lecture secondary cell wall [kompatibilitätsmodus]
Post on 23-Apr-2022
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Lecture PBPM - Secondary plant cell wall
Secondary plant cell wallSecondary plant cell wall
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Lecture PBPM - Secondary plant cell wall: topics
Topics
plant/environment interface of cutin (lipophilic biopolymer)plant/environment interface of cutin (lipophilic biopolymer)fine structure of leaf surfaces
chemical composition of cutin and waxlipid and wax biosynthesislipid and wax biosynthesis
cuticle structure
l / i i f f b i (li hili bi l )plant/environment interface of suberin (lipophilic biopolymer)chemical composition of suberin
biosynthesis of suberinoccurrence and fine structure of suberized cell walls
lignin as an aromatic biopolymer: mechanical stability of plantsg p y y plignin monomers and lignin biosynthesis
lignin polymerisationlignin structure
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lignin structurehistochemical detection of lignin
lignification and pathogen defence
Lecture PBPM - Fine structure of leaf surfaces covered by cuticles
Caltha palustris Anthemis tinctoria Viola tricolor
P th i t i id t N t i b i li d iC l h l i
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Parthenocissus tricuspidata Neoporteria brevicylindricaCaltha palustris
Lecture PBPM - Fine structure of leaf surfaces covered by waxes
Taxus baccata Hypericum buckleyiLonicera tatarica
Heliconia collinsiana Lecythis chartacea Williamodendron quadrilocelathum
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Lecture PBPM - Wax covered stomate
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Lecture PBPM - Wax mutants of Arabidosis thaliana help to identifying wax biosynthesis genes
stemwt cer7 cer 17
siliquewt cer7 cer 17
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Lecture PBPM - Cuticle of Clivia nobilis in the light microscope
cell wall staining cutin staining cell wall andcutin stainingg
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Lecture PBPM - Cuticle in the transmission electron microscope: glandular cell of Lamium
cuticle
cell wall
cellcell
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Lecture PBPM - Relative distribution of lipids in leaves
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Lecture PBPM - Proposed pathway for wax biosynthesis
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Lecture PBPM - Major constituents of cutin and wax
ω-hydroxyfatty acids h i l th fω hydroxyfatty acids
in chain-hydroxyfatty acids
chain lengths ofC16 and C18
waxes can have chain lengthsbetween C22 to C60
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Lecture PBPM - Proposed poylmer structure of cutin
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Lecture PBPM - Epidermis covered by a cuticle
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Lecture PBPM - Suberized interfaces of plants
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Lecture PBPM - Suberin and lenticells
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Lecture PBPM - Suberin biosynthesis
nH3C
C O O H
OH
n
H3COH
CR
O
C C S C oA
OH
H
CR
O
S C o A
H3CC O O H
OHn
P450?FARP450
FAE
KCS(FDH, HIC, KCS1 ?)
n
H3CC O O H
CR C C S C oA
OH H
CR
O H
C C S C o A
OH
HH
C24C22C20C18
FAD
P450
n
H3CC O O H
CR C C S C oA
HH
CR C C S C oA
O
HHP450(LCR, ATT1 ?)
HOn
C O O H
P450 ω-hydroxyacid dehydrogenase(HTH ?)
On
C O O H
ω-oxo-acid dehydrogenase
• elongation – FAE (KCS)
• functionalisation – P450
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nC O O HO
OH
Lecture PBPM - Major constituents of suberin
ω hydroxyfatty acids of various chain lengthsω-hydroxyfatty acids of various chain lengths
α,ω-diacids of various chain lengths
chain lengths can vary between C16 to C32
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Lecture PBPM - Stem periderm of Malus sylvestris
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Lecture PBPM - Belowground suberized interfaces of plants in roots
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Lecture PBPM - Suberin ultra structure of potato periderm (Solanum tuberosum)
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Lecture PBPM - Lignified cell walls of Asparagus officinalis in the light microscope
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Lecture PBPM - Histochemical detection of lignin
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Lecture PBPM - Biosynthesis of phenolics leading to lignin monomers: easy scheme
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Lecture PBPM - Biosynthesis of phenolics leading to lignin monomers: detailed scheme
p-Coumaryl alcohol
Coniferyl alcohol
Sinapyl alcohol
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Sinapyl alcohol
Lecture PBPM - Radical polymerisation of lignin
if l
peroxidase
isomeric forms the coniferyl alcohol radicalsconiferylalcohol
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Lecture PBPM - Lignin monomers and the polymer
compound
p-coumaryl alcoholconiferyl alcoholsinapyl alcohol
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Lecture PBPM - Hypothetical structure of the lignin polymer
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Lecture PBPM - Architecture of a conifer tracheid from Pseudotsuga menziesii
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Lecture PBPM -Lecture PBPM - Lignification as important defence reaction of plants towards pathogens
fungus
epidermal cell
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