Guttation

Guttation

Guttation is the appearance of drops of xylem sap on the tips or edges of leaves of some vascular plants, such as grasses.

At night, transpiration usually does not occur because most plants have their stomata closed. When there is a high soil moisture level, water will enter plant roots, because the water potential of the roots is lower than in the soil solution. The water will accumulate in the plant creating a slight root pressure. The root pressure forces some water to exude through special leaf tip or edge structures, hydathodes, forming drops. Root pressure provides the impetus for this flow, rather than transpirational pull.

Guttation fluid may contain a variety of organic compounds, mainly sugars, and mineral nutrients, and potassium. [cite journal | last = Goatley | first = James L. | authorlink = | coauthors = Lewis, Ralph W. | title = Composition of Guttation Fluid from Rye, Wheat, and Barley Seedlings | journal = Plant Physiology | volume = 41 | issue = 3 | pages = 373–375 | publisher = | date = March 1966 | url = http://www.pubmedcentral.gov/articlerender.fcgi?tool=pmcentrez&artid=1086351 | doi = | id = | accessdate = 2006-10-31 | pmid = 16656266] 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, but is the best way to restore soil fertility. [ [http://www.improve-your-garden-soil.com/fertilizer-burn.html Avoiding Fertilizer Burn ] ]

Guttation is not to be confused with dew, which condenses from the atmosphere onto the plant surface.

ee also

*Soil plant atmosphere continuum

References


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Look at other dictionaries:

  • Guttation — an Erdbeerblättern …   Deutsch Wikipedia

  • Guttation — sur une feuille de fraisier La guttation (du latin gutta signifiant goutte) est un processus biologique caractérisé par l apparition de goutellettes d eau, au petit matin, aux extrémités ou aux bords des feuilles chez les plantes vasculaires et… …   Wikipédia en Français

  • guttation — ● guttation nom féminin (de goutter, d après latin gutta, goutte) Perte de liquide par les plantes, au moyen d organes épidermiques appelés « hydatodes » ou stomates aquifères. (Ce phénomène apparaît surtout lorsque la transpiration est diminuée… …   Encyclopédie Universelle

  • Guttation — Guttation, Ausscheidung flüssigen Wassers in Tropfenform bei Pflanzen zur Aufrechterhaltung von Wasserstrom und Nährsalztransport in wasserdampfgesättigter Atmosphäre, in der Transpiration nicht mehr stattfinden kann; findet man z.B. bei… …   Deutsch wörterbuch der biologie

  • Guttation — gutacija statusas T sritis ekologija ir aplinkotyra apibrėžtis Drėgname ore vykstantis vandens sunkimasis iš augalų lapų per pakraščiuose esančias angeles. Priežastis – augalo šaknys įsiurbia iš dirvožemio daugiau vandens, negu lapai tuo pačiu… …   Ekologijos terminų aiškinamasis žodynas

  • guttation — gutacija statusas T sritis ekologija ir aplinkotyra apibrėžtis Drėgname ore vykstantis vandens sunkimasis iš augalų lapų per pakraščiuose esančias angeles. Priežastis – augalo šaknys įsiurbia iš dirvožemio daugiau vandens, negu lapai tuo pačiu… …   Ekologijos terminų aiškinamasis žodynas

  • Guttation — Gut|ta|ti|on 〈f. 20; bei Pflanzen〉 tropfenförmige Wasserausscheidung [<lat. gutta „Tropfen“] * * * Guttation   [zu lateinisch gutta »Tropfen«] die, / en, aktive, unter Energieaufwand erfolgende Ausscheidung verdünnter, wässriger Lösungen in… …   Universal-Lexikon

  • guttation — noun Etymology: Latin gutta drop Date: circa 1889 the exudation of liquid water from the uninjured surface of a plant leaf …   New Collegiate Dictionary

  • guttation — /gu tay sheuhn/, n. Bot. a process in which water in liquid form is given off by plants. [1885 90; < G; see GUTTA, ATION] * * * …   Universalium

  • guttation — noun The exudation of drops of water from the leaves of some vascular plants as a result of root pressure …   Wiktionary

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