Anisha Riggs
Flowers are not just beautiful to look at and smell; they are also vital to plant reproduction. Flowers attract pollinators with their colours, shapes, sizes, scents, and flowering times. Flowers with sweet scents are usually pollinated by bees and flies, while those with musty, spicy, or fruity scents attract beetles. Brightly coloured flowers attract bees and other insects, while nocturnal flowers that are white or very pale attract bats and moths. The colour of a flower is determined by its hereditary genome, specifically the pigments it contains. Flavonoids are the most important plant pigments for flower coloration, with anthocyanins creating red, purple, blue, and pink colours.
| Characteristics | Values |
|---|---|
| Color | Determined by a flower's hereditary genome and pigments. Flavonoids are the most important plant pigments for flower coloration. |
| Fragrance | Attracts pollinators and humans. Light-colored flowers have stronger scents and emit more diverse scent compounds than dark and bright flowers. |
| Attractiveness | Showy petals and sepals, nectar guides, shape, size, and color attract pollinators. |
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What You'll Learn
- Flowers use colour and fragrance to attract pollinators such as bees, flies, beetles, and butterflies
- The colour of a flower is determined by its hereditary genome
- Flowers with lighter colours tend to have stronger scents and emit more diverse scent compounds
- Flowers also use visual cues such as showy petals, nectar guides, shape, size, and colour patterns to attract pollinators
- Floral scents are derived from essential oils, which are widely used in industries such as cosmetics and medicine
Flowers use colour and fragrance to attract pollinators such as bees, flies, beetles, and butterflies
Flowers are a treat for the senses, but they use their colour and fragrance for more than just our enjoyment. Flowers rely on their bright petals and sweet scents to attract pollinators such as bees, flies, beetles, and butterflies.
Flowers use colour as a visual cue to attract pollinators. The colour of a flower is determined by its hereditary genome, which determines what pigments a flower will have. Flavonoids are the most important plant pigments for flower colouration. For example, anthocyanins are compounds that create colours like red, purple, blue and pink, and are compounds found in the flavonoid class. Flowers with blue petals, for instance, attract bees, who view these flowers in the ultraviolet range. Similarly, flowers with red or yellow petals tend to attract butterflies and hummingbirds.
Flowers also use their fragrance to attract pollinators. Specific smells attract specific pollinators. Bees and flies are drawn to flowers with sweet scents, while beetles are attracted to flowers with spicy or musty scents. Insects can distinguish between fragrances and choose their favourite scent, as well as the most potent flower with that scent.
Flowers also use their shape and size to provide visual clues and a structure that allows a specific, co-evolved pollinator to contact the flower's anthers and stigmas. For example, the Turk's cap lily is uniquely shaped to be accessed and pollinated by butterflies. Beetle-pollinated flowers tend to be larger and more open, providing an easy landing pad since beetles are not as agile in flight as other flying insects.
Some flowers also feature nectar guides that are specific to particular pollinators. For example, the trout lily has showy sepals and petals that are technically called tepals, which attract bumblebees.
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The colour of a flower is determined by its hereditary genome
Genes play a crucial role in determining flower colour. Two main groups of genes control flower colour. One group codes for the protein machinery required to make pigment molecules, while the other group codes for regulatory proteins. These regulatory proteins, in turn, control the location, type, and amount of pigment-producing machinery made. Enzymes, which are types of proteins, work together to build pigment molecules.
In some cases, a single gene can have a significant impact on flower colour. For instance, the SINGLE FLOWER TRUSS (SFT) gene in tomato plants influences the production of florigen protein, a hormone that signals the plant to make flowers. The level of florigen protein produced affects the number of flowers the plant generates.
The concentration and type of pigments in a flower's petals can also determine which pollinators are attracted to it. For example, the red flowers of M. cardinalis, with their high levels of carotenoids and anthocyanins, attract more pollinators than the pink flowers of M. lewisii, which have lower levels of these pigments.
Additionally, some flowers have evolved unique shapes that seem to defy pollination. For example, the bottle gentian has a structure that forces a bumblebee to enter the flower completely before turning around and exiting in the same way.
Beyond their visual cues, flowers also use attractive smells to entice pollinators. Fragrances, along with colours, encourage plant pollination, ensuring the continuation of bright and vibrant flowers.
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Flowers with lighter colours tend to have stronger scents and emit more diverse scent compounds
Flowers are not just beautiful to look at, but they also have intricate internal systems that create a unique experience for every plant, pollinator, and passerby. Flowers use both scent and colour to attract insects, which then acquire pollen during their floral visits, ensuring the pollination of the plants.
The colour of a flower is determined by its hereditary genome, which dictates the pigments a flower will have, and pigments yield different colours. Flavonoids are the most important plant pigments for flower coloration. Anthocyanins, for example, are compounds that create colours like red, purple, blue, and pink, and are found in the flavonoid class.
The scent compounds of flowers are constantly changing during flowering due to GA activity, which controls flower development and creates a time gap for the biosynthesis of pigments and scent compounds. The biosynthesis of floral volatiles is more diverse and complex than that of floral pigments and involves the pleiotropy of compositions and the genetic background. Floral scents are a complex mixture of highly volatile compounds and essential oils that flowers emit into the atmosphere. These essential oils, which contain several aromatic compounds, have been found to have relaxing effects that can help lower blood pressure.
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Flowers also use visual cues such as showy petals, nectar guides, shape, size, and colour patterns to attract pollinators
Flowers use a variety of visual cues to attract pollinators. These include colourful and showy petals, sepals, and nectar guides, as well as specific shapes and sizes.
Showy petals and sepals with obvious colours and patterns attract pollinators. For example, the trout lily, a member of the lily family, has very showy sepals and petals that are technically called tepals. Similarly, the blue petals of the bird's-foot violet attract bees, which view these flowers in the ultraviolet range.
Nectar guides are patterns in flowers that direct pollinators to the nectar and pollen. They are especially important for specific pollinators. For example, the nectar guides on the Iris missouriensis direct bumblebees down between the sepal and the style arm. The South African iris Lapeirousia oreogena has six white arrow markings pointing towards the narrow entrance of the long corolla tube, which guides a long-proboscid nemestrinid fly.
The shape of flowers can also determine which pollinators they attract. For example, the bottle gentian (Gentiana andrewsii) has a shape that seems to defy pollination. A bumblebee lands on top of the flower, forcibly spreads the corolla open, enters the flower, turns around, and exits the same way. The native azalea has a unique shape that allows a ruby-throated hummingbird to sample the nectar and contact the exserted stamens and stigma.
The size of flowers can also act as a visual cue for pollinators. Larger flowers tend to be more easily seen from a distance and can provide a broad landing area for certain pollinators. For example, the American lotus has flowers up to 13 inches in diameter that are easily spotted by beetles.
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Floral scents are derived from essential oils, which are widely used in industries such as cosmetics and medicine
Flowers are not just beautiful to look at; they are also a source of essential oils that are widely used in various industries, particularly cosmetics and medicine. Floral scents are derived from these essential oils, which are extracted from different parts of the flower, including the petals, sepals, and roots.
Essential oils are volatile aroma compounds that are usually derived from plants, with flowers being a common source. These oils are not true oils in the strict sense but share characteristics such as poor solubility in water. They are often distinguished by their distinct fragrances, which are created by intricate biochemical processes within the flower. The number of known chemicals contributing to a rose's fragrance has increased significantly over the years.
Flowers use their attractive colours and scents to lure pollinators like bees, butterflies, and insects. The colour of a flower is determined by its hereditary genome, with flavonoids being the most crucial pigments. Scents, on the other hand, are produced by fragrance compounds created when nectaries secrete sugars and amino acids. These compounds are housed at the base of the male stamen in the flower.
The cosmetic industry has long recognised the benefits of floral-derived oils for skincare and beauty products. For example, chamomile, known for its calming properties, is often used in skincare to reduce redness and sensitivity and to promote skin healing. Similarly, lavender oil is prized for its antibacterial and skin-calming properties, making it ideal for treating active blockages and pimples. Marigold flowers, or calendula, produce an oil with antifungal, antimicrobial, and anti-inflammatory properties, making it a valuable ingredient in skincare and anti-inflammatory creams.
In addition to cosmetics, flower-derived oils are used in medicine to treat various ailments. For instance, water lilies, or nymphaea alba, have been used in traditional medicine for their pain-killing and healing properties. They are also used in modern skincare for their moisturising and protective effects against free radical damage. Goldenrod oil is another example of a flower-derived oil used in herbal medicine to treat urological problems.
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Frequently asked questions
A flower's colour comes from its hereditary genome, which determines the pigments a flower will have. Flavonoids are the most important plant pigments for flower coloration. Anthocyanins, for example, are compounds that create colours like red, purple, blue, and pink.
Fragrance compounds are created at the base of the male stamen in the flower in nectaries. Nectaries secrete sugars and amino acids, which form these fragrance compounds.
Flowers have different ways of attracting pollinators. Some flowers use visual cues such as showy petals and sepals, nectar guides, shape, size, and colour. Brightly coloured flowers attract bees and insects that act as pollinators. Flowers can also use their fragrance to attract pollinators.
