attracted to flowers and sit on them, and when they fly off, they carry with them the pollen grains to the flowers. This dispersing of pollen grains helps in cross pollination of flowers, as a result of which, seeds are produced. In this way, plants and trees multiply on their own.
Fragrance of flowers attract insects which help in pollination. Different flowers contain different oils, which give them a specific fragrance. As these oils gradually keep on evaporating, the fragrance of the flowers spreads in the air. In fact, perfumes are prepared form the oils extracted from these flowers. There are various processes of making perfumes. In one process, flowers are kept in a pot through which steam is passed. The outgoing steam, takes out the oil, which is then passed through water. The oil brought out by the steam starts floating on water. This is then separated. There are other methods too.
France produces the maximum amount of perfumes. It has been found that one ounce of rose perfume is extracted from 110 of rose flowers. Pan Flowers like rose,darus, lavender, jasmine, etc., are generally used for making perfumes.
Flowers of many plant species produce a scent. This scent is typically a complex mixture of low molecular weight compounds emitted by flowers into the atmosphere and its structure, color and odor are critical factors in attracting pollinators. Although flowers can be identical in their color or shape, there are no two floral scents that are exactly the same because of the large diversity of volatile compounds and their relative abundances and interactions. Thus, scent is a signal that directs pollinators to a particular flower whose nectar and/or pollen is the reward. Volatiles emitted from flowers function as both long- and short-distance attractants and play a prominent role in the localization and selection of flowers by insects, especially moth-pollinated flowers, which are detected and visited at night. Species pollinated by bees and flies have sweet scents, whereas those pollinated by beetles have strong musty, spicy, or fruity odors.
To date, little is known about how insects respond to individual components found within floral scents, but it is clear that they are capable of distinguishing among complex scent mixtures. In addition to attracting insects to flowers and guiding them to food resources within the flower, floral volatiles are essential in allowing insects to discriminate among plant species and even among individual flowers of a single species. For example, closely related plant species that rely on different types of insects for pollination produce different odors, reflecting the olfactory sensitivities or preferences of the pollinators. By providing species-specific signals, flower fragrances facilitate an insect's ability to learn particular food sources, thereby increasing its foraging efficiency. At the same time, successful pollen transfer (and thus, sexual reproduction) is ensured, which is beneficial to plants..
Plants tend to have their scent output at maximal levels only when the flowers are ready for pollination and when its potential pollinators are active as well. Plants that maximize their output during the day are primarily pollinated by bees or butterflies, whereas those that release their fragrance mostly at night are pollinated by moth and bats. During flower development, newly opened and young flowers, which are not ready to function as pollen donors, produce fewer odors and are less attractive to pollinators than are older flowers. Once a flower has been sufficiently pollinated, quantitative and/or qualitative changes to the floral bouquets lead to a lower attractiveness of these flowers and help to direct pollinators to unpollinated flowers instead, thereby maximizing the reproductive success of the plant.
Flowering plants produce volatile chemicals in flowers which evaporate into the air and produce their fragrances (pleasant or sometimes unpleasant -- at least to humans). Presumably, these specific flower fragrances attract pollinating insects, but this is not necessarily so, since we don't know whether insects "smell" the same way humans do.
But indeed, gardening is a rewarding experience. Not for one reason, but for numerous reasons. One of the most apparent rewards is a beautiful display of flowers. Flowers have evolved into specialized pollination machines. Some cross-pollinated plants are anemopholous, or wind-pollinated. These plants tend to have inconspicuous flowers and produce a lot of pollen, because wind currents cannot selectively identify which plants are receptive to specific pollen. On the other hand, flowers pollinated by insects (entomophilous flowers) often advertise themselves. One way to advertise is by colors. Another interesting way to advertise is by flower fragrances.
- See more at: http://www.mayflower.in/blog/64/why-do-flowers-have-fragrance.html#sthash.kx4Cyby8.dpuf
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Whenever we pass thorough garden during the spring season, the fragrance of flowers
enchants us. Nature has endowed flowers with beauty, attractive colors,
nectar and fragrance. Insects and flies get attracted to flowers and
sit on them, and when they fly off, they carry with them the pollen
grains to the flowers. This dispersing of pollen grains helps in cross
pollination of flowers, as a result of which, seeds are produced. In
this way, plants and trees multiply on their own.
Fragrance
of flowers attract insects which help in pollination. Different flowers
contain different oils, which give them a specific fragrance. As these
oils gradually keep on evaporating, the fragrance of the flowers spreads
in the air. In fact, perfumes are prepared form the oils extracted from
these flowers. There are various processes of making perfumes. In one
process, flowers are kept in a pot through which steam is passed. The
outgoing steam, takes out the oil, which is then passed through water.
The oil brought out by the steam starts floating on water. This is then
separated. There are other methods too.
France
produces the maximum amount of perfumes. It has been found that one
ounce of rose perfume is extracted from 110 of rose flowers. Flowers
like rose, Pandarus, lavender, jasmine, etc., are generally used for making perfumes.
Flowers
of many plant species produce a scent. This scent is typically a
complex mixture of low molecular weight compounds emitted by flowers
into the atmosphere and its structure, color and odor are critical
factors in attracting pollinators. Although flowers can be identical in
their color or shape, there are no two floral scents that are exactly
the same because of the large diversity of volatile compounds and their
relative abundances and interactions. Thus, scent is a signal that
directs pollinators to a particular flower whose nectar and/or pollen is
the reward. Volatiles emitted from flowers function as both long- and
short-distance attractants and play a prominent role in the localization
and selection of flowers by insects, especially moth-pollinated
flowers, which are detected and visited at night. Species pollinated by
bees and flies have sweet scents, whereas those pollinated by beetles
have strong musty, spicy, or fruity odors.
To
date, little is known about how insects respond to individual
components found within floral scents, but it is clear that they are
capable of distinguishing among complex scent mixtures. In addition to
attracting insects to flowers and guiding them to food resources within
the flower, floral volatiles are essential in allowing insects to
discriminate among plant species and even among individual flowers of a
single species. For example, closely related plant species that rely on
different types of insects for pollination produce different odors,
reflecting the olfactory sensitivities or preferences of the
pollinators. By providing species-specific signals, flower fragrances
facilitate an insect's ability to learn particular food sources, thereby
increasing its foraging efficiency. At the same time, successful pollen
transfer (and thus, sexual reproduction) is ensured, which is
beneficial to plants.
Plants
tend to have their scent output at maximal levels only when the flowers
are ready for pollination and when its potential pollinators are active
as well. Plants that maximize their output during the day are primarily
pollinated by bees or butterflies, whereas those that release their
fragrance mostly at night are pollinated by moth and bats. During flower
development, newly opened and young flowers, which are not ready to
function as pollen donors, produce fewer odors and are less attractive
to pollinators than are older flowers. Once a flower has been
sufficiently pollinated, quantitative and/or qualitative changes to the floral bouquets
lead to a lower attractiveness of these flowers and help to direct
pollinators to unpollinated flowers instead, thereby maximizing the
reproductive success of the plant.
Flowering
plants produce volatile chemicals in flowers which evaporate into the
air and produce their fragrances (pleasant or sometimes unpleasant -- at
least to humans). Presumably, these specific flower fragrances attract
pollinating insects, but this is not necessarily so, since we don't know
whether insects "smell" the same way humans do.
But
indeed, gardening is a rewarding experience. Not for one reason, but
for numerous reasons. One of the most apparent rewards is a beautiful
display of flowers. Flowers have evolved into specialized pollination
machines. Some cross-pollinated plants are anemopholous, or
wind-pollinated. These plants tend to have inconspicuous flowers and
produce a lot of pollen, because wind currents cannot selectively
identify which plants are receptive to specific pollen. On the other
hand, flowers pollinated by insects (entomophilous flowers) often
advertise themselves. One way to advertise is by colors. Another
interesting way to advertise is by flower fragrances.
Whenever we pass thorough garden during the spring season, the fragrance of flowers
enchants us. Nature has endowed flowers with beauty, attractive colors,
nectar and fragrance. Insects and flies get attracted to flowers and
sit on them, and when they fly off, they carry with them the pollen
grains to the flowers. This dispersing of pollen grains helps in cross
pollination of flowers, as a result of which, seeds are produced. In
this way, plants and trees multiply on their own.
Fragrance
of flowers attract insects which help in pollination. Different flowers
contain different oils, which give them a specific fragrance. As these
oils gradually keep on evaporating, the fragrance of the flowers spreads
in the air. In fact, perfumes are prepared form the oils extracted from
these flowers. There are various processes of making perfumes. In one
process, flowers are kept in a pot through which steam is passed. The
outgoing steam, takes out the oil, which is then passed through water.
The oil brought out by the steam starts floating on water. This is then
separated. There are other methods too.
France
produces the maximum amount of perfumes. It has been found that one
ounce of rose perfume is extracted from 110 of rose flowers. Flowers
like rose, Pandarus, lavender, jasmine, etc., are generally used for making perfumes.
Flowers
of many plant species produce a scent. This scent is typically a
complex mixture of low molecular weight compounds emitted by flowers
into the atmosphere and its structure, color and odor are critical
factors in attracting pollinators. Although flowers can be identical in
their color or shape, there are no two floral scents that are exactly
the same because of the large diversity of volatile compounds and their
relative abundances and interactions. Thus, scent is a signal that
directs pollinators to a particular flower whose nectar and/or pollen is
the reward. Volatiles emitted from flowers function as both long- and
short-distance attractants and play a prominent role in the localization
and selection of flowers by insects, especially moth-pollinated
flowers, which are detected and visited at night. Species pollinated by
bees and flies have sweet scents, whereas those pollinated by beetles
have strong musty, spicy, or fruity odors.
To
date, little is known about how insects respond to individual
components found within floral scents, but it is clear that they are
capable of distinguishing among complex scent mixtures. In addition to
attracting insects to flowers and guiding them to food resources within
the flower, floral volatiles are essential in allowing insects to
discriminate among plant species and even among individual flowers of a
single species. For example, closely related plant species that rely on
different types of insects for pollination produce different odors,
reflecting the olfactory sensitivities or preferences of the
pollinators. By providing species-specific signals, flower fragrances
facilitate an insect's ability to learn particular food sources, thereby
increasing its foraging efficiency. At the same time, successful pollen
transfer (and thus, sexual reproduction) is ensured, which is
beneficial to plants.
Plants
tend to have their scent output at maximal levels only when the flowers
are ready for pollination and when its potential pollinators are active
as well. Plants that maximize their output during the day are primarily
pollinated by bees or butterflies, whereas those that release their
fragrance mostly at night are pollinated by moth and bats. During flower
development, newly opened and young flowers, which are not ready to
function as pollen donors, produce fewer odors and are less attractive
to pollinators than are older flowers. Once a flower has been
sufficiently pollinated, quantitative and/or qualitative changes to the floral bouquets
lead to a lower attractiveness of these flowers and help to direct
pollinators to unpollinated flowers instead, thereby maximizing the
reproductive success of the plant.
Flowering
plants produce volatile chemicals in flowers which evaporate into the
air and produce their fragrances (pleasant or sometimes unpleasant -- at
least to humans). Presumably, these specific flower fragrances attract
pollinating insects, but this is not necessarily so, since we don't know
whether insects "smell" the same way humans do.
But
indeed, gardening is a rewarding experience. Not for one reason, but
for numerous reasons. One of the most apparent rewards is a beautiful
display of flowers. Flowers have evolved into specialized pollination
machines. Some cross-pollinated plants are anemopholous, or
wind-pollinated. These plants tend to have inconspicuous flowers and
produce a lot of pollen, because wind currents cannot selectively
identify which plants are receptive to specific pollen. On the other
hand, flowers pollinated by insects (entomophilous flowers) often
advertise themselves. One way to advertise is by colors. Another
interesting way to advertise is by flower fragrances.
