Botanik (Fach) / Zelle (Lektion)
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Zelle
Diese Lektion wurde von lina2407 erstellt.
- Incrustations embedded in between cellulose fibres like lignin ->lignification, especially (not only) in wood or tannins ->resistance against microorganisms, especially (not only) in bark
- Akkrusts piled onto the cellulose layer like cutin ->inside the cuticle (skin layer), waterproof waxes -> in/on cuticle, waterproof or suberin (also as incrustation) ->in cork, waterproof
- Lignin = highly complex and variable biopolymer Lignin-incrustation is called lignification of the cell wall -lignin fills the space between cellulose fibres -strengthens the cell wall, makes it rather water-impermeable and is also very hard to degrade for micro-organisms
- Tannins -simple to build -soluble in water (can therefor be extracted from plants) -for defence, mostly in dermal skin tissue and fruits -formerly also used to tan leather -in food tannins react antimicrobial and antioxidant
- Akkrusts like cutin, suberin or waxes -differently linked fatty acids, hydrophobic -waxes are crystalline -main function: avoid unnecesarry water loss, which was essential for the evolution of higher plants on land -blueish layer on fruits such as plums are wax layers and can be rubbed off