Basa reChloroplast seMuzinda wePhotosynthesis muMiti
Machloroplast, maorganelles akasarudzika emasero emiti nemamwe algae, ndiwo musimboti wekuita photosynthesis, iyo simba rechiedza rinoshandurwa kuita simba remakemikari kuti ripe simba kuzvinhu zvipenyu. Basa iri rakaoma uye rinokosha rinoita kuti machloroplast ave zvinhu zvakakosha pakuchengetedza hupenyu hwezvirimwa uye, nekuwedzera, hupenyu paNyika. Kuti tinzwisise basa guru remachloroplast muphotosynthesis, zvakakosha kuongorora maumbirwo awo, mashandiro, uye nzira dzebiochemical dzavanofambisa.
Maumbirwo uye Kuumbwa kweChloroplasts
Ma chloroplast ndeeboka rema organelles anonzi ma plastids, ane chimiro che double-membrane envelope. Ma organelles aya anowanzo kuwanikwa akawanda mukati memasero emiti, zvichiratidza kukosha kwawo mumabasa emasero. Mukati mema chloroplast, zvinhu zvakawanda zvakakosha pakugadzira photosynthesis: thylakoid membrane system, stroma, uye chlorophyll.
Sisitimu ye thylakoid membrane ine network yezvikamu zvakaita se disc zvakarongwa zvinonzi grana, zvakabatana ne lamellae. Mukati me thylakoid membrane mune pigments dze photosynthetic, kunyanya chlorophyll, pamwe chete nemapuroteni uye cofactors akakosha pakuita kwe photosynthesis zvinoenderana nechiedza. Chlorophyll, iyo pigment huru, inonwisa chiedza zvakanyanya muzvikamu zvebhuruu netsvuku zve electromagnetic spectrum uye inoratidza chiedza chegirini, zvichipa zvirimwa ruvara rwazvo rwazvino.
Stroma inzvimbo yakazara nemvura yakakomberedza membrane ye thylakoid, ine ma enzymes, ribosomes, uye chloroplast DNA. Matrix iyi inobatsira kuti photosynthesis ishande pasina chiedza, inozivikanwa seCalvin cycle, uko kugadzirwa kwemakabhohaidhiretsi kunoitika.
Nzira yeBiochemical yePhotosynthesis
Photosynthesis inogona kukamurwa kuita zvikamu zviviri zvikuru: maitiro anoenderana nechiedza uye maitiro anoenderana nechiedza (Calvin cycle).
Maitiro Anobva Kuchiedza
Maitiro anoenderana nechiedza, anoitika mukati me thylakoid membranes, anosanganisira kutorwa kwechiedza ne chlorophyll nedzimwe pigments. Simba iri rinomutsa maerekitironi uye rinoafambisa kuburikidza necheni yemapuroteni anozivikanwa se electron transport chain (ETC). Matanho makuru emaitiro aya anosanganisira:
1. Kubviswa kwemvura kubva muchiedza: Simba rechiedza rinopatsanura mamorekuru emvura kuita okisijeni, mapurotoni, nemaerekitironi. Okisijeni inoburitswa sechinhu chimwe chete, zvichibatsira muokisijeni yemuchadenga wePasi.
2. Photophosphorylation: Maerekitironi anofara anofamba nemuETC, nesimba rawo richishandiswa kupomba mapurotoni mumembrane yethylakoid, zvichigadzira proton gradient. Iyi gradient inosimbisa kugadzirwa kweATP kubva kuADP uye inorganic phosphate kuburikidza neenzyme ATP synthase.
3. Kuumbwa kweNADPH: Maerekitironi anozopedzisira aderedza NADP+ kuita NADPH, zvichipa simba rekuderedza pamatanho anotevera efotosinthhesi.
Maitiro aya anoshandura simba rechiedza kuita simba remakemikari rakachengetwa muATP neNADPH, iro rinoshandiswa mustroma panguva yeCalvin cycle.
Calvin Cycle (Kuita Kwechiedza Kusingazvimiriri)
Kutenderera kwaCalvin, kunoitika mustroma, kunobatanidza kabhoni dhayokisaidhi mumhepo inodziya muzvinhu zvipenyu kuburikidza nemaitiro anonzi carbon fixation. Kutenderera uku kune matanho matatu makuru:
1. Kugadzika Kabhoni: Enzayimu inonzi ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) inokonzeresa kubatana kweCO2 neribulose-1,5-bisphosphate (RuBP), ichigadzira kabhoni katanhatu kasina kugadzikana iyo inopatsanuka pakarepo kuita mamorekuru maviri e3-phosphoglycerate (3-PGA).
2. Chikamu Chekuderedza: ATP neNADPH zvinogadzirwa kubva mukuita kwechiedza zvinoderedza 3-PGA kuita glyceraldehyde-3-phosphate (G3P). Danho iri rakakosha pakugadzirwa kweglucose nemamwe makabhohaidhiretsi.
3. Kuvandudzwa kweRuBP: Kutenderera kweCalvin kunofanira kuvandudza RuBP kuti kurambe kuripo. Pamamorekuru matanhatu eG3P anogadzirwa, rimwe chete ndiro rinobuda mudenderedzwa kuti ribatsire mukugadzirwa kwemakabhohaidhiretsi. Mamorekuru eG3P asara anovandudza mamorekuru matatu eRuBP, zvichiita kuti pave nekuenderera mberi.
Kutenderera kweCalvin kunoratidza kushanda zvakanaka kwema chloroplast mukushandura kabhoni isina kugadzirwa kuita makemikari eorganic, zvichigadzira hwaro hwesimba rinopihwa nechirimwa.
Chloroplasts: Kupfuura Photosynthesis
Kunze kwebasa rawo guru mu photosynthesis, ma chloroplast ane basa mune mamwe mabasa akawanda emasero. Izvi zvinosanganisira:
1. Kugadzirwa kweMafuta neMaamino Acids: Machloroplast anoita basa guru mukugadzira mabiomolecule akakosha akadai semafuta acids nemaamino acids, ayo akakosha pakugadzirwa kwemasero uye biochemistry.
2. Kubatanidzwa Mumhinduro Dzekudzivirira Midziyo: Ma chloroplast anobatsira mukudzivirira kwemiti nekugadzira mhando dzeokisijeni dzinoita basa (reactive oxygen species - ROS) mukupindura kurwiswa kwezvirwere, zvichibatsira munzira dzinopa zviratidzo zvinomutsa mhinduro dzemuviri.
3. Kushandiswa kweMetabolism: Ma chloroplast anobatanidzwa mukushandiswa kwenitrogen nesarufa, zvichiita kuti zvinhu izvi zvisanganisirwe mumakemikari eorganic anodiwa pakukura kwezvirimwa.
mhedziso
Ma chloroplast anokosha pahupenyu hwemiti, kunyanya nekuda kwebasa rawo mu photosynthesis, uko anoshandura simba rechiedza kuita simba remakemikari kuburikidza nekuita kwechiedza uye Calvin cycle. Uyezve, aya ma organelles anobatsira mukugadzirwa kwema biomolecules akakosha uye anobatanidzwa mukudzivirira, zvichiratidza mabasa awo akawanda mu metabolism yemasero. Senzvimbo dzebasa re biochemical, ma chloroplast anosimbisa kuomarara uye kuchinjika kwemasero emiti mukuchengetedza kukura, kukura, uye kurarama. Kunzwisisa mabasa akaomarara ema chloroplast hakungotsananguri chete biology yemiti asiwo kunoratidza maitiro ekutanga anotsigira biosphere yePasi.
