Qhov Tseem Ceeb Qhov txawv - Dedifferentiation vs Redifferentiation
Hauv cov nroj tsuag, kev sib txawv yog cov txheej txheem uas cov hlwb tau los ntawm cov hauv paus apical thiab tua-apical meristems thiab cambium sib txawv thiab paub tab ua haujlwm tshwj xeeb. Thaum sib txawv, cov nroj tsuag nyob hauv hlwb poob lub peev xwm ntawm kev faib. Txawm li cas los xij, nyob rau hauv qee qhov xwm txheej, qhov peev xwm ntawm kev faib ntxiv no tuaj yeem rov qab tau. Cov txheej txheem uas cov hlwb paub tab thim rov qab lawv lub xeev ntawm kev sib txawv thiab tau txais pluripotentiality yog hu ua dedifferentiation. Cov txheej txheem uas cov hlwb dedifferentiated poob lub zog ntawm kev faib dua thiab ua tshwj xeeb los ua haujlwm los ntawm kev hloov mus rau hauv ib feem ntawm cov ntaub so ntswg mus tas li hu ua redifferentiation. Qhov no yog qhov txawv ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov sib txawv.
Dab tsi yog qhov txawv?
Cov noob qoob loo yog muab los ntawm meristems ntawm tua apex, cag apex, thiab cambium los ntawm cov txheej txheem hu ua kev sib txawv uas cov hlwb tau sib txawv rau hauv cov qauv sib txawv txhawm rau ua haujlwm sib txawv hauv cov nroj tsuag lub cev. Cov kev hloov pauv loj tshwm sim nyob rau hauv cov nroj tsuag cell phab ntsa thiab cov protoplasm thaum lub sij hawm tus txheej txheem no. Tracheary ntsiab ntawm xylem ntawm vascular nroj tsuag undergo kev sib txawv. Cov hlwb plam cov ntsiab lus ntawm nws cov protoplasm, thiab cov phab ntsa cellulose tau lignified mus rau hauv cov phab ntsa ntawm tes, uas ua rau nws elasticity thiab ua rau cov phab ntsa ntawm tes tiv taus huab cua siab thaum lub sij hawm kev thauj mus los ntawm cov dej mus ntev.
Differentiation yog dab tsi?
Raws li qee yam xwm txheej, cov nroj tsuag cov hlwb uas twb tau sib txawv thiab tsis muaj peev xwm ntawm kev faib ntxiv rov qab muaj peev xwm ntawm kev faib thiab sib txawv. Cov txheej txheem no hu ua dedifferentiation. Lub siab sib txawv parenchyma hlwb raug dedifferentiation, uas ua rau tsim ntawm cork cambium thiab inter-fascicular cambium. Ib cov ntaub so ntswg dedifferentiated muaj peev xwm ua raws li meristem uas tuaj yeem ua rau muaj ntau lub hlwb. Lub peev xwm ntawm cov hlwb rau kev sib txawv ntxiv yog nyob ntawm qhov sib txawv xws li kev hloov caj ces thiab epigenetic variations. Lub tswv yim no yog siv rau hauv cov nroj tsuag kab lis kev cai los tsim cov callus.
Dab tsi yog Redifferentiation?
Thaum cov hlwb tshiab tsim los ntawm cov ntaub so ntswg dedifferentiated uas ua raws li meristems, cov hlwb poob lawv lub peev xwm rau kev faib thiab sib txawv. Thaum kawg, lawv tau paub tab kom ua tiav cov haujlwm tshwj xeeb ntawm cov nroj tsuag lub cev. Secondary xylem thiab theem nrab phloem yog cov piv txwv zoo tshaj plaws los piav txog cov txheej txheem ntawm kev hloov pauv. Dedifferentiated vascular cambium faib ntxiv kom nce mus rau theem nrab xylem hauv sab hauv thiab theem nrab phloem sab nraud. Secondary phloem thiab xylem hlwb poob lawv lub peev xwm rau kev faib ntxiv; Hloov chaw, lawv dhau los ua neeg paub tab kom ua tiav cov haujlwm tshwj xeeb ntawm cov nroj tsuag lub cev, uas suav nrog kev thauj khoom noj thiab dej, feem. Phelloderm yog ib txheej ntawm cov ntaub so ntswg uas tsim los ntawm dedifferentiated cork cambium. Zoo ib yam li lwm yam xylem thiab phloem, phelloderm cov hlwb poob lawv lub peev xwm rau kev sib txawv ntxiv tab sis ua kom paub tab kom ua tau haujlwm tshwj xeeb xws li kev txwv tsis pub lub cev qhuav dej thiab tiv thaiv kev nkag mus ntawm cov kab mob hauv lub cev vim kev puas tsuaj ntawm epidermis.
Daim duab 01: Kev sib txawv thiab Kev Hloov Kho Dua
Qhov txawv ntawm Dedifferentiation thiab Redifferentiation yog dab tsi?
Dedifferentiation vs Redifferentiation |
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| Dedifferentiation yog cov txheej txheem uas cov hlwb paub tab thim rov qab lawv lub xeev ntawm kev sib txawv thiab tau txais pluripotentiality. | Redifferentiation yog txheej txheem uas cov hlwb dedifferentiated poob lub zog ntawm kev faib thiab ua tshwj xeeb los ua haujlwm los ntawm kev hloov mus rau ib feem ntawm cov ntaub so ntswg mus tas li. |
| Cells rov muaj peev xwm ntawm kev faib ntxiv los ntawm kev sib cais. | Muaj peev xwm rau kev sib txawv ntxiv yog poob rau hauv cov hlwb tshiab vim kev hloov pauv. |
| New Cells | |
| Cov hlwb tshiab tsim los ntawm kev ua txhaum cai ua meristems rau kev sib txawv ntxiv. | Redifferentiated cells ua rau cov txheej txheem thib ob uas ua tiav cov haujlwm tseem ceeb. |
| Examples | |
| Cork cambium thiab inter-fascicular cambium yog cov piv txwv ntawm cov ntaub so ntswg dedifferentiated. | Secondary xylem, secondary phloem thiab phelloderm cov ntaub so ntswg yog cov piv txwv rau cov ntaub so ntswg redifferentiated. |
Summary – Dedifferentiation vs Redifferentiation
Cov noob qes tau los ntawm meristems xws li hauv paus apex, tua apex, thiab cambium tau txais kev sib txawv. Los ntawm kev sib txawv, lawv hloov mus rau hauv cov qauv uas ua haujlwm tshwj xeeb ntawm cov nroj tsuag lub cev. Thaum sib txawv, cov hlwb no poob lub peev xwm los faib ntxiv. Dedifferentiation yog ib qho txheej txheem uas tshwm sim nyob rau hauv qee qhov xwm txheej uas cov nroj tsuag cov hlwb uas twb tau sib txawv lawm tau txais lawv cov peev xwm sib txawv. Thaum cov ntaub so ntswg dedifferentiated tsim cov hlwb tshiab, cov hlwb tsim tawm poob lawv lub peev xwm rau kev sib txawv ntxiv tab sis paub tab kom ua tau haujlwm tshwj xeeb. Cov txheej txheem no hu ua redifferentiation. Qhov no yog qhov txawv ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov sib txawv.
Download PDF Version of Dedifferentiation vs Redifferentiation
Koj tuaj yeem rub tawm PDF version ntawm kab lus no thiab siv nws rau offline hom phiaj raws li daim ntawv ceeb toom. Thov download PDF version ntawm no Qhov txawv ntawm Dedifferentiation thiab Redifferentiation.
