Qhov sib txawv tseem ceeb ntawm abscission thiab senescence yog qhov abscission yog ib qho txheej txheem tseem ceeb uas cov nroj tsuag tuaj yeem tso lawv lub cev hauv nruab nrog cev xws li nplooj, paj, txiv hmab txiv ntoo, noob, qia, lossis lwm yam los ntawm cov niam txiv cog thaum senescence yog ib tug Cov txheej txheem kev laus hauv lub cev uas cov hlwb irreversibly nres kev faib thiab nkag mus rau hauv lub xeev ntawm kev loj hlob mus tas li raug ntes yam tsis muaj kev tuag ntawm tes.
Abscission thiab senescence yog ob txheej txheem ntawm tes. Abscission yog kev sib cais ntawm cov nroj tsuag los ntawm cov niam txiv cog. Senescence yog cov txheej txheem cellular uas cov hlwb qhia ib daim ntawv mus tas li ntawm cell cycle ntes. Abscission tshwm sim tom qab tsim ib qho chaw abscission ntawm qhov chaw ntawm kev sib cais. Senescence tshwm sim nyob rau hauv lub cev nrog rau qib kab mob. Nyob rau hauv cov nroj tsuag, abscission tso cai los ntawm senescent los yog physiologically puas nroj tsuag qhov chaw thaum senescence yog ib qho tseem ceeb kom muaj zog thiab ciaj sia taus.
Abscission yog dab tsi?
Abscission yog txheej txheem tseem ceeb tshwm sim hauv cov nroj tsuag. Nws yog txheej txheem kev sib cais ntawm tes. Qhov tseeb, nws yog ib qho kev tswj nruj ntawm cellular zuj zus. Abscission tuaj yeem txhais tau tias yog kev sib cais ntawm cov nroj tsuag xws li nplooj, paj, txiv hmab txiv ntoo, noob, qia, lossis lwm yam los ntawm cov nroj tsuag niam txiv. Abscission tshwm sim nyob rau hauv pab pawg ntawm cov hlwb ua haujlwm tshwj xeeb hu ua abscission zones. Abscission zones yog nyob rau ntawm qhov chaw tshwj xeeb ntawm lub cev detachment hauv cov nroj tsuag. Nws yog ib qho txheej txheem tseem ceeb uas cov nroj tsuag tuaj yeem tso lub cev. Abscission tso cai rau muab pov tseg ntawm senescent lossis physiologically puas lub cev.
Ntxiv mus, abscission yog xav tau rau cov noob thiab txiv hmab txiv ntoo tawg tau zoo heev. Leaf abscission yog ib qho txheej txheem thaum lub sij hawm cov nplooj qub yog los. Abscission tshwm sim nyob rau hauv cov nplooj hluas thaum lawv raug kab mob los yog kab mob. Tsis tas li ntawd, ripen txiv hmab txiv ntoo yog poob los ntawm cov nroj tsuag vim abscission. Cov tshuaj hormones xws li ethylene, auxin, thiab abscisic acid cuam tshuam abscission hauv cov nroj tsuag. Auxin yog cov tshuaj hormones tseem ceeb uas tswj cov abscission.
Daim duab 01: Abscission
Abscission muaj ntau heev hauv cov nroj tsuag qis. Txawm li cas los xij, qhov tshwm sim ntawm abscission txawv nyob rau hauv hom thiab cultivars. Yog li ntawd, manipulation ntawm abscission txheej txheem yog ib qho kev xyaum ua liaj ua teb. Hauv cov qoob loo zoo li citrus, qhov feem pua ntawm cov qoob loo poob siab yog vim abscission. Cov qoob loo qis qis feem ntau yog vim qhov abscission ntawm paj buds, paj, thiab txiv hmab txiv ntoo tsis paub qab hau.
Abscission tshwm sim ntawm peb kauj ruam tseem ceeb: resorption, tiv thaiv txheej tsim thiab detachment. Thaum lub sij hawm resorption, chlorophyll degrades thiaj li rho tawm feem ntau ntawm cov as-ham. Ib txheej ntawm cork hlwb tsim nyob rau hauv thaj tsam abscission thaum lub sij hawm thib ob. Detachment yuav siv sij hawm qhov chaw vim lub secretion ntawm cell phab ntsa enzymes los ntawm parenchyma hlwb mus rau nws tus kheej-digest lub nruab nrab lamella los yog vim imbibitions ntawm dej.
Abscission tsis txwv rau cov nroj tsuag. Abscission kuj tseem hu ua kev txhob txwm tso tawm ntawm lub cev hauv lub cev pom hauv qee yam tsiaj. Piv txwv li, tailless lizards txhob txwm tso lawv cov tails, txhawm rau kom dim ntawm tus neeg tua tsiaj.
Senescence yog dab tsi?
Senescence yog txheej txheem kev laus lom neeg. Nws yog cov txheej txheem los ntawm cov hlwb irreversibly txwv tsis pub faib thiab nkag mus rau hauv lub xeev ntawm kev loj hlob mus tas li raug ntes yam tsis muaj kev tuag ntawm tes. Yog li ntawd, nyob rau hauv cov nroj tsuag, senescence tuaj yeem suav hais tias yog theem kawg ntawm kev loj hlob. Ntau cov tshuaj hormones xws li ethylene thiab abscisic acid txhawb kev loj hlob ntawm cov nroj tsuag. Senescence tuaj yeem tshwm sim ntawm ntau theem xws li qib hauv nruab nrog cev, qib kab mob, thiab lwm yam. Nroj tsuag hloov cov as-ham los ntawm cov nplooj mus rau stems los yog cag. Yog li ntawd, senescence yog ib qho tseem ceeb rau cov nroj tsuag kom muaj zog thiab ciaj sia.
Daim duab 02: Senescence
Tsis kho DNA puas lossis lwm yam kev ntxhov siab ntawm cellular tuaj yeem ua rau cellular senescence. Qee qhov tshwj xeeb ua kom muaj kev loj hlob hauv cov hlwb. Cov hlwb qhia cov kev hloov pauv xws li kev sib xyaw ntawm cov khoom tawg, tsis ua rau cov protein thiab nucleic acid synthesis, poob ntawm cellular respiration, thiab tso tawm cov enzymes los ntawm lysosomes, thiab lwm yam.
Dab tsi zoo sib xws ntawm Abscission thiab Senescence?
- Abscission thiab senescence yog ob txheej txheem tshwm sim hauv cov nroj tsuag.
- Nroj tsuag los yog tsob ntoo qhov chaw raug abscission thiab senescence.
- Abscission tso cai rau muab pov tseg senescent lossis lub cev puas tsuaj ntawm lub cev los ntawm niam txiv cog.
- Cov tshuaj hormones txhawb nqa ob txoj haujlwm.
Qhov txawv ntawm Abscission thiab Senescence yog dab tsi?
Abscission yog lub ntuj detachment ntawm cov nroj tsuag los ntawm niam txiv cov nroj tsuag thaum senescence yog cov txheej txheem kev laus hauv cov hlwb uas tau txais kev loj hlob ruaj khov thiab lwm yam kev hloov pauv phenotypic. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm abscission thiab senescence. Abscission yog ib qho tseem ceeb vim nws tso cai rau muab pov tseg senescent los yog lub cev puas tsuaj rau hauv nruab nrog cev thiab ua tau zoo heev noob dispersal. Senescence yog qhov tseem ceeb hauv cov nroj tsuag kom muaj zog thiab muaj sia nyob.
Hauv qab infographic teev ntau qhov sib txawv ntawm abscission thiab senescence.
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Qhov txawv ntawm Abscission thiab Senescence nyob rau hauv daim ntawv Tabular
Summary – Abscission vs Senescence
Abscission yog kev sib cais ntawm cov nroj tsuag xws li paj, txiv hmab txiv ntoo, nplooj, thiab lwm yam los ntawm cov niam txiv cog. Senescence yog qhov kev laus ntawm cov hlwb uas cov hlwb tsis sib faib thiab nkag mus rau hauv ib theem ntawm lub voj voog ntawm tes. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm abscission thiab senescence. Abscission yog ib qho tseem ceeb rau cov nroj tsuag thiaj li yuav pov tseg senescent los yog physiologically puas cov nroj tsuag. Senescence yog qhov tseem ceeb rau kev ciaj sia ntawm cov nroj tsuag lossis nws cov tiam tom ntej.
