Leaf of a grapevine showing guttatio
Numéro d’image : 11632150
| A leaf of a grapevine (Vitis vinifera ) growing in a glasshouse,photographed just after dawn in early summer,UK.Plants obtain dissolved soil nutrients by absorbing them through their roots. During daylight,the nutrients are drawn upwards within the xylem cells of the plant,as water evaporates from the leaves via open stomatal pores on their surface (transpiration). At night,roots continue to absorb mineral ions,but the stomatal pores are closed. The ions within the xylem fluid raise its osmotic pressure,( so-called root pressure) and water is drawn into the xylem from surrounding cells in the plant by osmosis. The excess fluid escapes through surface cells known as hydathodes,causing droplets to form at the leaf edge. On still warm mornings,guttation is the cause of "dew" on plants growing n the open; on cool mornings,dew is caused by condensation of water from the air | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
| Taille de l’image : | 3413 px × 5121 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
Prix pour cette image À partir de 45 €
Produit vendu
(Calendrier, Carte postale, Carte de vœux, Impression sur textile, Packaging etc)
À partir de 45 €
Usage commercial
(Affichage, Annonce presse, Annonce TV, Carte, Digital - hors rés. sociaux, Digital - rés. sociaux etc)
À partir de 45 €
Éditorial
(Digital, Journal, Livre, Livre pratique, Magazine, Télévision etc)
À partir de 60 €
Usage non-commercial
(Digital - hors rés. sociaux, Digital - rés. sociaux etc)
À partir de 120 €