Qhov sib txawv tseem ceeb ntawm photooxidation thiab photorespiration yog tias photooxidation yog cov txheej txheem oxidation uas tshwm sim los ntawm lub hnub, thaum photorespiration yog ib qho pov tseg cov tshuaj tiv thaiv ntawm photosynthesis uas enzyme Rubisco oxygenates RuBP, ua rau qee lub zog los nkim.
Photooxidation thiab photorespiration yog ob txheej txheem uas raug ntxias los ntawm tshav ntuj. Hauv cov nroj tsuag, ob txoj kev no cuam tshuam rau kev ua haujlwm ntawm cov ntaub so ntswg. Photooxidation yog lub luag hauj lwm rau tsub zuj zuj ntawm cov teeb meem reactive oxygen hom nyob rau hauv cov ntaub so ntswg. Ntawm qhov tod tes, photorespiration yog lub luag haujlwm rau lub zog-nkim hauv cov nroj tsuag.
YPhotooxidation yog dab tsi?
Photooxidation yog ib qho teeb meem uas tshwm sim los ntawm kev poob hluav taws xob los ntawm cov tshuaj lom neeg lossis cov txheej txheem ntawm cov tshuaj tiv thaiv nrog oxygen. Hauv cov nroj tsuag, photooxidation tshwm sim thaum muaj kev ntxhov siab ib puag ncig. Li no, nws yog hu ua photooxidative kev nyuaj siab. Kev nqus ntawm lub zog excitation ntau dhau ua rau tsim cov pa oxygen reactive hauv cov ntaub so ntswg. Kev sib sau ntawm cov pa oxygen reactive no yog cov txheej txheem tsim kev puas tsuaj hauv cov nroj tsuag uas ua rau chloroplasts puas. Qhov kev ntxhov siab photooxidative no tshwm sim feem ntau nyob rau hauv lub xub ntiag ntawm high-siv lub teeb thiab ib tug tsawg concentration ntawm CO2 Nws yog ib tug lub teeb-dependent txheej txheem. Hauv C3 cov nroj tsuag, photorespiration tiv thaiv cov nroj tsuag los ntawm photooxidation.
Daim duab 01: Photooxidation
Ntxiv rau, photooxidation muaj peev xwm hloov cov roj muaj pes tsawg leeg. Hnub ci thiab oxygen ua rau oxidation ntawm cov roj. Qhov no yog ib qho txheej txheem tseem ceeb vim nws tshem tawm cov roj ntau ntawm cov dej hiav txwv. Yog li ntawd, thaum cov roj nchuav raug tshav ntuj vim cov txheej txheem photooxidation, lawv raug tshem tawm ntawm hiav txwv.
Photorespiration yog dab tsi?
Photorespiration yog ib qho kev tawm tsam ntawm Calvin lub voj voog uas ua rau lub zog ntawm qee lub zog tsim los ntawm photosynthesis. Thaum lub sij hawm Calvin lub voj voog, ib qho enzyme tseem ceeb hu ua RuBP oxygenase-carboxylase (rubisco) converts RuBP rau hauv phosphoglyceraldehyde los ntawm kev sib xyaw carbon dioxide. Qhov no yog cov txheej txheem ntawm kev tsim cov piam thaj molecules. Txawm li cas los xij, cov enzyme no muaj peev xwm ua ke nrog cov pa oxygen es tsis txhob carbon dioxide. Qhov ntawd txhais tau tias rubisco muaj peev xwm siv cov pa oxygen ua nws cov substrate es tsis txhob carbon dioxide. Thaum qhov no tshwm sim, nws pib cov txheej txheem saum toj no hu ua: photorespiration. Photorespiration yeej nkim lub zog thiab qee cov pa roj carbon monoxide. Tsis tas li ntawd, nws txo cov piam thaj molecules uas tuaj yeem tsim los ntawm lub voj voog Calvin ib txwm.
Daim duab 02: Photorespiration
Photorespiration yog nyiam los ntawm ntau yam kev mob xws li cov pa roj carbon dioxide tsawg: oxygen piv, kub siab, thiab lwm yam. Thaum kub nce, rubisco enzyme muaj kev sib raug zoo dua rau oxygen dua carbon dioxide. Yog li ntawd, cov nroj tsuag uas loj hlob nyob rau hauv kub thiab qhuav tej yam kev mob undergo photorespiration ntau tshaj cov nroj tsuag zus nyob rau hauv lwm qhov chaw. Txawm li cas los xij, cov nroj tsuag qhia kev hloov pauv thiab cov txheej txheem sib txawv kom txo qis photorespiration thiab poob ntawm lub zog. Ib qho piv txwv yog C4 nroj tsuag.
Dab tsi yog qhov zoo sib xws ntawm Photooxidation thiab Photorespiration?
- Photooxidation thiab photorespiration yog cov txheej txheem ntawm lub teeb.
- Ob txheej txheem tuaj yeem pom hauv cov nroj tsuag.
- Cov no yog cov txheej txheem ntuj tsim.
- Ob qho kev tshwm sim tuaj yeem tshwm sim hauv chloroplasts.
- Lawv yog tshuaj lom neeg.
- Oxygen koom nrog hauv ob txheej txheem.
Qhov txawv ntawm Photooxidation thiab Photorespiration yog dab tsi?
Photooxidation yog cov txheej txheem oxidation tshwm sim los ntawm lub hnub ci, thaum photorespiration yog ib qho pov tseg cov tshuaj tiv thaiv ntawm photosynthesis uas cov enzyme Rubisco oxygenates RuBP ua rau qee lub zog yuav tsum tau nkim. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm photooxidation thiab photorespiration. Ntxiv mus, photooxidation yog kev puas tsuaj rau cov nroj tsuag, thaum photorespiration tsis cuam tshuam rau cov nroj tsuag.
Cov hauv qab no infographic nthuav tawm qhov sib txawv ntawm photooxidation thiab photorespiration hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Photooxidation vs Photorespiration
Photooxidation thiab photorespiration yog cov txheej txheem ntawm lub teeb. Photooxidation yog cov txheej txheem oxidation tshwm sim los ntawm lub hnub ci thaum photorespiration yog ib qho pov tseg cov tshuaj tiv thaiv ntawm photosynthesis nyob rau hauv uas lub enzyme Rubisco oxygenates RuBP, ua rau qee lub zog yuav tsum tau nkim. Yog li, qhov no qhia txog qhov sib txawv ntawm photooxidation thiab photorespiration.
