Introduction, characteristics, classification,Thallus organisation,reproduction and its types, algal blooms, causes of algal blooms, biological and economic importance of algae.
B.SC 1st Year (BOTANY)
About 20,000 species.
Eukaryotic cell and contain all the membrane bound organelles.
Thallus is green due to the presence of green pigment chlorophyll.
Chlorophyll is contained in chloroplast.
Pyrenoids embedded in chloroplast.
Cytoplasm contains vacuoles.
Motile cell of primitive forms contains eye spot or stigma.
Reserve carbohydrates are in the form of starch.
Cell wall invariably contains cellulose.
Produce motile reproductive bodies generally with two or four flagella.
Most are aquatic but some are subarial.
Several species of ulvales and siphonales are marine.
Some strains of chlorella are thermophilic.
Species of chlamydomonas and some chlorococcales occur in snow.
Coloechaete nitellarum is endophytic.
Cephaleuros is parasitic – cause ‘red rust of tea’.
Live epizoically on or endozoically within the bodies of lower animals – chlorella is found in hydra; chlorella beneath the scales of fish; characium on the antennae of mosquito.
Green algae in assosciation with the fungi constitute lichens.
The plant body in algae is always a thallus. It is not differentiated in root, stem and leaves. Algae range in size from minute unicellular plants (less than 1 µ in diameter in some planktons) to very large highly differentiated multicellular forms e.g., some sea-weeds.
Their forms may be colonial (loose or integrated by inter-connections of protoplasmic strands), filamentous (branched or un-branched), septate (branched or un-branched), non-septate or branched, multinucleate siphonaceous tube where the nuclear divisions occur without usual septa formation.
The algae reproduce by vegetative, asexual, and sexual methods. Vegetative reproduction is by fragmentation, where each fragment develops into a thallus. Asexual reproduction is by the production of flagellated zoospores which on germination give rise to new plants.
About 20,000 species.
Eukaryotic cell and contain all the membrane bound organelles.
Thallus is green due to the presence of green pigment chlorophyll.
Chlorophyll is contained in chloroplast.
Pyrenoids embedded in chloroplast.
Cytoplasm contains vacuoles.
Motile cell of primitive forms contains eye spot or stigma.
Reserve carbohydrates are in the form of starch.
Cell wall invariably contains cellulose.
Produce motile reproductive bodies generally with two or four flagella.
Most are aquatic but some are subarial.
Several species of ulvales and siphonales are marine.
Some strains of chlorella are thermophilic.
Species of chlamydomonas and some chlorococcales occur in snow.
Coloechaete nitellarum is endophytic.
Cephaleuros is parasitic – cause ‘red rust of tea’.
Live epizoically on or endozoically within the bodies of lower animals – chlorella is found in hydra; chlorella beneath the scales of fish; characium on the antennae of mosquito.
Green algae in assosciation with the fungi constitute lichens.
The plant body in algae is always a thallus. It is not differentiated in root, stem and leaves. Algae range in size from minute unicellular plants (less than 1 µ in diameter in some planktons) to very large highly differentiated multicellular forms e.g., some sea-weeds.
Their forms may be colonial (loose or integrated by inter-connections of protoplasmic strands), filamentous (branched or un-branched), septate (branched or un-branched), non-septate or branched, multinucleate siphonaceous tube where the nuclear divisions occur without usual septa formation.
The algae reproduce by vegetative, asexual, and sexual methods. Vegetative reproduction is by fragmentation, where each fragment develops into a thallus. Asexual reproduction is by the production of flagellated zoospores which on germination give rise to new plants.
The slides has been edited. visit for new one on https://www.slideshare.net/alihaider408/stelar-system-stele-its-types-and-evolutionedited-182037813
Sorry for inconvenience.
Stele is defined as a central vascular cylinder, with or without pith and delimited the cortex by endodermis.
Van Tieghem and Douliot (1886) recognized only three types of steles.
1-Protostele
2-Siphonostele
3-Solenostele
Stelar Theory:
Major highlights of stellar theory are:
Stele is a real entity and present universally in all higher plants.
Cortex and stele are two fundamental parts of a shoot system
Stele and cortex are separated by endodermis
Introduction,In some fungi ,true sexual cycle comprising of nuclear fusion and meiosis is absent.
These fungi derive the benefits of sexuality through a cycle know as parasexuaL cycle.
First Reported by- Gudio Pontecorvo and J.A.Roper(1952)
Parasexual cycle was reported in
Aspergillus nidulans,the imperfect stage of Emericella nidulans.
Since then parasexual cycle has been discovered not only in several members of Deutromycetes but also in fungi belonging to Ascomycetes and Basidiomycetes.
DEFINETION - Parasexuality is defined as a cycle in which Plasmogamy, Karyogamy and Meiosis [Haploidization] take place in sequence but not at a specified time or at specified points in the life cycle of an organism.
Generally parasexual cycle occurs in those fungi in which true sexual cycle does not take place.
Parasexualcycle also know as Somatic recombination. PASEXUALITY ALSO REPORTED IN SOME ORGANISMS- Aspergillus nigar, Penicillium crysogenum, STEPS OF PARASEXUAL CYCLE - 1) ESTABLISHMENT OF HETEROKARYOSIS, 2) Formation of Heterozygous DIPLOIDS, 3) occasional mitotic crossing-over during multiplication of diploid nuclei, 4)occasional haplodization through aneuploidy , COMPARISION BETWEEN SEXUAL AND PARASEXUAL CYCLE, IMPORTANCE OF PARASEXUALITY, C0NCLUSION
This lecture is about classification of algae. In this presentation outline of Fritsch's and Smith's classifications are given. Helpful for B. Sc. students.
This maybe of help for UG+PG Botany students studying mycology. It's about the general account of class Chytridiomycetes. Good for quick revision and information.
*Critics are very welcomed*
Microbiology - Algae
Algae is an informal term for a large and diverse group of photosynthetic eukaryotic organisms. It is a polyphyletic grouping that includes species from multiple distinct clades.
Algae are sometimes considered plants and sometimes considered "protists" (a grab-bag category of generally distantly related organisms that are grouped on the basis of not being animals, plants, fungi, bacteria, or archaeans).
The slides has been edited. visit for new one on https://www.slideshare.net/alihaider408/stelar-system-stele-its-types-and-evolutionedited-182037813
Sorry for inconvenience.
Stele is defined as a central vascular cylinder, with or without pith and delimited the cortex by endodermis.
Van Tieghem and Douliot (1886) recognized only three types of steles.
1-Protostele
2-Siphonostele
3-Solenostele
Stelar Theory:
Major highlights of stellar theory are:
Stele is a real entity and present universally in all higher plants.
Cortex and stele are two fundamental parts of a shoot system
Stele and cortex are separated by endodermis
Introduction,In some fungi ,true sexual cycle comprising of nuclear fusion and meiosis is absent.
These fungi derive the benefits of sexuality through a cycle know as parasexuaL cycle.
First Reported by- Gudio Pontecorvo and J.A.Roper(1952)
Parasexual cycle was reported in
Aspergillus nidulans,the imperfect stage of Emericella nidulans.
Since then parasexual cycle has been discovered not only in several members of Deutromycetes but also in fungi belonging to Ascomycetes and Basidiomycetes.
DEFINETION - Parasexuality is defined as a cycle in which Plasmogamy, Karyogamy and Meiosis [Haploidization] take place in sequence but not at a specified time or at specified points in the life cycle of an organism.
Generally parasexual cycle occurs in those fungi in which true sexual cycle does not take place.
Parasexualcycle also know as Somatic recombination. PASEXUALITY ALSO REPORTED IN SOME ORGANISMS- Aspergillus nigar, Penicillium crysogenum, STEPS OF PARASEXUAL CYCLE - 1) ESTABLISHMENT OF HETEROKARYOSIS, 2) Formation of Heterozygous DIPLOIDS, 3) occasional mitotic crossing-over during multiplication of diploid nuclei, 4)occasional haplodization through aneuploidy , COMPARISION BETWEEN SEXUAL AND PARASEXUAL CYCLE, IMPORTANCE OF PARASEXUALITY, C0NCLUSION
This lecture is about classification of algae. In this presentation outline of Fritsch's and Smith's classifications are given. Helpful for B. Sc. students.
This maybe of help for UG+PG Botany students studying mycology. It's about the general account of class Chytridiomycetes. Good for quick revision and information.
*Critics are very welcomed*
Microbiology - Algae
Algae is an informal term for a large and diverse group of photosynthetic eukaryotic organisms. It is a polyphyletic grouping that includes species from multiple distinct clades.
Algae are sometimes considered plants and sometimes considered "protists" (a grab-bag category of generally distantly related organisms that are grouped on the basis of not being animals, plants, fungi, bacteria, or archaeans).
Cyanophyceae or Myxophyceae is a group of prokaryotic organisms, commonly called blue-green algae. Since their cellular organization is typically prokaryotic, the current trend is to consider them not as true algae, but as monerans. Accordingly, they are now grouped under Sub-kingdom Cyanobacteria of Kingdom Monera. The name Cyanophyceae or blue-green algae denotes the presence of the blue-green pigment phycocyanin; the name Myxophyceae refers to the presence of the carotenoid pigment myxoxanthin.
(i) Most members are filamentous forms, but some are unicellular and some others are colonial.(ii) Filamentous forms consist of a linear row of cells, called trichome, enclosed by a common sheath. Trichome may have some large and thick-walled cells, called heterocysts.(iii) Cells are typically prokaryotic, without membrane-bound cell organelles and an organized nucleus.
(iv) Chief pigments are chlorophyll-a, phycocyanin, allophycocyanin, phycoerythrin, myxoxanthin, oscillaxanthin, ß-carotene and leutein.(v) Reserve food include cyanophysean starch (glycogen) and cyanophysin (a protein).(vi) Protoplast is differentiated into outer chromoplasm and inner centroplasm. (vii) Flagella are altogether absent at any stage.(viii) Reproduction is asexual
Introduction of algae and general characteristics
Fossil history of algae
Endosymbiosis Theory
Where are algae abound? Ecology
Algal Blooms
Eutrophication
How are algae similar to higher plants?
How are algae different from higher plants?
Variations in the pigment constitution
Prokaryotic vs eukaryotic algae...............
Presentation
BEST OF LUCK
La botánica (del griego βοτάνη, 'hierba') o fitología (del griego φυτόν, 'planta' y λόγος, 'tratado') es la rama de la biología que estudia las plantas bajo todos sus aspectos, incluyendo la descripción, clasificación, distribución, identificación, estudio de la reproducción, fisiología, morfología, relaciones recíprocas, relaciones con los otros seres vivos y efectos provocados sobre el medio en el que se encuentran.
Algae are chlorophyll bearing autotrophic bodies with thalloid plant body. Thallus may be unicellular to multicellular, microscopic or macroscopic in structure.
cell lineage , cell fate - diverse class of cell fate, cell fate in plant meristem, mammalian development cell fate, nutritional effects on epigenetics, epigenetics of plants,
control of cell fate.
GENETIC POLYMORPHISM -
types of genetic polymorphism,
reasons why issue of cultivated plants are not fully resolved,
and strategies and innovations to fulfill demand of population.
Kohlbergs moral development, Erik erikson's stages and Factors affecting grow...nishakataria10
Continuation with last upload
Kohlbergs moral development theory, its stages and criticism,
Erik erikson's stages of psychological development - conflicts during each stage,
Factors affecting growth and development.
B.Ed first year notes
CHILD DEVELOPMENT STAGES AND PIAGET'S THEORYnishakataria10
Concept, principles, stages of development,
Piagets theory of cognitive development, its stages and important terma about the theory
B.ed first year notes.
ROOT HAIR DEVELOPMENT IN PLANTS:
structure and development of root hairs, Initiation and molecular genetics of root hair, functions of root hairs.
complete topic from authentic websites. Essential for for all life science students.
Phytogeographical zones, farmers rights, intellectual property rights, Plant exploration, plant introduction and plant invasion, invasion species, deforestation and social forestry, Ramsar convention on wetlands, Role of botanical gardens, cryobanks, seed bank in biodiversity, cryopreservation, NBPGR, CBD, NBA, Ethnobotany,
Biodiversity- National and Global status, Hotspots of biodiversity Endangered and endemic species, Extinction, Significance, Causes, Levels of biodiversity, IUCN categories of threat, Red Data Book - advantages and disadvantages, local plants diversity of haryana, Biodiversity concepts, principles of conservation and strategies, major approaches to management, Protected areas network- wildlife sanctuaries, national parks, biosphere reserves.
fungi: heterothallism, heterokaryosis, parasexuality,fungi sex hormones, Mycorrhizae, Types of mycorrhizae, Defence mechanism in plants- structural and biochemical.
Structure of bacteria, its characteristics, Reproduction, bacterial shapes, types of bacteria , Difference bw gram positive and gram negative bacteria, Economic importance of bacteria,Quiz questions.
Self identity, self esteem and its types, inner self, aspects of development of inner self and its strategies, personality ,self expression and its forms, social interaction and group influence.
useful for B.ed students (first year).
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3. “Alga is a term that describes a large and incredibly diverse group of
eukaryotic, photosynthetic lifeforms”.
These organisms do not share a common ancestor and hence, are not
related to each other (polyphyletic).
It is an important group of Thallophyta (Gr. Thallos — a sprout;
phyton — a plant), the primitive and simplest division of the plant
kingdom.
The orderly systematic study of algae is called Phycology (Gr.phycos
— seaweeds; logos — study or discourse).
4. Characteristics of Algae
•Algae are photosynthetic organisms
•Algae can be either unicellular or multicellular organisms
•Algae lack a well-defined body, so, structures like roots, stems or leaves are absent
•Algae are found where there is adequate moisture.
•Reproduction in algae occurs in both asexual and sexual forms. Asexual reproduction
occurs by spore formation.
•Algae are free-living, although some can form a symbiotic relationship with other
organisms.
5.
6.
7.
8. Thallus Organisation in Algae:
The algal thalli are grouped into the
following, based on their organization:
A. Unicellular Algae:
Unicellular forms of algae are also called
acellular algae as they function as complete living
organisms.
Unicellular forms are common in all the groups
of algae except Rhodophyceae, Phaeophyceae
and Charophyceae.
The unicells may be motile or non-motile.
The motile unicells are either rhizopodial or
flagellated.
9. The non-motile cells may be
spiral filament as found in
Spirulina (Cyanophyceae)
The coccoid unicellular algae are
the simplest forms of algae found
in
o Cyanophyceae,
o Chlorophyceae etc., e.g.,
Gloeocapsa, Chlorella
10. B. Multicellular Algae:
1. Colonial:
o The colonial habit is achieved by loose
aggregation of cells within a common
mucilaginous investment.
o The cells of these usually remain connected
with each other by cytoplasmic threads.
a. Coenobium:
When a colony has a definite number of cells
with a definite shape and arrangement, it is
called coenobium.
11. Coenobium may be:
i. Motile, or
ii. Non- motile.
• i. In motile form, cells are flagellated and
whole coenobium can move by the
organised beating action of flagella, e.g.,
Volvox , Pandorina, Eudorina etc.
• In Volvox the coenobium is a hollow
sphere.
ii. In non-motile form, the cells are without
flagella, thereby the coenobium is non-
motile,
e.g., Scenedesmus (Fig. 3.3C), Hydro-
dictyon
12. Aggregated Form:
Unlike coenobium the cells are
aggregated irregularly showing a
colonial mass of various size and
shape.
It is of three types:
i. Palmelloid,
ii. Dendroid, and
iii. Rhizopodial.
13. i. Palmelloid:
In this type the non- motile cells
remain embedded in an amorphous
gelatinous or mucilaginous matrix.
Each and every cell of the
organisation is independent and
can perform all the functions as an
individual.
Chlamydomonas and Chromulina
represent palmelloid as a
temporary feature in their life cycle.
14. ii. Dendroid:
o In this type the number, shape and
size of the cell is variable.
o They look like microscopic trees (e.g.,
Prasinocladus, Ecballocystis,
Chrysodendron, .
o A mucilaginous thread is present at
the base of each cell, thus showing a
sort of polarity.
iii. Rhizopodial:
In this type the cells are united through
rhizopodia. e.g., Chrysidiastrum
15. Filamentous:
The filamentous plant body is formed through repeated
cell divisions in a single plane and in a single direction,
where the cells remain firmly attached to each other —
end to end forming a chain or a thread.
The filaments may be unbranched or branched.
a. Unbranched Filament:
It may be free-floating (e.g., Spirogyra,) or attached to
the substratum (e.g., Ulothrix, Oedogonium, etc.).
The free-floating unbranched filaments are not
differentiated into basal and apical ends.
All the cells in the filament are alike.
But the Unbranched filaments that remain attached to
the substratum are differentiated into base and apex.
16. b)Branched Filament:
It is formed when a filament occasionally starts
division in a second plane.
It is of two types:
i. Falsely branched, and
ii. Truly branched.
i. Falsely Branched:
The trichomes of blue greens may break either
due to death or decay of the intercalary cells.
The broken ends emerge out of the mucilaginous
sheath in the form of a branch.
They do not arise as lateral outgrowths, e.g.,
Scytonema
17. ii. Truly Branched:
When a cell in the filament
occasionally starts division in
a second plane, true branch is
formed.
Thus true branches arise as
lateral outgrowths of the
main filament.
True branches are of the
following three types: Simple
filament, Heterotrichous
habit, and
Pseudoparenchymatous
habit.
18. Reproduction in Algae
(A) Vegetative Reproduction:
Vegetative reproduction in algae takes place by the
following methods:
(i) Fragmentation:
o The filamentous thallus breaks into fragments, and
each fragment is capable of forming new thallus.
o Fragmentation can take place due to mechanical
pressure, insect bite etc.
o The common examples are Ulothrix, Spirogyra,
Oedogoniwn, Zygnema, Oscillatoria etc.
19. (ii) Fission:
Fission is common in desmids, diatoms and other
unicellular algae. The cell divides mitotically into two the
cells are separated by septum formation
(iii) Adventitious branches:
Adventitious branches like protonema develop on
rhizoids of Chara. On detachment they form new thalli.
Similar adventitious structures are formed on thalli of
Dictyota and Fucus.
(iv) Hormogonia:
In blue green algae like Nostoc, Cylindrospermum, the
main filament breaks into small fragments of varying
length called hormogonia. The hormogonia may be
formed at the place of heterocyst in the filaments.
20. (B) Asexual Reproduction:
o Asexual reproduction takes place with
the help of some spores and
structures.
o Fertilization and fusion of nuclei does
not take place.
o The reproduction takes place only by
protoplasm of the cell.
Different methods of asexual
reproduction are:
o Aplanospores - are formed under
unfavorable conditions.
o Aplanospores are non-motile
structures, in which protoplasm gets
surrounded by thin cell wall.
o The aplanospores on release form new
plants, e.g., Ulothrix.
21. Hypnospores - are thick walled structures.
These are formed during unfavorable
conditions.
Under prolonged unfavorable conditions, the
protoplasm of hypnospores divides to make
cysts.
The cysts are capable of forming new thallus.
e.g., Chlamydomonas nivalis.
o Tetra spores - are non-motile spores formed
in some members of Rhodophyceae and
Phaeophyceae.
o In Polysiphonia, tetra spores are formed in
tetra sporangia by reduction division on
special tetrasporophytic plants.
22. Sexual reproduction takes place by fusion of gametes of different sexuality.
The gametes are formed in gametangia by simple mitotic division or by
reduction division.
The haploid gametes fertilize to make diploid zygote
Sexual reproduction
Hologamy:
In hologamy the unicellular thallus of opposite
strains (-) and (+) behaves as gametes directly. The
thalli fuse to make diploid zygote e.g.,
Chlamydomonas.
Autogamy:
In autogamy two gametes of same mother cell fuse
to form diploid zygote. Since both gametes are
formed by same cell there is no genetic
recombination e.g., diatoms.
25. An algal bloom or algae bloom is a rapid increase or
accumulation in the population of algae in freshwater or
marine water systems, and is often recognized by the
discoloration in the water from their pigments.
The term algae encompasses many types of aquatic
photosynthetic organisms, both macroscopic, multicellular
organisms like seaweed and microscopic, unicellular
organisms like cyanobacteria.
Algal bloom commonly refers to rapid growth of microscopic,
unicellular algae, not macroscopic algae.
An example of a macroscopic algal bloom is a kelp forest.
26. Algal blooms are known to be mainly composed of
bio-toxins and are characterized by a distinct
discoloration of water due to a large number of
pigmented algae cells.
The colors range from green, red, brown, and
yellow. The major types of algal blooms are
cyanobacteria (blue-green algae) and red tides
(red algal blooms).
27.
28. Causes of Algal Bloom in Aquatic Ecosystems
1. Runoff of Nutrients
An algal bloom is mostly caused by the presence of
large amounts of nitrogen and phosphorus present in
water. These nutrients are washed away from lands
and farms that are heavily riddled with nitrogenous
and phosphatic fertilizers.
Rain acts as an agent by washing these leachable
nutrients from the soil into water bodies such as rivers
and streams, which eventually end up in large
reservoirs such as lakes and oceans.
29. 2. High Temperatures
The global world is facing the destruction of the ozone layer caused by global
warming. This is one of the main reasons algal bloom is thriving at a fast rate.
Conducive temperature is needed for certain bacteria to survive both in and out of
water.
3. Presence of Dead Organic Matter
Generally, there are many kinds of bacteria present in the atmosphere, as well as in
water. They are all in search of suitable media for growth and nutrition.
4. Slow-moving Water
Algal blooms need large masses of water, which are almost still to thrive. Most of the
blue-green algae prefer stable water conditions with low flows, long retention times,
light winds and minimal turbulence; other prefer mixing conditions and turbid
environments.
30. 5. Light
When blue-green algae populations are exposed to long periods of high light
intensity (photo-inhibition), these are diminished but have optimal growth when
intermittently exposed to high light intensities. These conditions prevail under the
water surface, where the light environment is fluctuating.
6. Turbidity
The presence of suspended particles and organic matter (flocs) in the water column
cause turbidity. High turbidity occurs when a lot of water is running through the
system (high discharge after a rain event). Low turbidity occurs when there is only a
small amount of suspended matter present in the water column.
31.
32. 1.Algae Constitute the Link of Food
Chain
2.Algae is Useful in Fish Culture
3.Algae is Used for Recreational
Purposes
4.Algae is Useful in Sewage
Treatment Plants
5.Algae and Water Supplies
6.Algae as the Origin of Petroleum
and Gas
7.Algae and Limestone Formation
33. 1.Algae is Used in Space Research
and Other Fundamental Studies
2.Algae is Used as Food
3.Algae is Used as Fodder
4.Algae is Used as Fertilizers
5.Algae is Used as Medicine
6.Industrial Utilization of Algae