Aquatic plant Totally Explained

Everything about Aquatic Plant totally explained

Aquatic plants — also called hydrophytic plants or hydrophytes — are plants that have adapted to living in or on aquatic environments. Because living on or under water surface requires numerous special adaptations, aquatic plants can only grow in water or permanently saturated soil. Aquatic vascular plants can be ferns or angiosperms (from both monocot and dicot families). Seaweeds are not vascular plants but multicellular marine algae, and therefore not typically included in the . As opposed to plants types such as mesophytes and xerophytes, hydrophytes don't have a problem in retaining water due to the abundance of water in its environment. This means the plant has less need to regulate transpiration (indeed, the regulation of transpiration would require more energy than the possible benefits incurred.)
Hydrophytes share several survival characteristics:

A thin cuticle. Cuticles primarily prevent water loss, thus most hydrophytes have no need for cuticles.
Stomata that are open most of time: so water is (abundant). This means that guard cells on the stomata are generally inactive.
An increased number of stomata, that can be on either side of leaves.
A less rigid structure: water pressure supports them.
Large flat leaves on surface plants for flotation.
Air sacs for flotation.
Smaller roots: water can diffuse directly into leaves.
Feathery roots: no need to support the plant.
Specialized roots designed to take in oxygen.

For example, some species of buttercup (genus Ranunculus) float slightly submerged in water; only the flowers extend above the water. Their leaves and roots are long and thin and almost hair-like; this helps spread the mass of the plant over a wide area, making it more buoyant. Long roots and thin leaves also provide a greater surface area for uptake of mineral solutes and oxygen.
   Wide flat leaves in water lilies (family Nymphaeaceae) help distribute weight over a large area, thus helping them float near surface.
   Many fish keepers keep aquatic plants in their tanks to control phytoplankton and moss by removing metabolites.
   Many species of aquatic plant are invasive species in different parts of the world. Aquatic plants make particularly good weeds because they reproduce vegetatively from fragments.

Adaptations

Free Plants: In a pond community, they receive more sunlight than submerged plants. But they also have to compete with one another for sunlight

Submerged Plants: Submerged leaves receive low levels of sunlight because light energy diminishes while passing through a water column.
All floating Plants

Have either air spaces trapped in their roots or large air spaces (aerenchyma) to help them float to obtain sunlight

Have hair on their leaves to trap air

Structural Adaptation
Duckweed, Water Cabbage

Chloroplast found on the top surface of the leaves

Upper Surface has a thick, waxy cuticle to repel water and help to keep the stomata open and clear

Structural Adaptation
Water Lily

Structural Material to Reach higher points and receive more sunlight

Structural Adaptation
Floating heart, Water Lily, Yellow pond-lily, water-shield

Leaves tend to be broader without major lobbing, remain flat on water surface, maximize surface area and make use of full sunlight, chloroplasts found on the top of leaves

Structural/ Behavioral Adaptation
Most Partially-Submerged Plants

Air spaces within the tissues to keep it buoyant so that its leaves can reach the top of the pond, maximizing the amount of sunlight received

Structural Adaptation
Dissected: Parrots Feather, Horn wort Thread-like: ditch-grass, quill wort

Highly dissected/ divided leaves or thread-like ones, Allows for a bigger surface area (surface to volume – S/V)

Structural Adaptation
Hydrilla

Elongates Rapidly to reach water surface and branches out at water surface, More light can be obtained at water surface

Structural/ Behavioral Adaptation
Human nutrition
Many aquatic plants are, or have been, used by humans as a food source. Note that especially in (South-east) Asia edible but uncooked hydrophytes are implicated in the transmission of fasciolopsiasis. See also Fasciola hepatica.

Wild rice (Zizania)

Water caltrop (Trapa natans)

Chinese water chestnut (Eleocharis dulcis)

Indian Lotus (Nelumbo nucifera)

Water spinach (Ipomoea aquatica)

Watercress (Rorippa nasturtium-aquaticum)

Watermimose, Water mimosa ? (Neptunia natans)

Taro (Colocasia esculenta)

Rice (Oryza) is originally not an aquatic plant.

Bullrush, Cattail, (Typha)

Water-pepper (Polygonum hydropiper)

Wasabi (Wasabia japonica)

kjosco? see also Fascioliasis

totora, (Scirpus californicus)?
Animal nutrition
Some examples of aquatic plants

Water hyacinth (Eichhornia)

Duckweed: Lemna, Spirodela and Wolffia

Trichanthera gigantea
Some examples of aquatic plants

Utricularia (from Latin, utriculus, a little bag or bottle) is a genus of slender aquatic plants, the leaves of which are furnished with floating bladders. They are called bladderworts.

Water lettuce
Notes and references

Cook, C.D.K. (ed). 1974. Water Plants of the World. Dr W Junk Publishers, The Hague. ISBN 90-6193-024-3Further Information
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