Qhov Tseem Ceeb Qhov txawv - Microsporogenesis vs Microgametogenesis
Lub tsev me me ntawm angiosperms yog paj. Ib lub paj muaj ob chav ua me nyuam; androecium thiab gynoecium. Androecium yog tus txiv neej lub cev xeeb tub thaum lub gynoecium yog poj niam cev xeeb tub. Lub androecium muaj anther thiab filament thiab gynoecium muaj stigma, style, thiab zes qe menyuam. Microsporogenesis thiab microgametogenesis tshwm sim nyob rau hauv anther ntawm androecium. Microsporogenesis yog txheej txheem ntawm kev tsim cov paj ntoos nplej (microspores) los ntawm cov ntaub so ntswg sporogenous thiab microgametogenesis yog cov txheej txheem ntawm kev tsim cov txiv neej gametes los ntawm cov generative cell nucleus uas muaj nyob rau hauv cov paj ntoos nplej los ntawm mitosis. Qhov no yog qhov sib txawv tseem ceeb ntawm Microsporogenesis thiab Microgametogenesis.
YMicrosporogenesis yog dab tsi?
Microsporogenesis yog txheej txheem uas tshwm sim thaum lub sijhawm cog qoob loo. Raws li qhov tseeb dav dav, thaum tus txheej txheem no, microgametophyte tsim nyob rau hauv cov paj noob hlis. Txoj kev loj hlob no tshwm sim nyob rau hauv ib theem peb-celled. Hais txog flowering nroj tsuag; angiosperms, cov txheej txheem microsporogenesis tshwm sim nrog kev koom tes ntawm microspore niam cell. Lub microspore niam cell muaj nyob rau hauv lub anther ntawm lub paj, uas yog ib qho ntawm ob ntu ntawm androecium (txiv neej reproductive unit ntawm angiosperm paj).
Nyob rau hauv kev tshuaj xyuas ntu ntu, lub anther tshwm nrog ob lub lobes sib txawv. Txhua lobe muaj ob lub microsporangia (thecae). Ib qho anther yog tsim los ntawm 04 microsporangia. Muaj 4 txheej txheej cell fertile hauv txhua microsporangium. Lawv yog (los ntawm sab nraud mus rau sab hauv), epidermis, endothecium, nruab nrab txheej thiab tapetum. Cov hlwb no hu ua sporogenous cells. Cov txheej txheej feem ntau, uas yog tapetum, muaj cov kab mob tsis muaj menyuam. Lub luag haujlwm ntawm tapetum yog muab cov khoom noj rau kev tsim cov paj paj ntoo.
Lwm peb hom sporogenous hlwb uas loj hlob mus rau microspore niam hlwb yog diploid (2n). Cov microspore niam cov hlwb no tseem hu ua microsporocytes. Cov microsporocytes tau txais kev faib meiotic los ua plaub (04) microspore hlwb uas yog haploid (n). Tube cell thiab cov generative cell yog tsim los ntawm mitotic faib ntawm cov haploid microspore hlwb.
Microgametogenesis yog dab tsi?
Microgametogenesis yog txheej txheem los ntawm kev txhim kho kev loj hlob ntawm unicellular microspores nyob rau hauv qhov chaw uas lawv tau tsim kom loj hlob microgametophytes uas muaj gametes. Kev loj hlob theem ntawm microspores tshwm sim nrog qhov pib ntawm kev nthuav dav ntawm microspore. Nyob rau theem no, ib lub vacuole loj yog tsim nyob rau hauv lub microspore cell. Qhov tsim ntawm vacuole ua rau kev txav ntawm lub nucleus ntawm microspore mus rau qhov chaw eccentric. Kev hloov pauv ntawm cov nucleus tshwm sim tawm tsam phab ntsa ntawm microspore cell. Ntawm txoj hauj lwm no nyob rau hauv lub cell, lub nucleus undergoes mitosis.
Daim duab 01: Microgametogenesis ua ib feem ntawm Angiosperm Life Cycle
Qhov kev faib mitotic no hu ua paj ntoos mitosis kuv (thawj paj ntoos mitosis). Ntawm no, los ntawm qhov kev faib tawm no, 4 lub hlwb sib txawv tau tsim. Lawv suav nrog ob lub hlwb tsis sib xws, ib lub xovtooj me me, thiab lub cell loj. Cov hlwb no muaj cov nucleus haploid. Lub generative cell yuav tau detached los ntawm phab ntsa ntawm pollen grain. Txoj hmoo ntawm lub generative cell txiav txim siab los ntawm lub loj vegetative cell uas engulfs nws. Qhov no ua rau txoj kev loj hlob ntawm ib tug tshwj xeeb qauv uas yog ib tug cell nyob rau hauv ib tug cell. Lub engulfed generative cell lub mitotically faib. Qhov kev faib no yog hu ua pollen mitosis II (thib ob pollen mitosis). Qhov tshwm sim ntawm qhov kev faib mitotic no yog los yog ob tug txiv neej gametes.
Dab tsi yog qhov zoo sib xws ntawm Microsporogenesis thiab Microgametogenesis?
- Ob qho tib si Microsporogenesis thiab Microgametogenesis cov txheej txheem tshwm sim hauv lub paj angiosperm.
- Ob qho tib si Microsporogenesis thiab Microgametogenesis koom nrog kev tsim cov cell haploid.
- Lub sijhawm microsporogenesis thiab megasporogenesis, cov spores uas ua rau gametophytes raug tsim.
Qhov txawv ntawm Microsporogenesis thiab Microgametogenesis yog dab tsi?
YMicrosporogenesis vs Microgametogenesis |
|
| Microsporogenesis yog txheej txheem ntawm kev tsim cov paj ntoos nplej (microspores) los ntawm cov ntaub so ntswg sporogenous. | Microgametogenesis yog cov txheej txheem ntawm kev tsim ntawm txiv neej gametes los ntawm cov generative cell nucleus uas muaj nyob rau hauv cov paj ntoos nplej los ntawm mitosis. |
| Chaw Tsim Kho | |
| Microsporangium yog qhov chaw uas microsporogenesis tshwm sim. | Megasporangium yog qhov chaw uas microgametogenesis tshwm sim. |
| Kev tsim cov paj ntoos yog qhov tshwm sim ntawm microsporogenesis. | Kev tsim cov txiv neej gametes yog qhov tshwm sim ntawm microgametogenesis. |
Summary – Microsporogenesis vs Microgametogenesis
Microsporogenesis yog txheej txheem ntawm kev tsim cov paj ntoos nplej (microspores) los ntawm cov ntaub so ntswg sporogenous. Raws li qhov tseeb dav dav, thaum tus txheej txheem no, microgametophyte tsim nyob rau hauv cov paj noob hlis. Txoj kev loj hlob no tshwm sim nyob rau hauv ib theem peb-celled. Microgametogenesis yog cov txheej txheem los ntawm kev txhim kho ntawm cov microspores unicellular microspores qhov chaw uas lawv tau txais kev txhim kho kom paub tab microgametophytes uas muaj gametes. Ob hom kev faib mitotic tshwm sim; pollen mitosis I thiab paj ntoos mitosis II. Cov txiaj ntsig ntawm paj ntoos mitosis kuv yog ob lub hlwb tsis sib xws, ib lub xovtooj me me, thiab lub cell loj. Cov txiaj ntsig ntawm pollen mitosis II yog tsim los ntawm ob lub phev hlwb. Qhov no yog qhov txawv ntawm microsporogenesis thiab microgametogenesis.
