This document discusses the morphology, anatomy, and reproduction of Marchantia, a genus of liverwort. It belongs to the division Bryophyta, class Hepaticopsida. Marchantia has a dorsiventral gametophyte generation that reproduces sexually or asexually. Sexual reproduction involves antheridiophores bearing antheridia that produce sperm, and archegoniophores bearing archegonia containing eggs. Fertilization forms a sporophyte generation consisting of a foot, seta, and capsule containing spores. The spores germinate to form a new gametophyte generation.
Pteridophytes are vascular plants and have leaves (known as fronds), roots and sometimes true stems, and tree ferns have full trunks. Examples include ferns, horsetails and club-mosses. Fronds in the largest species of ferns can reach some six metres in length!
Many ferns from tropical rain forests are epiphytes, which means they only grow on other plant species; their water comes from the damp air or from rainfall running down branches and tree trunks. There are also some purely aquatic ferns such as water fern or water velvet (Salvinia molesta) and mosquito ferns (Azolla species).
Pteridophytes do not have seeds or flowers either, instead they also reproduce via spores.
There are around 13,000 species of Pteridophytes.
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Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
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This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
3. Habitat and Distribution
ā¢ Genus has about 65 species
ā¢ Grows best in cool, moist and shady places
ā¢ Marchantia polymorpha grows as a pioneer in burnt forest soil
Distribution in India:
ā¢ 11 species occur in India mainly in western Himalayas
ā¢ M.polymorpha occurs at high altitudes in Himalayas on moist river banks
and rocks
ā¢ M.palmate occurs in Kashmir, Kumaon, South India, Bengal and Assam
ā¢ M.simlana occurs in Himachal Pradesh
ā¢ M.nepalensis in Punjab and in Garhwal & Kumaon hills
5. Dorsal Surface:
ā¢ A shallow groove marked by the presence
of a distinct midrib in each branch
ā¢ Many polygonal areas which demarcate
the outline of underlying air chambers
ā¢ Each polygonal area has a pore in its
centre called air pore
ā¢ Gemma cups are present along the midrib
ā¢ Each branch has a growing point situated
at the apex in a groove called apical notch
7. Rhizoids
ā¢ Unicellular and colourless
ā¢ Two types
i. Smooth walled- Inner walls are
smooth
ii. Tuberculate- Inner walls show papilla
like outgrowths
ā¢ Functionā Anchorage and absorption of
water and minerals
Optical Section
8. Scales
ā¢ Multicellular(one cell in thickness) and violet
coloured due to presence of anthocyanin
pigments
ā¢ Arranged in 2 rows on either side of mid-rib
ā¢ Two types
i. Appendiculateā these have an apical sub-rotund
appendage and from inner row of
scales
ii. Ligulateā these are small, without
appendage and form outer row of scales
ā¢ FunctionāProtection of growing point and
retention of water by capillary action
Appendage
Appendiculate Scale
Ligulate scale
9. Anatomy
Air Pores
ļ±A cross-section of thallus shows shows 3 distinct regions:
(i) Epidermal region (ii) Photosynthetic region (iii) Storage region
ļ Barrel shaped
ļ Each pore has 4-8 superimposed
tiers of cells
Epidermal Region
ā¢ Includes upper and lower epidermis
ā¢ Upper epidermis forms protective covering
over photosynthetic region
ā¢ Has many air pores that open internally into
air chambers
ā¢ Lower epidermis forms lowermost layer of
thallus
ā¢ Cells of lower epidermis give rise to rhizoids
ļ Each tier consist of a ring of 4-5 cells
ļ The cells of lowermost tier project
inward giving the pore a star-shaped
appearance
ļ Half of tiers project outward and half
project inward
ļ The pores have comparatively wide pore
passage in the middle than on margins
ļ These are analogous to stomata but they
cannot control the pore size like stomata
10. Anatomy
Photosynthetic region
ā¢ Lies below upper epidermis
ā¢ It consists of large air chambers
separated by single layered partition wall
ā¢ Uniform in shape and are arranged in a
horizontal row
ā¢ Many photosynthetic filaments arise
from foot of each chamber
ā¢ The filaments are made of chloroplast
containing cells
11. Storage region
ā¢ Lies below photosynthetic region
ā¢ Compact zone of several layers of polygonal
parenchymatous cells
ā¢ Cells devoid of chloroplast and no intercellular
spaces in between
ā¢ Cells contain starch and protein granules
ā¢ Mucilage and oil containing cells are also present
ā¢ Storage region thick in the centre and tapers
towards the margins
ā¢ Cells of midrib region are elongated and with
reticulate thickenings
Anatomy
12. Reproduction
Vegetative reproduction:
By progressive death and decay
ā¢ Mature cells are present at posterior end and are short-lived
ā¢ New cells are regularly formed by apical cell
ā¢ Death and decay therefore naturally starts from the posterior end
ā¢ As the process of decay reaches the point of dichotomy, two apical
parts of thallus separate
ā¢ Each grows into a new plant
13. Reproduction
By adventitious branches
ā¢ Some species possess adventitious branches on ventral
surface
ā¢ On separation these grow into new thalli
14. Reproduction
By Gemma
ā¢ Gemma cups(2mm X 3mm) are cupules
present on dorsal surface along midrib
region
ā¢ Margins are hyaline, lobed, spiny or entire
ā¢ From floor of gemma cup many small,
stalked, discoid & biconvex gemma arise
ā¢ Gemma is constricted in middle and 2
notches possess a row of apical cells
ā¢ Gemma contains chloroplast containing
cells and rhizoidal cells
ā¢ Some mucilage hairs also arise from
gemma cupās floor which imbibe water and
help in deispersal of gemmae
ā¢ Gemmae on coming in contact with ground
start germinating immediately
15. Sexual Reproduction
ā¢ Marchantia is a heterothallic or dioecious plant
ā¢ Male thallus bears antheridiophores and female thallus bears
archegoniophores
ā¢ They arise from distal end of thallus from growing point and
after their formation growth of thallus ceases
16. Antheridiophore
ā¢ It has 1-3cm long stalk that bears 8 lobed peltate
disc
ā¢ Inner structure similar to that of thallus with
upper epidermis(having air pores), air
chambers(having photosynthetic filaments)
ā¢ Antheridial chambers alternate with air chambers
ā¢ Each antheridial chamber contains a single
antheridium and opens externally by a pore
called ostiole.
ā¢ On each lobe antheridia arise acropetally
ā¢ Antheridiophore has 2 longitudinal grooves which
contain rhizoids and scales
17. Antheridium
ā¢ A mature antheridium is globular or oval with
multicellular stalk
ā¢ Body of antheridium has a single layered sterile jacket
enclosing androcytes which eventually metamorphose
into antherozoids
ā¢ The antherozoid is a minute biflagellate structure
Dehiscence of antheridium:
ā¢ Water enters the antheridial chamber through ostiole
ā¢ Some cells at the distal end disintegrate when they
come in contact with water and hence antheridium
ruptures
ā¢ Antherozoids come out of ostiole like smoke column and
spread on surface of antheridial disc
18. Archegoniophore
ā¢ It has slightly longer stalk(2-5cm) and a
terminal disc which is 8 lobed
ā¢ Archegonia are borne on dorsal surface in
acropetal succession
ā¢ Internal structure is similar to thallus with
upper epidermis having air pores and
underlying air chambers
19. Archegonium
ā¢ The archegonium is a stalked flask shaped
structure with a basal swollen venter and an
elongated neck
ā¢ Venter is surrounded by 1 celled thick sterile
jacket and contains a large egg cell and relatively
small venter canal cell
ā¢ The neck consist of 6 vertical rows of cells called
neck cells which enclose 4-8 neck canal cells
ā¢ Tip of neck has a rosette of 4 cover cells
20. Fertilization
ā¢ Water is essential for fertilization
ā¢ Archegonia are placed upright on archegonial disc
ā¢ Venter canal and neck canal cells degenerate to form
a mucilaginous substance which imbibes water and
results in sparation of cover cells by pressure
ā¢ Antherozoid present on surface of antheridial disc are
splashed by rain drops on to the surface of
archegonial disc
ā¢ They are attracted chemotactically towards the neck
of archegonium
ā¢ Antherozoids enter archegonium and only one fuses
with egg leading to formation of zygote
21. Post fertilization events
(Inversion of Archegonia)
ā¢ After fertilization, archegoniophore elongates
accompanied by rapid growth of central part of
archegonial disc that leads to inversion of archegonia
ā¢ The arrangement of archegonia is also reversed from
acropetal to basipetal
ā¢ This process of inversion is accompanied by
development of one cell thick tissue called perichaetium
or involucre on both sides of each archegonial row
ā¢ Also long, green, finger-like projections arise from
margins of disc known as Rays
22. Sporophyte
ā¢ Zygote develops to form sporophyte
ā¢ It is differentiated into foot, seta and capsule
ā¢ Foot-It is basal bulbous part which anchors and
provides nutrition to sporophyte
ā¢ Seta-It is short stalk that connects foot to
capsule
ā¢ Capsule-It is yellow coloured oval structure and
has a single layered jacket
ā¢ In young sporophyte, capsule encloses
sporogenous mass which differentiate into
spore mother cells and elater mother cells
23. Sporophyte
ā¢ Spore mother cells give rise to spore tetrad by meiosis
and elater mother cells give rise to elaters which are
diploid and sterile
ā¢ During the development of sporophyte from zygote,
the venter wall cells give rise to 2-3 layered protective
covering of sporophyte called calyptra
ā¢ The basal cells of archegonium give rise to one celled
thick collar like outgrowth outside the calyptra called
Perigynium or Pseudoperianth
ā¢ Towards maturity of sporophyte, the seta elongates
and pushes the mature capsule out through calyptra,
perigynium and perichaetium
24. Dehiscence of sporophyte
ā¢ Single layered capsule wall splits into a no. of
longitudinal valves which extend from apex towards
the middle of capsule
ā¢ The valves are rolled back due to annular thickenings
in jacket cells
ā¢ Jerky movement of elaters due to their hygroscopic
nature leads to loosening up of spore mass and
scattering of spores in air
25. Germination of Spores
ā¢ Spores are viable for about a year
ā¢ Under favourable conditions they absorb moisture from substratum and increase
in size
ā¢ Chloroplasts reappear at this stage
ā¢ Spore undergoes repeated divisions to form 6-8 celled filamentous structure with
a rhizoid at one end
ā¢ The apical cell cuts off derivatives on lateral sides and finally give rise to
gametophyte
26. References
ļ¼P.C. Vashistha Bryophytes S. Chand, Delhi, India
ļ¼A Textbook of Botany-- Singh, Pande and Jain
ļ¼Bendre and KumarāPractical Botany Vol.1
ļ¼en.wikipedia.org/wiki/Marchantia
ļ¼www.google.co.in/marchantiaimages