1. The document discusses cross pollination, which is the transfer of pollen from the anther of one plant to the stigma of a different plant.
2. There are two main types of pollination - wind pollination and insect pollination. Wind pollinated flowers have adaptations like small dull flowers and lightweight pollen for wind dispersal, while insect pollinated flowers offer rewards like nectar and scent to attract pollinators.
3. Cross pollination provides advantages like more viable and resistant offspring through genetic recombination, but also disadvantages like less genetic purity and reliance on pollinating agents. Plants use mechanisms like dichogamy and self-sterility to encourage out
The modes of reproduction in crop plants may be broadly grouped into two categories: asexual and sexual.
Sexual reproduction involves the fusion of male and female gametes, whereas in asexual reproduction new plants may develop from vegetative parts of the plant (vegetative reproduction) or may arise from embryos that develop without fertilization (apomixis).
Pollination : Types and significance.
The Seminar presented by Biswajit Das
L.T.K. College, Department of Botany.
In order that a plant is able to produce seeds, the male and female gametes must come together.
The male gamete is produced by the androecium within the pollen grain, while the female gamete is produced by the gynoecium within the ovule.
Pollination is the process that helps in bringing male and female gametes together.
Self-pollination and cross-pollination are two major ways. Flowering plants are adapted to use vivid agents, like biotic and abiotic.
.............................................................. Thank You.
The mating or crossing of two plants or lines of dissimilar genotype is known as hybridization. The chief objective of hybridization is to create genetic variation, when two genotypically different plants are brought together in F1. Here, we are going to discuss about different strategies and tools used for hybridization.
Plant breeding methods of vegetatively propagated crops Roksana Aftab Ruhi
Vegetatively propagated crops are bred by intentionally crossing of closely or distantly related individual to produce new crop varieties or lines with desirable traits. Breeding of vegetative crops have successfully improved quality, yield, tolerance of crops to environmental pressure. Breeding helps in producing crops that are resistant to viruses, fungi and bacteria and helps in longer storage period for the harvested crop.
Self-incompatibility refers to the inability of a plant with functional pollen to set seeds when self pollinated. It is the failure of pollen from a flower to fertilize the same flower or other flowers of the same plant.
This presentation includes, Single-locus self-incompatibility- {Gametophytic self-incompatibility (GSI) and Sporophytic self-incompatibility (SSI)},2-locus gametophytic self-incompatibility, Heteromorphic self-incompatibility,Cryptic self-incompatibility (CSI) and Late-acting self-incompatibility (LSI).
seed is scientifically the mature embryo.
these powerpoint slides include the basic concepts of seed,its importance, parts of seed, composition,seed structure, seed development and embryogenesis.
For CBSE class 10th and 12
Have you ever wondered why bees are attracted to flowers? Flowers look beautiful and are fragrant, but there is a reason behind this – flowers actually help plants to reproduce. Flowering plants have seeds, carry the genetic information of the parents and develop into a new plant.
Explore pollination notes provided here to learn about the process and types of pollination.
Table of Contents
Pollination
Process
Types
The process of pollination begins when the pollen grains from the respective flowers lands on the stigma and form a pollen tube with the style length, which connects both the stigma and ovary. After the completion of the pollen tube, the pollen grain starts transmitting sperm cells from the grain to the ovary.
Later the process of fertilization in plants will take place when the sperm cells will reach the ovary and egg cells. The seed is then released from the parent plant and making it able to grow into a plant and continue the reproductive cycle with the use of the pollination method.
The modes of reproduction in crop plants may be broadly grouped into two categories: asexual and sexual.
Sexual reproduction involves the fusion of male and female gametes, whereas in asexual reproduction new plants may develop from vegetative parts of the plant (vegetative reproduction) or may arise from embryos that develop without fertilization (apomixis).
Pollination : Types and significance.
The Seminar presented by Biswajit Das
L.T.K. College, Department of Botany.
In order that a plant is able to produce seeds, the male and female gametes must come together.
The male gamete is produced by the androecium within the pollen grain, while the female gamete is produced by the gynoecium within the ovule.
Pollination is the process that helps in bringing male and female gametes together.
Self-pollination and cross-pollination are two major ways. Flowering plants are adapted to use vivid agents, like biotic and abiotic.
.............................................................. Thank You.
The mating or crossing of two plants or lines of dissimilar genotype is known as hybridization. The chief objective of hybridization is to create genetic variation, when two genotypically different plants are brought together in F1. Here, we are going to discuss about different strategies and tools used for hybridization.
Plant breeding methods of vegetatively propagated crops Roksana Aftab Ruhi
Vegetatively propagated crops are bred by intentionally crossing of closely or distantly related individual to produce new crop varieties or lines with desirable traits. Breeding of vegetative crops have successfully improved quality, yield, tolerance of crops to environmental pressure. Breeding helps in producing crops that are resistant to viruses, fungi and bacteria and helps in longer storage period for the harvested crop.
Self-incompatibility refers to the inability of a plant with functional pollen to set seeds when self pollinated. It is the failure of pollen from a flower to fertilize the same flower or other flowers of the same plant.
This presentation includes, Single-locus self-incompatibility- {Gametophytic self-incompatibility (GSI) and Sporophytic self-incompatibility (SSI)},2-locus gametophytic self-incompatibility, Heteromorphic self-incompatibility,Cryptic self-incompatibility (CSI) and Late-acting self-incompatibility (LSI).
seed is scientifically the mature embryo.
these powerpoint slides include the basic concepts of seed,its importance, parts of seed, composition,seed structure, seed development and embryogenesis.
For CBSE class 10th and 12
Have you ever wondered why bees are attracted to flowers? Flowers look beautiful and are fragrant, but there is a reason behind this – flowers actually help plants to reproduce. Flowering plants have seeds, carry the genetic information of the parents and develop into a new plant.
Explore pollination notes provided here to learn about the process and types of pollination.
Table of Contents
Pollination
Process
Types
The process of pollination begins when the pollen grains from the respective flowers lands on the stigma and form a pollen tube with the style length, which connects both the stigma and ovary. After the completion of the pollen tube, the pollen grain starts transmitting sperm cells from the grain to the ovary.
Later the process of fertilization in plants will take place when the sperm cells will reach the ovary and egg cells. The seed is then released from the parent plant and making it able to grow into a plant and continue the reproductive cycle with the use of the pollination method.
Pollination in plants is the process where pollen is transferred from the anther, the male part of a flower, to the stigma, the female part of a flower. Pollen can be transferred to one plant or even a nearby plant so that they can get fertilized and make more flowers. This happens in plants that have flowers called angiosperms.
In this lesson you will learn about :
1) What is Pollination?
2) Types of Pollination
3) Self-Pollination
- Adaptations for Self-Pollination
- Advantages and Disadvantages of Self-Pollination
4) Cross-Pollination
- Adaptations for Cross-Pollination
- Advantages and Disadvantages of Cross-Pollination
5) Agents of Cross-Pollination
- Entomophilous
- Anemophilous
- Hydrophilous
6) Artificial Pollination
I hope this document is helpful to you. Please share the document with your friends if you think this will benefit them. Get ready for the next lesson. Thanks.
Pollination Detailed Explanation with examples Sumita Sinha
Pollination and Its types with examples.Contrivances of self - Pollination and Cross - Pollination.Agents of Pollination is also clearly mentioned.The topic is clearly explained with relevant images for better understanding.
Pollination, transfer of pollen grains from the stamens, the flower parts that produce them, to the ovule-bearing organs or to the ovules (seed precursors) themselves. In plants such as conifers and cycads, in which the ovules are exposed, the pollen is simply caught in a drop of fluid secreted by the ovule. In flowering plants, however, the ovules are contained within a hollow organ called the pistil, and the pollen is deposited on the pistil’s receptive surface, the stigma. There the pollen germinates and gives rise to a pollen tube, which grows down through the pistil toward one of the ovules in its base. In an act of double fertilization, one of the two sperm cells within the pollen tube fuses with the egg cell of the ovule, making possible the development of an embryo, and the other cell combines with the two subsidiary sexual nuclei of the ovule, which initiates formation of a reserve food tissue, the endosperm. The growing ovule then transforms itself into a seed.
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Presentation Includes very important topics related to Pollination and Double Fertilization in Flowering Plants (Angiosperms). The presentatio will be important for Class XII and X students as well many questions can be asked from the presentation.
From the forgoing presentation, it can be concluded that breeding characters viz., flowering period, inflorescence, time of flower opening, time of anther dehiscence, time of stigma receptivity, pollinating agent ,time of visitor of pollinating agent and fruit set (%) in tropical species are required to be studied as they are vital for any improvement and eco-environmental planning purposes. It also throws light on how species adopts itself along with the phenomenon of speciation and reproductive isolation. From these characters we can introduce new variety which is essential for further evaluation and also the identification of the interactions between biological factors, such as animal, plant species, and non-biological factors, like temperature, RH, rain and wind, helps us to elaborate management and conservation plans for the ecosystems of the planet, which have become more and more necessary due to highly increased rate of deterioration of different ecosystems during the last few decades.
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9. CROSS POLLINATION:
When pollen grains of the flower of one plant are
transferred to the stigma of the flower on the other
plant of same or different species is called as cross
pollination.
It occurs in unisexual as well as bisexual flowers.
It is common in nature.
Xenogamy Hybridization
Cross pollination
10. Xenogamy:
The process in which the pollen grains are
transferred to the flower of
other plant of the same species is known as
xenogamy.
Eg- Papaya, Castor.
11. Hybridization:
The process in which the pollen grains are
transferred to the flower of
other plant of the different species or variety is
known as hybridization.
It is mostly done artificially.
12. Feature Reason
small petals, often brown or dull
green
no need to attract insects
no scent no need to attract insects
no nectar no need to attract insects
pollen produced in great
quantities
because most does not reach
another flower
pollen very light and smooth so it can be blown in the wind
anthers loosely attached and dangle out to release pollen into the
wind
stigma hangs outside the flower to catch the drifting pollen
stigma feathery or net like to catch the drifting pollen
Wind Pollinated Flowers
13. Feature Reason
large, brightly coloured petals to attract insects
often sweetly scented to attract insects
usually contain nectar to attract insects
moderate quantity of pollen less wastage than with wind
pollination
pollen often sticky or spiky to stick to insects
anthers firm and inside flower to brush against insects
stigma inside the flower so that the insect brushes against it
stigma has sticky coating pollen sticks to it
Insect Pollinated Flowers
16. Adaptations for cross pollination
1. Dicliny(Unisexuality):-presence of unisexual flower.
2. Dichogamy :-stamens and carpels of flower do not
mature at same time
• Protandry :-Anther of flower mature earlier than
carpel. ex salvia & sun flower
• Protogyny:-the carpel of flower mature earlier than
stamens. Bajra
3. Chasmogamy or anthesis:-opening of floral bud in the
form of a flower.
17. ADVANTAGES-
•New varieties of plants can be produced.
•The progeny shows advanced vigour.
•Off springs are more viable and resistant.
•It is responsible for genetic recombination.
•It leads in production of seeds in self sterile
plants
•It introduces new desirable characters and eliminated
undesired one’s.
DISADVANTAGES-
• More wastage of pollen grain is seen.
• Pollinating agents are required.
• It is not a sure method of pollination.
• Genetic purity is not maintained.
• Plants have to develop various devices to
attract agents for pollination.
• It is not an economical method.
18. METHODS TO ENSURE CROSS POLLINATION
Dichogamy :
Anthers and stigmas mature at different
times in a bisexual flower so as to prevent
self pollination.
- Protandry Anthers mature earlier than
stigma of the same flower. Their pollen
grains become available to stigmas of the
older flowers, e.g., Sunflower, Salvia,
- Protogyny
Stigmas mature earlier so that they get
pollinated before the anthers of the same
flower develop pollen grains, e.g., Mirabilis
jalapa (Four O’Clock), Gloriosa, Plantago.
19. Herkogamy :
In some bisexual flowers the
structure of male & female sex
organs itself prove a barrier to self
pollination.
Self Sterility (Self
Incompatibility):
Pollen grains of a flower do not
germinate on the stigma of the
same flower due to presence of
similar self sterile gene (S,S3 in
pistil and S1 or S3 in pollen grain),
e.g., Tobacco, Potato, Crucifers.
20. Heterostyly :
There are 2 or 3 types of flowers with different heights of styles and stamens.
(a) Diheterostyly (Dimorphic Heterostyly):
There are two types of flowers
- Pin eyed (long style and short stamens)
- Thrum eyed (short style and long stamens), e.g., Primula (Primrose),
(b) Triheterostyly (Trimorphic Heterostyly or tristyly):
There are three types of flowers with different heights of styles.
e.g., Lythrum. Pollination occurs between anthers and stigmas of the same
height present in different flowers
21. ARTIFICIAL POLLINATION OR HYBRIDIZATION
This technique is used for the purpose of
Hybridization.
It involves pollination of desired female parents with
pollen from the desired male parent, taking all
precautions to prevent contamination of stigma with
undesired pollen.
In unisexual plants the procedure is simple but its
complicated in bisexual ones.
2 processes that takes place in bisexual flower :
- Emasculation
- Bagging
22.
23. IMPORTANCE OF CROSS POLLINATION:
ADVANTAGES
Cross pollination
introduces genetic re-
combinations and hence
variations in the progeny.
Cross pollination
increases the adaptability
of the offspring towards
changes in the
environment.
It makes the organisms
better fitted in the struggle
for existence.
The plants produced
through cross pollination are
more resistant to diseases.
DISADVANTAGES
•A factor of chance is always
involved in cross .pollination.
•It is less economical.
•Some undesirable characters
may creep in the race.
•The very good characters of the
race are likely to be spoiled.
24. COEVOLUTION OF FLOWER AND ITS POLLINATOR SPECIES:
Coevolution is the evolution in two species that interact
extensively with one another so that each acts as a major
force of natural selection on the other.
When one evolves a new feature or modifies itself, the
other evolves new adaptations in response of it.
This constant mutual feed back modification between the two
species is known as coevolution.
The coevolution of the flower and its pollinator species are
tightly linked with one another.
25. Disa nivea is a rare orchid found only in a few places in South Africa,
and until Johnson came to study it, no one knew how it was
pollinated. After a lot of patient orchid-watching, he and his colleagues
discovered that it is visited exclusively by the fly shown in the picture.
Its proboscis is well-matched to the length of the orchid, and the
orchid grows pollen in just the right place so that they get stuck to the
fly. You can see them in this picture–the two dangling yellow packets
on the fly’s snout. This fly is named as Orchid fly.
26. Pollination is a vital process of nature.
It is estimated that ¾ of our staple crops, and 1/3 of all food crops
require pollination.
For the fruit seeds to develop, pollen has to be transferred
between two flowers of the same species, which then fertilizes the
flower and allows the production of healthy seeds on the plant.
Pollinators play an essential role in pollination as they work as
medium for pollination to be occur.
he most widely known pollinators are honey bees. Honey bees
are responsible for the pollination and thus production of $19 billion
worth of food crops each year, just in the United States alone!
There are many other pollinators that are just as vital
to food crop productions and plant reproduction as honey bees, but
aren’t as well known such as wasps, moths, flies, butterflies,
beetles, bats, birds, and ants.