Qhov sib txawv tseem ceeb ntawm sporopollenin thiab cuticle yog tias sporopollenin yog lipid thiab phenolic raws li polymer tam sim no nyob rau hauv cov tawv tawv sab nrauv ntawm cov nroj tsuag spores thiab paj ntoos nplej ntawm cov nroj tsuag hauv av, thaum cuticle yog ib qho txuas ntxiv lipophilic polymer uas yog txheej rau saum huab cua. nto ntawm cov nroj tsuag.
Nroj tsuag muaj peb qhov loj tshaj ntawm cov kab mob hydrophobic barriers. Lawv yog cuticle, sporopollenin, thiab suberin. Cov kab mob extracellular no feem ntau muaj lipids. Lub luag haujlwm tseem ceeb ntawm cov khaubncaws sab nraud povtseg yog tiv thaiv cov nroj tsuag tiv thaiv ntau yam kev ntxhov siab ib puag ncig xws li salinity, dej tsis txaus, pathogen nres thiab qhov txhab.
Sporopollenin yog dab tsi?
Sporopollenin yog ib qho lipid thiab phenolic raws li polymer tam sim no nyob rau hauv cov tawv tawv phab ntsa ntawm cov nroj tsuag spores thiab paj ntoos nplej ntawm cov nroj tsuag hauv av. Nws yog ib qho ntawm cov chemically inert biological polymers. Nws kuj yog tshuaj zoo ruaj khov. Nws yog zoo khaws cia nyob rau hauv cov av thiab sediments. Qee zaum, sporopollenin kuj pom nyob rau hauv cov phab ntsa ntawm tes ntawm ntsuab alga. Feem ntau, cov spores tau tawg mus rau ntau txoj hauv kev, xws li cua, dej, thiab tsiaj txhu. Yog tias cov xwm txheej tsim nyog, cov phab ntsa ntawm paj ntoos nplej thiab cov spores uas impregnate sporopollenin tuaj yeem nyob hauv cov pob txha rau ntau tshaj li ib puas lab xyoo. Qhov no yog vim sporopollenin resistant rau tshuaj degradation los ntawm cov organic thiab inorganic tshuaj.
Daim duab 01: paj ntoos nplej
Cov tswv yim tsom xam tau qhia tias sporopollenin yog ib qho nyuaj biopolymer. Nws feem ntau muaj cov kab sib txuas ntev fatty acids, phenylpropanoids, phenolics thiab kab ntawm carotenoids nyob rau hauv ib qho random copolymer. Nws ntseeg hais tias sporopollenin tsav los ntawm ob peb precursors uas yog cross-linked los tsim ib tug nruj qauv. Tsis tas li ntawd, tapetal cells tau koom nrog hauv biosynthesis ntawm sporopollenin. Cov hlwb no muaj cov txheej txheem zais cia uas muaj lipophilic globules. Ntxiv mus, lub luag haujlwm tseem ceeb ntawm sporopollenin yog los tiv thaiv paj ntoos nplej los ntawm kev puas tsuaj sab nraud xws li los nag thiab kub.
Cuticle yog dab tsi?
Ib lub cuticle yog ib txheej lipophilic txuas ntxiv uas yog txheej saum npoo av ntawm cov nroj tsuag hauv av. Cov nroj tsuag cuticle yog kev tiv thaiv npog. Nws npog lub epidermis ntawm nplooj, cov tub ntxhais hluas tua, thiab lwm yam aerial cog kab mob uas tsis muaj periderm. Cog cuticle muaj lipids thiab hydrocarbon polymers impregnated nrog ciab. Lub cuticle yog chemically tsim los ntawm waxes embedded nyob rau hauv thiab overlaying ib tug matrix ntawm cutin. Cov waxes feem ntau yog cov derivatives ntawm cov saw ntev fatty acids (C20-C34), uas muaj xws li aldehydes, alkanes, thawj cawv, cawv thib ob, ketones, thiab esters. Cutin yog ib qho esterified polymer ntawm C16 thiab C18 omega thiab mid-chain hydroxy fatty acid uas yog esterified rau glycerol skeleton.
Daim duab 02: Cuticle
Nws feem ntau yog tsim los ntawm cov hlwb epidermal. Cuticles feem ntau tshwm sim nyob rau sab nrauv ntawm lub hauv nruab nrog cev ntawm tag nrho cov nroj tsuag vascular av. Tab sis qee zaum, nws kuj tseem muaj nyob rau hauv tiam sporophyte ntawm hornworts thiab ob qho tib si sporophyte thiab gametophyte tiam ntawm mosses. Lub cuticle tuaj yeem raug cais los ntawm kev kho cov ntaub so ntswg nrog cov enzymes xws li pectinase thiab cellulase.
Dab tsi yog qhov zoo sib xws ntawm Sporopollenin thiab Cuticle?
- Sporopollenin thiab cuticle yog ob qhov loj tshaj ntawm cov cellular hydrophobic barriers nyob rau hauv cov av cog.
- Ob leeg yog cov biopolymers complex.
- Cov txheej no muaj lipids.
- Cov txheej no tiv thaiv cov nroj tsuag tiv thaiv ntau yam kev ntxhov siab ib puag ncig xws li salinity, dej tsis txaus, kab mob tawm tsam thiab mob.
Qhov txawv ntawm Sporopollenin thiab Cuticle yog dab tsi?
Sporopollenin yog ib qho lipid thiab phenolic raws li polymer tam sim no nyob rau hauv tawv txheej phab ntsa ntawm cov nroj tsuag spores thiab paj ntoos nplej ntawm cov nroj tsuag hauv av, thaum lub cuticle yog ib tug nruam lipophilic polymer uas yog txheej saum npoo av ntawm cov nroj tsuag hauv av. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm sporopollenin thiab cuticle. Tsis tas li ntawd, sporopollenin feem ntau muaj cov roj ntsha ntev ntev, phenylpropanoids, phenolics, thiab cov kab mob carotenoids nyob rau hauv ib qho random copolymer. Lub caij no, lub cuticle feem ntau muaj cov waxes embedded nyob rau hauv thiab overlaying ib tug matrix ntawm cutin esterified polymer.
Cov infographic hauv qab no teev qhov sib txawv ntawm sporopollenin thiab cuticle hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Sporopollenin vs Cuticle
Nroj tsuag muaj peb qhov tseem ceeb ntawm cov kab mob hydrophobic los yog txheej xws li cuticle, sporopollenin, thiab suberin rau kev tiv thaiv. Sporopollenin yog ib qho lipid thiab phenolic raws li polymer tam sim no nyob rau hauv tawv txheej phab ntsa ntawm cov nroj tsuag spores thiab paj ntoos nplej ntawm cov nroj tsuag hauv av, thaum lub cuticle yog ib tug nruam lipophilic polymer uas yog txheej saum npoo av ntawm cov nroj tsuag hauv av. Yog li, qhov no yog cov ntsiab lus ntawm qhov sib txawv ntawm sporopollenin thiab cuticle.
