Nettle leaf stalk structures,LM

Numéro d’image : 11536534
Nettle leaf stalk structures,LM
Nettle leaf stalk structures. Polarised light micrograph (LM) of a nettle leaf (Urtica dioica),which has been boiled up with dilute sodium hydroxide to separate the cells,washed in water and stained with blue ink. The long tubes that carry water and minerals up the stem can be seen in blue and the lignin thickenings that strengthen the tubes show up mainly in black,in different annular (rings),spiral and scalariform ladder-like) formations. Lignin is a complex chemical compound and is hydrophobic (repelled from a mass of water). As well as providing structural support,the hydrophobicity of lignin also means that the plant's vascular tissue is able to conduct water efficiently
Licence : Droits gérés
Crédit: Science Photo Library / Wheeler, Dr. Keith
Taille de l’image : 3586 px × 4680 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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