes: Musci (mosses), Hepaticae (liverworts), and Anthocerotae (hornworts). The relative sizes of these groups are estimated as 700 genera and 10.000 species of mosses; 330 genera and 8,000 species of liverworts; and four genera and 360 species of hornworts (Schofield, 1985). Estimates of the total number of bryophyte species vary from 16,000 to 22,000 (Bold et al., 1986). Much of the unity of bryophytes as a group derives from their uniform possession of an alternation of generations unique among land plants. The sexual cycle involves a dominant, free-living, haploid gametophyte alternating with a reduced, dependent, diploid sporophyte (Fig. 11.1). Despite the elaborate specialization of its tissues in some groups, the sporophyte remains attached to, and nutritionally dependent on, the gametophyte throughout its lifetime. Bryophytes have successfully exploited a diversity of habitats in which their direct competition with seed plants is minimized (Anderson, 1980). According to Anderson (1980), this may explain why the number of bryophyte species is nearly twice that of pteridophytes. Morphologically and anatomically, bryophytes are considered structurally simple compared to vascular plants, but they have proven to be unexpectedly rich in chemical variation (Giannasi, 1978).

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  1. Ireneusz J. Odrzykoski

    Present address: Department of Genetics, Institute of Biology, Adam Mickiewicz University, Dabrowskiego St. 165, 60-594, Poznan, Poland

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  1. Department of Botany, University of Georgia, 30602, Athens, GA, USA

    Robert Wyatt, Ann Stoneburner & Ireneusz J. Odrzykoski

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    Douglas E. Soltis  & Pamela S. Soltis  & 

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Wyatt, R., Stoneburner, A., Odrzykoski, I.J. (1989). Bryophyte Isozymes: Systematic and Evolutionary Implications. In: Soltis, D.E., Soltis, P.S., Dudley, T.R. (eds) Isozymes in Plant Biology. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1840-5_12

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