Qhov sib txawv tseem ceeb ntawm collenchyma thiab sclerenchyma yog tias collenchyma yog ib hom ntawm cov nroj tsuag nyob uas muaj cov phab ntsa tuab tsis tu ncua thaum sclerenchyma yog hom kab mob tuag uas muaj cov phab ntsa tuab tuab heev.
Muaj peb hom ntaub so ntswg hauv av hauv cov nroj tsuag. Lawv yog cov parenchyma, collenchyma, thiab sclerenchyma. Parenchyma hlwb yog cov kab mob dav dav ntawm cov nroj tsuag thiab ua rau hauv av thiab cov ntaub so ntswg. Lawv muaj sia nyob ntawm kev loj hlob thiab pab hauv photosynthesis thiab khaws cia. Collenchyma yog lwm hom ntawm cov ntaub so ntswg hauv av uas muaj cov phab ntsa ntawm cov phab ntsa tsis sib xws. Feem ntau, lawv kuj yog cov nyob hauv hlwb uas muab kev txhawb nqa thiab cov qauv. Hom thib peb, sclerenchyma, feem ntau yog cov cell tuag uas muaj cov phab ntsa tuab tuab heev. Lawv muab rigidity rau cov nroj tsuag. Kab lus no yuav tham txog qhov txawv ntawm collenchyma thiab sclerenchyma.
Collenchyma yog dab tsi?
Collenchyma hlwb dais muaj zog zoo ib yam li parenchyma. Txawm li cas los xij, lawv muaj qee qhov txawv txav. Lawv tshwm sim nyob rau hauv pawg tsuas yog hauv qab lub epidermis. Tsis tas li ntawd, lawv muaj cov phab ntsa ntawm tes, uas muaj ntau pectins. Yog li, lawv stain hauv paj yeeb nrog Toluidine xiav. Tsis tas li ntawd, lub cell phab ntsa ntawm collenchyma hlwb yog unevenly thickened. Cov hlwb no yog tus cwj pwm los ntawm thickening ntawm phab ntsa ntawm tes, thiab lawv tseem ciaj sia, txawm tias thaum loj hlob, tsis zoo li cov hlwb sclerenchyma. Tsis tas li ntawd, lawv zoo li tshwm sim raws li ib feem ntawm cov vascular bundles los yog ntawm cov ces kaum ntawm angular stems. Cov thickening tuaj yeem tshwm sim ntawm cov ces kaum ntawm cov hlwb uas nyob ib sab lossis raws phab ntsa tangential.
Daim duab 01: Collenchyma Cells
Collenchymas hlwb muaj qee qhov sib tshooj ntawm lawv cov phab ntsa kawg. Cov hlwb no ib txwm muaj sia nyob. Tsis tas li ntawd, cov no yog cov hlwb elongated thiab muaj cov txheej txheem thib ob ntawm cellulose hauv cov phab ntsa ntawm tes. Lawv feem ntau nyob ib qho chaw peripheral. Cov hlwb no kuj yog yas thiab elastic raws li lawv ua ke tensile zog nrog yooj thiab plasticity. Nws yog thawj cov ntaub so ntswg uas tshwm sim hauv cov nroj tsuag loj hlob. Lub thickened ib feem ntawm cell phab ntsa muab kev txhawb nqa, thiab cov thinner qhov chaw tso cai rau stretching thiab loj hlob ntawm cov cell thiab solute hloov mus rau hauv lub phab ntsa. Phab ntsa muaj dej ntau; yog li ntawd lawv glisten nyob rau hauv cov seem tshiab. Feem ntau, collenchymas hlwb pob ze. Txawm li cas los xij, qhov chaw huab cua intercellular qee zaum pom ntawm lub xov tooj ntawm tes. Lawv tshwm sim raws li cov hlua los yog cov thooj voos kheej kheej txuas ntxiv hauv cov nroj tsuag lub cev. Txawm li cas los xij, cov hlwb collenchymas tsis tshua muaj nyob hauv cov hauv paus hniav.
Sclerenchyma yog dab tsi?
Sclerenchyma cov ntaub so ntswg yog hom thib peb ntawm cov ntaub so ntswg hauv av uas muaj nyob hauv cov nroj tsuag. Lawv feem ntau yog cov hlwb tuag uas muab kev txhawb nqa thiab rigidity rau cov nroj tsuag. Qhov tseeb, nws yog cov ntaub so ntswg hauv av uas txhawb nqa cov nroj tsuag. Sclerenchyma cells tso tseg cov cell o. Tom qab ntawd, theem nrab thickenings tshwm sim. Feem ntau, cov hlwb sclerenchyma muaj cov phab ntsa tuab tuab uas muaj cellulose microfibrils thiab lignin. Yog li lawv tsis muaj cytoplasm lossis nucleus. Thaum kawg, lawv tuag thiab nyuaj. Yog li ntawd, thaum staining, sclerenchyma hlwb tshwm liab raws li qhia hauv daim duab 02.
Daim duab 02: Sclerenchyma Cells
Sclerenchyma hlwb txhawb cov nroj tsuag thiab tshwm sim raws li pob cap fibers, ib leeg hlwb lossis pab pawg ntawm cov hlwb. Lawv tshwm sim nyob rau hauv lub cortex, phloem, xylem, nras sheath, thiab hypodermis. Ntoo fibers tsis muaj nyob rau hauv gymnosperms thiab qis vascular nroj tsuag.
Muaj ob hom sclerenchyma ua sclereids thiab fibers. Sclereids tshwm sim ib leeg lossis hauv pawg me, thiab feem ntau yog isodiametric txawm tias qee qhov tuaj yeem ntev heev. Sclereid muaj cov pits tseem ceeb thiab feem ntau lignified. Fibers yog heev elongated thiab muaj overlapping kawg phab ntsa. Pits muaj tsawg thiab me me. Lawv tshwm sim hauv pob.
Dab tsi yog qhov zoo sib xws ntawm Collenchyma thiab Sclerenchyma?
- Collenchymas thiab sclerenchyma yog ob hom cog hlwb.
- Ob hom hlwb txhawb cov nroj tsuag mechanically.
- Tsis tas li ntawd, ob lub cell phab ntsa muaj cellulose.
Qhov txawv ntawm Collenchyma thiab Sclerenchyma yog dab tsi?
Collenchyma hlwb yog cov elongated cog hlwb uas muaj irregularly thickened thawj cell phab ntsa thaum sclerenchyma hlwb yog cov nroj tsuag tuag uas muaj hnyav hnyav phab ntsa phab ntsa. Yog li, peb tuaj yeem xav txog qhov no yog qhov sib txawv tseem ceeb ntawm collenchyma thiab sclerenchyma. Qhov sib txawv ntawm kev ua haujlwm ntawm collenchyma thiab sclerenchyma yog tias cov ntaub so ntswg collenchyma muab kev txhawb zog thiab elasticity rau cov nroj tsuag thaum sclerenchyma cov ntaub so ntswg muab cov neeg kho tshuab kev txhawb nqa thiab rigidity rau cov nroj tsuag.
Tsis tas li ntawd, cov hlwb collenchyma yog cov nyob hauv hlwb thiab muaj cytoplasm thiab nucleus. Ntawm qhov tod tes, sclerenchyma hlwb yog cov hlwb tuag uas tsis muaj cytoplasm thiab nucleus. Yog li, nws yog lwm qhov sib txawv ntawm collenchyma thiab sclerenchyma. Ntxiv mus, qhov sib txawv ntxiv ntawm collenchyma thiab sclerenchyma yog tias cov collenchymas hlwb muaj chlorophylls thiab muaj peev xwm ua tau photosynthesis thaum sclerenchyma hlwb tsis tuaj yeem nqa tawm photosynthesis vim lawv tsis muaj chlorophylls.
Hauv qab infographic qhia txog qhov sib txawv ntawm collenchyma thiab sclerenchyma.
Summary – Collenchyma vs Sclerenchyma
Collenchyma thiab sclerenchyma yog ob hom cog hauv av cov ntaub so ntswg. Collenchyma hlwb yog elongated sub-epidermal hlwb nrog irregularly thickened cell phab ntsa. Ntawm qhov tod tes, sclerenchyma hlwb yog lub hauv paus tseem ceeb txhawb cov hlwb uas muaj cov phab ntsa tuab tuab heev. Cov phab ntsa ntawm cov cellulose muaj cellulose thiab pectin thaum lub cell phab ntsa ntawm sclerenchyma hlwb muaj cellulose, hemicelluloses, thiab lignin. Ntxiv mus, cov hlwb collenchyma yog cov hlwb nyob thaum cov hlwb sclerenchyma yog cov hlwb tuag. Tsis tas li ntawd, collenchyma hlwb muaj cytoplasm thiab nucleus thaum sclerenchyma hlwb tsis. Yog li, qhov no qhia txog qhov sib txawv ntawm collenchymas thiab sclerenchyma.
