Qhov sib txawv tseem ceeb ntawm mesophyll thiab pob sheath hlwb yog tias hauv C4 cov nroj tsuag, lub teeb-nyob ntawm kev cuam tshuam ntawm photosynthesis tshwm sim hauv cov hlwb mesophyll, thaum lub teeb-yeeb yaj kiab los yog Calvin lub voj voog tshwm sim hauv cov ntaub qhwv cell.
C4 nroj tsuag yog ib pawg ntawm cov nroj tsuag uas ua C4 photosynthesis lossis C4 carbon fixation. Cov nroj tsuag no muaj peev xwm txo qis photorespiration los ntawm kev sib cais thawj zaug CO2 fixation thiab Calvin voj voog nyob rau hauv qhov chaw. Txhawm rau ua qhov no, lawv muaj qhov tshwj xeeb ntawm tes hu ua Kranz leaf anatomy. Hauv Kranz lub cev nqaij daim tawv, txhua lub pob vascular yog ib puag ncig los ntawm cov pob txha pob txha. Mesophyll hlwb ces nyob ib puag ncig cov pob sheath cells.
Mesophyll thiab cov pob txha pob txha muaj cov txheej txheem thiab ua haujlwm sib txawv chloroplasts. Mesophyll hlwb muaj cov phab ntsa nyias nyias thiab randomly teem chloroplasts nrog stacked thylakoids. Lawv tsis muaj hmoov txhuv nplej siab granules. Ntawm qhov tod tes, cov ntaub qhwv cov cell muaj cov phab ntsa tuab thiab cov txheej txheem centrifugally chloroplasts nrog cov hmoov txhuv nplej siab loj.
Mesophyll Cells yog dab tsi?
Mesophyll cells yog cov ntaub so ntswg hauv av pom hauv cov nplooj ntoo. Lawv lub luag haujlwm tseem ceeb yog photosynthesis. Muaj ob hom mesophyll hlwb hauv nplooj. Lawv yog palisade parenchyma thiab spongy parenchyma. Ob hom cell muaj chloroplasts thiab tshwm hauv xim ntsuab. Palisade parenchyma yog cov ntaub so ntswg sab sauv uas muaj nyob hauv cov nplooj ntoo. Nws yog nyob rau hauv lub Upper epidermis ntawm dorsiventral nplooj. Nws muaj cov kab uas zoo li columnar. Cov hlwb yog nruj nreem ntim tsis muaj intercellular qhov chaw. Spongy parenchyma yog cov ntaub so ntswg hauv qab thiab thib ob hauv cov nplooj nplooj. Nws yog nyob rau hauv lub palisade parenchyma, nyob rau hauv lub qis epidermis. Spongy parenchyma hlwb yog xoob txheej; Yog li ntawd, muaj ntau qhov chaw intercellular ntawm cov hlwb. Cov hlwb yog oval-puab lossis tsis sib xws.
Daim duab 01: C4 Nroj Ntoo Nplooj Anatomy (A: Mesophyll Cell B: Chloroplast C: Vascular Tissue D: Bundle Sheath Cell E: Stroma F: Vascular Tissue)
Hauv C4 cov nroj tsuag, cov hlwb mesophyll tau sib txawv kom ua tiav tsuas yog lub teeb nyob ntawm kev cuam tshuam ntawm photosynthesis thiaj li txo qis photorespiration. Yog li ntawd, mesophyll hlwb ntawm C4 nplooj nplooj yog pom nyob ib ncig ntawm lub pob sheath hlwb. Lawv muaj cov phab ntsa nyias nyias thiab randomly teem chloroplasts. Tsis tas li ntawd, mesophyll hlwb muaj pawg thylakoids thiab me lossis tsis muaj hmoov txhuv nplej siab.
Bundle Sheath Cells yog dab tsi?
Cov kab mob pob txha yog cov hlwb tshwj xeeb pom hauv C4 nplooj nplooj. Lawv pom nyob ib ncig ntawm nplooj nplooj nyob ib ncig ntawm lub vascular bundles. Lub teeb-yeeb yaj kiab ntawm photosynthesis lossis Calvin lub voj voog tshwm sim nyob rau hauv cov ntaub qhwv cell. Rubisco enzyme nyob rau hauv cov ntaub qhwv cell kho CO2 thiab tsim cov suab thaj.
Daim duab 02: Bundle Sheath Cells
Cov kab mob pob txha muaj cov phab ntsa tuab. Ntxiv mus, lawv muaj centrifugally teem chloroplasts. Lawv muaj starch granules thiab unstacked thylakoid membranes.
Dab tsi yog qhov zoo sib xws ntawm Mesophyll thiab Bundle Sheath Cells?
- Ob qho tib si mesophyll thiab bundle sheath cells yog cov nroj tsuag nyob.
- Lawv pom muaj nyob hauv C4 nplooj nplooj.
- Ob hom hlwb yog cov hlwb sib txawv.
- Lawv sib cuag.
- Ntxiv mus, ob hom hlwb muaj chloroplasts thiab chlorophylls, thiab lawv koom nrog hauv photosynthesis.
- Muaj kev faib ua haujlwm ntawm mesophyll thiab pob sheath cells hauv C4 nroj tsuag.
Qhov txawv ntawm Mesophyll thiab Bundle Sheath Cells yog dab tsi?
Mesophyll hlwb yog cov hlwb hauv C4 cov nroj tsuag uas ua rau lub teeb nyob ntawm kev cuam tshuam ntawm photosynthesis. Nyob rau hauv sib piv, bundle sheath cells yog cov hlwb nyob ib ncig ntawm nplooj nplooj ntawm cov nroj tsuag C4 uas ua tawm lub teeb-yooj yim kev xav. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm mesophyll thiab bundle sheath cells. Tsis tas li ntawd, lwm qhov sib txawv ntawm mesophyll thiab bundle sheath cells yog cov hlwb mesophyll nqa tawm cov tshuaj tiv thaiv lub teeb hauv C4 cov nroj tsuag, thaum lub pob sheath hlwb ua cov tshuaj tiv thaiv tsaus nti hauv C4 cov nroj tsuag.
Tsis tas li ntawd, cov hlwb mesophyll muaj nyob hauv nruab nrab ntawm cov nplooj nyob ib ncig ntawm cov pob txha pob txha, thaum cov pob txha pob txha muaj nyob ib puag ncig cov nplooj ntoo. Tsis tas li ntawd, cov txheej txheem, cov hlwb mesophyll muaj cov phab ntsa nyias nyias thaum lub pob sheath cells muaj cov phab ntsa tuab.
Cov hauv qab no qhia txog qhov sib txawv ntawm mesophyll thiab pob sheath cells.
Summary – Mesophyll vs Bundle Sheath Cells
Nyob rau hauv C4 nroj tsuag, ob qho tib si mesophyll thiab bundle sheath cells yog cov ntaub so ntswg photosynthetic. Mesophyll hlwb muaj nyob rau hauv nruab nrab ntawm nplooj nyob ib ncig ntawm lub pob sheath hlwb. Cov tshuaj tiv thaiv lub teeb-dependent tshwm sim nyob rau hauv mesophyll hlwb hauv C4 nroj tsuag. Ntawm qhov tod tes, cov ntaub qhwv cov kab mob nyob ib puag ncig nplooj nplooj lossis cov kab mob vascular ntawm C4 cov nroj tsuag. Lub teeb-yeeb yam tshuaj tiv thaiv tshwm sim nyob rau hauv cov ntaub qhwv sheath hlwb. Yog li, qhov no yog cov ntsiab lus ntawm qhov sib txawv ntawm mesophyll thiab bundle sheath cells.
