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Guttation is the appearance of drops of xylem
Xylem

In vascular plants, xylem is one of the two types of transport tissue, phloem being the other. The word "xylem" is derived from classical Greek language ????? , "wood", and indeed the best known xylem tissue is wood, though it is found throughout the plant....
 sap on the tips or edges of leaves of some vascular plant
Vascular plant

Vascular plants are those plants that have lignin tissue for conducting water, minerals, and photosynthetic products through the plant. Vascular plants include the ferns, clubmosses, flowering plants, conifers and other gymnosperms....
s, such as grass
Grass

Grass is the common word that generally describes monocotyledonous green plants. The family Poaceae are the "true grasses" and include most plants grown as grains, for pasture, and for lawns ....
es.

At night, transpiration
Transpiration

Transpiration is the evaporation of water from the aerial parts of plants, especially leaf but also Plant stems, flowers and roots. Leaf surfaces are dotted with openings called stoma that are bordered by guard cells....
 usually does not occur because most plants have their stoma
Stoma

In botany, a stoma is a pore, found in the leaf and stem epidermis that is used forgas exchange. The pore is formed by a pair of specialized parenchyma cells known as guard cells which are responsible for regulating the size of the opening....
ta closed.






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Guttation Ne
Guttation 088 Cropped
Guttation is the appearance of drops of xylem
Xylem

In vascular plants, xylem is one of the two types of transport tissue, phloem being the other. The word "xylem" is derived from classical Greek language ????? , "wood", and indeed the best known xylem tissue is wood, though it is found throughout the plant....
 sap on the tips or edges of leaves of some vascular plant
Vascular plant

Vascular plants are those plants that have lignin tissue for conducting water, minerals, and photosynthetic products through the plant. Vascular plants include the ferns, clubmosses, flowering plants, conifers and other gymnosperms....
s, such as grass
Grass

Grass is the common word that generally describes monocotyledonous green plants. The family Poaceae are the "true grasses" and include most plants grown as grains, for pasture, and for lawns ....
es.

At night, transpiration
Transpiration

Transpiration is the evaporation of water from the aerial parts of plants, especially leaf but also Plant stems, flowers and roots. Leaf surfaces are dotted with openings called stoma that are bordered by guard cells....
 usually does not occur because most plants have their stoma
Stoma

In botany, a stoma is a pore, found in the leaf and stem epidermis that is used forgas exchange. The pore is formed by a pair of specialized parenchyma cells known as guard cells which are responsible for regulating the size of the opening....
ta closed. When there is a high soil moisture level, water will enter plant roots, because the water potential
Water potential

Water potential is the potential energy of water relative to pure free water in reference conditions. It quantifies the tendency of water to move from one area to another due to osmosis, gravity, mechanical pressure, or matrix effects including surface tension....
 of the roots is lower than in the soil solution. The water will accumulate in the plant, creating a slight root pressure
Root pressure

Root pressure: osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves.Root pressure occurs in the xylem of some vascular plants when the soil moisture level is high either at night or when transpiration is low during the day....
. The root pressure forces some water to exude through special leaf
Leaf

In botany, a leaf is an above-ground plant Organ specialized for photosynthesis. For this purpose, a leaf is typically flat and thin, to expose the cells containing chloroplast to light over a broad area, and to allow light to penetrate fully into the tissues....
 tip or edge structures, hydathode
Hydathode

A hydathode is a type of secretion Biological tissue in Leaf , usually of Angiosperms, that secretes water through pores in the Epidermis or margin of leaves, typically at the tip of a marginal tooth or serration....
s, forming drops. Root pressure provides the impetus for this flow, rather than transpirational pull
Transpirational pull

Transpirational pull is the main phenomenon driving the flow of water in the xylem tissues of large plants....
.

Guttation fluid may contain a variety of organic and inorganic compounds, mainly sugars, and mineral nutrients, and potassium. On drying, a white crust remains on the leaf surface.

If high levels of nitrogen appear in the fluid, then that is a sign of fertilizer burn. Excess nitrogen must be leached from the soil by addition of large quantities of water. This may result in water pollution
Water pollution

Water pollution is the contamination of water bodies such as lakes, rivers, oceans, and groundwater caused by human activities, which can be harmful to organisms and plants that live in these water bodies....
, but is the best way to restore soil fertility.

Guttation is not to be confused with dew
Dew

Dew is water in the form of droplets that appears on thin, exposed objects in the morning or evening. As the exposed surface cools by thermal radiation its heat, atmospheric moisture condensation at a rate greater than that at which it can evaporation, resulting in the formation of water droplets....
, which condenses from the atmosphere onto the plant surface.

See also

  • Soil plant atmosphere continuum
    Soil plant atmosphere continuum

    The Soil-Plant-Atmosphere Continuum is the pathway for water moving from soil through plants to the atmosphere.The transport of water along this pathway occurs in components, variously defined among scientific disciplines:...