The life cycles of the different classes and families of the pteridophyta are quite unique. Haeckel 1866 called these groups of plants as pteridophytes because of their pinnate or feather like fronds leaves. Unlike the bryophytes, these plants are in the mainstream of land plant evolution and eventually gave rise to the seed plants. Pteridophyta general characteristics, classification and stelar system pteridophyta are the most primitive vascular plants. In 1880, the cryptogams of the plant kingdom were divided. All books are in clear copy here, and all files are secure so dont worry about it. The first page of the pdf of this article appears above.
Textbook of paleobotany a textbook of bryophytes pteridophytes gymnosperms and paleobotany a textbook in bryophtes, pteridophytes, gymnosperms and paleobotany mathematical literacy grade 12 textbook pdf download textbook a textbook of practical botany ii share a textbook of practical botany ii dsm v textbook textbook unc atc textbook pdf. The pteridophytes occupy the intermediate position in between the bryophytes on one hand and the phanerogams on the other. Evolution of stele in pteridophytes ppt easy biology class. Sumita, assistant professor, department of botany, pggc11, chandigarh. Each of these can be divided into life forms according to a series of morphological and other characters. Biology and evolution of ferns and lycophytes ncbi. On the basis of their anatomy jeffrey in 1902 divided the vascular plants into two types or stocks. Pteridophytes or pteridophyta, in the broad interpretation of the term or sensu. Different types of steles in pteridophytes and its evolution in higher plants. Pteridophyta have life cycle known as metagenesis with two generations, they are sporophyte and gametophyte generations. Stelar evolution in pteridophytes ppt by easybiologyclass. The primary components of stele are xylem and phloem. Every care has been taken to present the subject in a simple language and in a profusely illustrated manner for better understanding.
According to the older botanists, the vascular bundle is the fundamental unit in the vascular system of pteridophytes and higher plants. In the pteridophyte division both the sporophyte and gametophyte generations live as free living plants. Types of stele and its evolution in pteridophytes youtube. Type of stelar system in pteridophytes all part inside endodermis are called stele. Stelar theory the theory describing the structure of and the interrelationships between various types of steles in higher plants. The origin and early evolution of plants on land pdf. Reproductive biology of pteridophytes springerlink. The modern classification of pteridophytes have been suggested by many scientist according to the sporne1975 pteridophytes have been classified into six classes.
Engler 1886 suggested the term embryophyta to include bryophytes, pteridophytes, and spermatophytes. Types of stele and its evolution in pteridophytes vivek roys. In addition, in pteridophytes, the gametophyte is often very thin and can be unistratose, especially at the margins. Types of stele and its evolution in pteridophytes duration. When you think of forests and woods, you can picture trees, abundant lush green ferns, and other plants. Like reptiles first true land animals that evolved after. Nov 12, 2014 types of stele in pteridophytes and its evolution. Primitive siphonostele protostele with central pith. Pteridophytes are free sporangiate where isospores or micro and megaspores are released through the dehiscence of sporangia. Stellar structure and evolution kippenhahn, weigert. Lectures have their place in the scientific society for they often provide the stimulus for a formalization of a field of study. In pteridophytes, gametes are produced via mitosis from special cells of the gametophyte. Most pteridophytes are terrestrial and grow in moist and shady places while some flourish well in open, dry places especially in xeric conditions.
Ferns, horsetails often treated as ferns, and lycophytes clubmosses, spikemosses, and quillworts are all pteridophytes. The origin of the sporophyte in land plants represents a fundamental phase in plant evolution. Van tieghem and douliot 1886 interpreted the plant body of a vascular plant in the different way. The sporophyte was the dominant phase of the life cycle of these early pteridophytes.
Stelar theory, components of stele, different types of steles in plants, protostele. Types of stelar systems and its evolution in pteridophytes. Pteridophyte definition is any of a division pteridophyta of vascular plants such as a fern that have roots, stems, and leaves but lack flowers or seeds. Molecular evolution of pteridophytes and their relationship to seed plants. Stelar evolution of pteridophytes sporangial organization. Phytochemical studies in brazilian pteridophytes soeder 1985 reported a large inventory of papers that appeared between 1966 and 1984 on the chemical constituents of pteridophytes. Pteridophytes general characters and life cycle of ferns email. Some of the characters of pteridophytes are as follows.
Introduction and fundamental principles, basic assumptions, theorems, and polytropes, sources and sinks of energy, flow of energy through the star and construction of stellar models, theory of stellar evolution, relativistic stellar structure, structure of distorted stars, stellar pulsation and oscillation, the. Unlike the bryophytes, the sporophytethe asexual generationis well developed and divided, except in psilotophyta, into stems, leaves, and roots. Phytochemical studies in pteridophytes growing in brazil. All pteridophytes have a true alternation of generations, in which a dominant sporophyte generation produces spores through meiosis, and a free living gametophyte generation forms gametes egg and sperm by mitosis. Both these components stele and cortex are separated by the endodermis.
Stelar theory also says that the cortex and the stele are the two fundamental. This is nowhere more conspicuous than in the ferns and lycophytes, the only organisms in which both phases are capable of independent, free. Evolution and biogeography of gymnosperms request pdf. Classification of pteridophytes for a long time the division pteridophyta includedthe ferns, lycopods and horsetails. General characters characteristics, life cycle, alternation of generation and life cycle of pteridophytes ferns ppt and pdf download. These ferns, in biological terms, are nothing but the pteridophytes, belonging to the division pteridophyta of the plant kingdom.
This author lists a total of 671 references, but only one work had been carried out in brazil miraglia et al. Pteridophytes constitute a significant and important group in the plant kingdom. Life cycles of lycopodium, selaginella, equisetum, adiantum and marsilea. New results have added to our knowledge about the gametophytesporophyte junction in bryophytes, hornworts and pteridophytes and its significance for archegoniate land plant evolution. The plant body can be divided into a true root, stem, and leaves. Firstly all the botanists divided the plant kingdom into two large groups cryptogamia and phanerogamia, linnaeus 1754 used the term cryptogams for the first time for those plants which did not possess visible sex organs. Heterosporous megaspores important in species identifications and gametophyte development is endosporic. The greater part of the stele is composed of vascular tissuesxylem wood and phloem bastwhich are arranged differently in different types of steles. The vascular tissues are usually surrounded by pericycle, which. The term stele for the first time was used by van tieghem and douliot in 1886 in their stelar theory. Therefore the pericycle xylem and phloem together is called stele.
In higher vascular plants pteridophytes, gymnosperms and angiosperms, the leaf traces are large, and it appears that they play an important role in the vascular. Life forms of pteridophyta, their origin and evolution. In pteridophytes the stele is divided in to different type on the basis of arrangement of. Types of stelar system and its evolution in pteridophytes. O proposed by van tieghem and douliot in 1886 o major highlights in stellar theory are. Read the introductory remarks and list of characteristics of the bryophytes p. The different species of selaginella are grown as the garden plants. The most characteristic feature of the pteridophytes is the presence. Plant science botany evolution bar chart projects to try study type learning plants. Among green plant lineages, none are as speciesrich as vascular plants tracheophytes. Pteridophytes differ from bryophytes in that the sporophyte is branched and generally much larger and more conspicuous, and from seed plants in that both generations are independent and free living. They are psilopsida, psilotopsida, lycopsida, sphenopsida, pteropsida and progymnospermopsida.
The origin and early diversification of land plants marks an interval. Stellar evolution is the result of that method of exposition. Endodermis is the boundary between cortex and stele. Pteridophytes or ferns first appeared in the fossil record more than 350 million years ago. Pteridophytes free download as powerpoint presentation. Basic types of steles protostele central xylem, surrounding phloem. Pteridophyta general characteristics, classification and. And among the first of the plants to truly live on land were the pteridophytes.
Pteridophytes biology encyclopedia plant, body, different. Unlike bryophytes, fern sporophytes are freeliving and only briefly dependent on the maternal. They possess certain combinations of major characters which are not found in bryophytes or in phanerogams. Pteridophytes ferns and lycophytes are freesporing vascular plants that have a life cycle with alternating. This pdf version does not have an isbn or issn and is not therefore effectively published melbourne code, art. Pteridophytes differ from mosses and seed plants in that both generations are independent and free living, although the sporophyte is generally much larger and more conspicuous. Pteridophyta teridafata os made from two greek roots that mean winged pteryz.
The use of pteridophytes in these works was classified in seven different types. Ferns can be used to illustrate the life cycle stages common to all pteridophytes. An updated checklist of pteridophytes of district mansehra, khyber pukhtunkhwapakistan article pdf available in plant science today 32. The following separation of the main growth forms of pteridophyta is proposed. Pteridophyte definition of pteridophyte by merriamwebster. Pteridophytes introduction, authors and addresses, systematic list, glossary, and key to tribes. Problems of cytology and evolution in the pteridophyta. Stelar theory article about stelar theory by the free. Evolution of hawaiian ferns and fern allies in relation to. Find powerpoint presentations and slides using the power of, find free presentations research about pteridophytes ppt. The fundamentals of stellar astrophysics download book. Tippo 1942 considered tracheophyta to include pteridophytes and spermatophytes.
The sporophyte is the conspicuous and familiar plant body. Pteridophytes have a distinctive alternation of independent free living generations. Morphological diversity and evolution of vegetative organs pteridophytes download pteridophytes or read online here in pdf or epub. Because pteridophytes produce neither flowers nor seeds, they are sometimes referred to as cryptogams, meaning that their means of reproduction is hidden. Pteridophytes are polysporangiate, either homosporous or heterosporous. Stelar theory also says that the cortex and the stele are the two fundamental parts of a shoot system. The pteridophytes are an economically important group of plants. The sexuality of pteridophyte gametophytes can be classified as follows. Van tieghem and douliot 1886 interpreted the plant body of vascular plant in the different way. Pteridophytes or pteridophyta, in the broad interpretation of the term or sensu lato, are vascular plants plants with xylem and phloem that reproduce and disperse via spores. Find plant tissue systems vector illustration labeled stock images in hd and millions of other royalty free stock photos, illustrations and vectors in the shutterstock collection.
Some pteridophytes are aquatic and some are epiphytes. The book is written strictly in accordance with the revised common core syllabus adopted by the universities in andhra pradesh. The sporophyte is much larger and longer lived than the gametophyte. Complete 18s ribosomal rna sequence data from representatives of all extant pteridophyte lineages together with rna sequences from different seed plants were used to infer a molecular phylogeny of vascular plants that included all major land plant lineages. But trust me the first thing that you notice is the abundant foliage of fern plants. A pteridophyte is a vascular plant with xylem and phloem that disperses spores. Pdf difference between bryophytes and pteridophytes. A fern polypodiopsida or polypodiophyta is a member of a group of vascular plants that. The molecular data indicate that lycopsids are monophyletic and are the earliest diverging group within the vascular land plants. The fern gametophyte is an autotrophic, freegrowing entity with a definite form. Today this subject is controversial, and scarcely considered in textbooks and journals of botany, in spite of its importance.
It is speculated that life began in the oceans, and through millions of years of evolution, life slowly adapted on to dry land. The empirical basis of botanical systematics has been broadened far beyond the realm of macromorphological traits on which systematists have based their decisions for more than 200 years. As with all plants, in pteridophytes, meiosis is sporic, meaning that cells of the sporophyte undergo meiosis and generate spores that then develop into the gametophyte via mitosis. The first vascular plants rapidly diversified to cover the earth. Introduction and historical summary over the past 70 years, many fern classifications, nearly all based on morphology, most explicitly or implicitly phylogenetic, have been proposed. Pteridophyta characteristics, life cycle, classification. View and download powerpoint presentations on pteridophytes ppt.
The pteridophytes occupy an intermediate position between the bryophytes and gymnosperms. Gametophytes of homosporous ferns publications of the ias fellows. Pteridophytes article about pteridophytes by the free. The stele is a real entity and present universally in all axis of higher plants. At that time, what is now temperate europe and north america had climate conditions that favored yearround growth.
The influence of soil evolution on pteridophyte diversification. Stelar evolution of pteridophytes, sporangial organization homospory and heterospory. In general, pteridophytes have a long fossil record and. Some of the species belonging to this division have small leaves called as the microphylls. The evolution and diversification of epiphytic ferns pdf phd thesis. Publication date 1950 topics pteridophyta, karyokinesis publisher. Evolution of the conducting tissue in pteridophyta. University botanyi is a comprehensive textbook for students of 1st year b. Pdf an updated checklist of pteridophytes of district. Some of the most important types stelar system in ferns are as follows. Useful notes on the classification of pteridophytes. Stelar evolution in pteridophytes ppt types of steles and its evolution in pteridophytes ppt what is stele. Tissues like pericycle, medullary rays and pith are also the components of stele.
A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The printed version, however, was effectively published on 6 june 20. Stelar evolution in pteridophytes easybiologyclass. Problems of cytology and evolution in the pteridophyta by manton, i. Different types of protostele, siphonostele and solenostele with examples. Scribd is the worlds largest social reading and publishing site.
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