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Diversity of Pteridophytes

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Diversity of Pteridophytes BIO102: Plant Diversity OLABISI ONABANJO UNIVERSITY Bup Oyesiku PhD DIVERSITY OF PTERIDOPHYTES A D B C A A G Fertilization E F www.bupoyesiku.net ~ 1 ~ Department of Plant Science BIO102: Plant Diversity OLABISI ONABANJO UNIVERSITY Bup Oyesiku PhD Contents Topic: Diversity of Pteridophytes ....................................................................................................... 3 Objectives ......................................................................................................................................... 3 Reading Assignment .......................................................................................................................... 3 Lecture .............................................................................................................................................. 3 Introduction ...................................................................................................................................... 4 Main Content .................................................................................................................................... 4 Background of Pteridophytes ......................................................................................................... 4 Reproduction in Pteridophytes ...................................................................................................... 4 Vegetative reproduction ............................................................................................................ 4 Asexual reproduction ................................................................................................................. 5 Sexual reproduction ................................................................................................................... 5 Classification of Pteridophytes ....................................................................................................... 6 Characteristics of Pteridophytes .................................................................................................... 7 Diversity of Forms in Pteridophytes ............................................................................................... 7 Habitats of Pteridophytes .............................................................................................................. 9 Ecology of Pteridophytes ................................................................................................................... 9 Economic uses of Pteridophytes ........................................................................................................ 9 Conclusion ....................................................................................................................................... 10 Summary ......................................................................................................................................... 10 References/Further readings/Links .................................................................................................. 10 Test Yourself Questions (TYQ).......................................................................................................... 11 www.bupoyesiku.net ~ 2 ~ Department of Plant Science BIO102: Plant Diversity OLABISI ONABANJO UNIVERSITY Bup Oyesiku PhD Topic: Diversity of Pteridophytes Objectives In this lecture we will learn the followings: Clear idea of the features that separate Pteridophytes from other plants Skills in identifying them in our environment Importance of the Pteridophytes Contributions to our lives Reading Assignment In addition to the discussion in this lecture you should read current textbooks in the library and visit: ilearn.bupoyesiku.net for the online lecture. Lecture In previous lecture we discussed about non-vascular green plant bryophytes. In our earlier lectures, you have learnt about the characteristics of the members of algae, lichen, fungi and monera. In our today’s lecture, we are going to be discussing the most advanced member of the spore plants, the Pteridophytes. You will be taken to the next level of understanding biodiversity with particular reference to vascular spore plants. Pteridophyte is the first land vascular photosynthetic plants. They differ from angiosperm because their leaves have apical meristem that continues to grow in length for some time. And from other spore producing plant by bearing spores on the lower surface. They are important not only for academic teaching, but also for their unique ferns and allies for aesthetic beautification of our environment. Furthermore, your knowledge of the field (Pteridology) will makes you more conscious of their abundance and important roles to humans. Especially for those of you that are going to become famous Pteridologists, as well as those that require the knowledge in their field of study. www.bupoyesiku.net ~ 3 ~ Department of Plant Science BIO102: Plant Diversity OLABISI ONABANJO UNIVERSITY Bup Oyesiku PhD Introduction Pteridology is the study of Pteridophytes. Like bryophytes and other non-vascular plants they primarily trap solar energy directly from the atmosphere and convert it to food. They form an advance producer in terrestrial food web of a typical ecosystem. Main Content Background of Pteridophytes Pteridophytes are the first vascular plant with xylem and phloem. They reproduce by spores. Thus they are called vascular cryptogams. It is important to know that the seed plants are probably descendants of certain extinct members of pteridophytes, Progymnosperms. It is therefore obvious that some members are polyphyletic, from more than one ancestor. In addition, pteridophytes, probably evolved from the advanced green algae at about the same time as the first vascular seed plants because they both share multicellular sex organs, but the green algae lack vascular tissue. Reproduction in Pteridophytes Vegetative reproduction There are two describable types of vegetative reproduction in pteridophytes. Death of older portion of rhizome with separation of growing apices. Formation of buds on leaves, although very rare. www.bupoyesiku.net ~ 4 ~ Department of Plant Science BIO102: Plant Diversity OLABISI ONABANJO UNIVERSITY Bup Oyesiku PhD Asexual reproduction Figure1.1 Fertile Fern frond. Rachis (A), Pinnule (B), Sporangia (C) Asexual reproduction occurs in the sporangia of the sporophytes. Spores are gathered together into a group called sori, borne under the leaves surface. The sporangium form spore mother cells that meiotically form spores. When mature spores are dispersed and germinate under favorable conditions they produce a fertile and sterile fronds. Sexual reproduction The undersurface of the green heart-shaped gametophyte bears the rhizoids, antheridia and archegonia (Fig 1.2). Fertilization depends upon a water film. The resulting embryo sporophytes compose of rhizines (roots), fronds (leaves). www.bupoyesiku.net ~ 5 ~ Department of Plant Science BIO102: Plant Diversity OLABISI ONABANJO UNIVERSITY Bup Oyesiku PhD A D B C A A G Fertilization E F Figure 1.2 Simplified sexual life cycle in Pteridophyte. Heart-shaped gametophyte (A), Female gametangium (B), Male gametangium (C), Rhizoid (D), Young sporophyte (E), Rhizine (F), Spores (G). Classification of Pteridophytes Under the current trend in classification, living members of pteridophytes consist of four major divisions, Psilotophyta (whisk ferns) Lycopodiophyta Sphenophyta and Pterophyta. It will interest you to know that Lycopodium spp. (Club moss) share resemblance with mosses and was in the past mistakenly classified under the Bryophyta. www.bupoyesiku.net ~ 6 ~ Department of Plant Science BIO102: Plant Diversity OLABISI ONABANJO UNIVERSITY Bup Oyesiku PhD Characteristics of Pteridophytes Most fronds (leaves) are compound, although some are simple Fertile leaves with spore on the undersurface and sterile leaves Sporophyte is the dominant plant (independent of gametophyte) Gametophyte (prothallus) is free living small green heart-shaped plant Leaves, large and pinnate (fronds) Circinate vernation or fiddlehead (coiling leaves of young fern) Stem or rhizome in horizontal underground near soil surface Spores are house in sacs called sporangium under the leaves Spore germinate to give filamentous and later green heart-shaped prothallus Two types of spores (microspores and megaspores) Diversity of Forms in Pteridophytes Pteridophytes have two alternating plant bodies the gametophyte and sporophyte. Gametophyte for the first time in spore producing plants is dependent on the sporophytes for nutrient supply. The form of the gametophyte is heart-shaped and that of sporophyte is pinnate compound leaves (fronds). At this point it is important you to acquire the necessary skill to distinguish between the gametophyte of a thallus liverwort and that of a pteridophyte. Club mosses (Lycopodium cernuum): Go online to view the images of club mosses Spike mosses (Selaginella serpens): Go online to view the images of spike mosses www.bupoyesiku.net ~ 7 ~ Department of Plant Science BIO102: Plant Diversity OLABISI ONABANJO UNIVERSITY Bup Oyesiku PhD A B C Figure 1.3 Portion of the shoot of Selaginella serpens collected from the OOU BIOME, Ago-Iwoye, Nigeria. Lower large leaf (A), Upper small leaf (B), Rhizine (C) Quillwort (marsh plant with rosette of tubular leaves, spores at the base): Go online to view the images of Quillwort Marattioid fern: Go online to view the images of Marattioid fern Horsetails (Equisetum spp.): Go online
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