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STOMATAL REGULATION [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2004-05-20

English

Subject field(s)
  • Plant Biology
DEF

A minute pore in the epidermis of leaves or stems which functions in gaseous exchange between a plant and its external environment.

CONT

Epidermis of leaves ... contains numerous guard cells [placed pairwise] the open space between two paired guard cells is a stoma.

OBS

Stomas are bordered by guard cells which function in the regulation of the size of the opening : stomas plus guard cells are referred to as the stomatal apparatus.

OBS

stoma [designates usually] the opening together with its associated guard cells and accessory cells.

OBS

stoma: The plural form is stomata or stomas.

Key term(s)
  • stomata
  • stomatal opening

French

Domaine(s)
  • Biologie végétale
CONT

À l'échelle microscopique, on trouve un autre exemple de courant induit chez les végétaux qui réalisent des échanges gazeux par l'intermédiaire des stomates ou pores de la feuille.

CONT

Les stomates [...] se trouvent sur la face inférieure des feuilles [et] sont régulièrement répartis dans l'épiderme.

Spanish

Campo(s) temático(s)
  • Biología vegetal
DEF

Poro de la superficie epidérmica de las hojas que comunica los tejidos y espacios intercelulares de éstas con el exterior.

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Record 2 2003-06-13

English

Subject field(s)
  • Plant Biology
DEF

Stomatal movements results from changes in turgor pressure within the guard cells.

CONT

Stomatal regulation... The major solute responsible for this gradient is potassium(K+) ;higher K+ and Cl-;... Opening occurs when solutes are actively accumulated [water rushes in due to osmosis], in these [guard] cells. Stomatal closure is brought about by the reverse process(a declining guard cell solute) ;water moves out of the guard cells lowering turgor pressure.

OBS

Guard Cell: Pairs of specialized epidermal cells surrounding a pore, or stoma ...

French

Domaine(s)
  • Biologie végétale
DEF

Intervention du calcium, des protéines kinases et des canaux ioniques des cellules de garde des plantes.

CONT

L'ostiole du stomate s'ouvre ou se ferme selon les conditions du milieu extérieur, (lumière, température, humidité, teneur en gaz carbonique) et l'état interne, notamment hydrique, de la plante. Les variations de cette ouverture ou régulation stomatique, règlent le débit des gaz absorbés ou émis par la feuille dans les processus de transpiration (vapeur d'eau), de photosynthèse ou de respiration (gaz carbonique et oxygène).

Spanish

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