Qhov sib txawv tseem ceeb ntawm nucellus thiab tapetum yog qhov nucellus yog lub hauv paus cellular loj ntawm lub ovule uas muaj cov embryo sac thaum tapetum yog ib txheej tshwj xeeb ntawm cov hlwb uas muaj nyob rau hauv lub anther.
Nucellus thiab tapetum yog ob lub qauv pom hauv paj. Nucellus pom nyob rau hauv lub ovule thaum tapetum pom nyob rau hauv lub anther. Nucellus yog lub hauv paus loj ntawm cov ntaub so ntswg nyob rau hauv lub ovule uas muaj embryo sac. Nucellus degenerates tom qab fertilization, muab cov as-ham rau cov tub ntxhais hluas embryo thiab loj hlob endosperm. Tapetum yog cov txheej txheem tshwj xeeb ntawm cov khoom noj hauv lub cev uas muab cov khoom noj thiab cov enzymes xav tau rau microsporogenesis thiab paj ntoos maturation.
Nucellus yog dab tsi?
Nucellus yog lub hauv paus cellular loj ntawm ovule. Nws muaj lub embryo sac, thiab nws yog surrounded los ntawm integuments. Nuclellus encloses tus tsim embryo. Nws kuj tseem ceeb heev rau kev tsim cov noob. Hauv qee cov ovules cog, nucellus yog 5 mus rau 10 cell txheej tuab nyob rau hauv thaj tsam ntawm cov tshuaj tiv thaiv kab mob, tsuas yog ib lossis ob peb txheej ze ze rau lub qe apparatus.
Daim duab 01: Nucellus
Feem ntau, hauv angiosperms, qhov loj ntawm nucellus degenerates tom qab fertilization. Thaum degenerating, nucellus muab cov as-ham rau cov tub ntxhais hluas embryo thiab loj hlob endosperm, tawm hauv kab noj hniav uas lub embryo thiab endosperm loj hlob. Qhov loj thiab cov duab ntawm nucellus txawv ntawm cov nroj tsuag sib txawv. Li no, nws tuaj yeem raug coj los ua ib qho kev kuaj mob.
Tapetum yog dab tsi?
Tapetum yog cov khoom noj khoom haus txheej ntawm cov hlwb uas ua rau cov phab ntsa sab hauv ntawm lub hnab paj ntoos. Tapetum muaj nyob rau hauv anthers ntawm flowering nroj tsuag. Qhov tseeb qhov chaw ntawm tapetum yog nruab nrab ntawm cov ntaub so ntswg sporogenous thiab phab ntsa anther. Tapetum muab cov as-ham thiab tswj cov molecules los tsim paj paj noob qoob. Yog li ntawd, tapetum yog ib qho tseem ceeb heev rau kev loj hlob ntawm paj ntoos nplej ntawm flowering nroj tsuag. Cells ntawm tapetum feem ntau yog loj dua thiab muaj ntau tshaj ib tug nucleus rau ib lub cell. Cov kab mob tapetal tseem nyob tsis zoo tab sis ua absorbed thaum lawv muab cov as-ham. Muaj ob peb lwm txoj haujlwm ntawm tapetum, xws li kev pab hauv paj ntoos phab ntsa tsim, kev thauj mus los ntawm cov as-ham mus rau sab hauv ntawm anther thiab synthesis ntawm callase enzyme rau kev sib cais ntawm microspore tetrads, thiab lwm yam.
Daim duab 02: Tapetum ntawm Lilium Anther
Muaj ob lub ntsiab ntawm tapetum ua secretory (glandular) thiab plasmodial (amoeboid). Magnoliales thiab lwm cov tswv cuab thaum ub muaj secretory los yog glandular hom tapetum thaum amoeboid tapetum muaj nyob rau hauv cov nroj tsuag ntawm Lauraceae (Laurales).
Dab tsi zoo sib xws ntawm Nucellus thiab Tapetum?
- Ob leeg nucellus thiab tapetum muaj peev xwm muab cov khoom noj.
- Lawv feem ntau pom hauv cov paj ntoo.
- ob leeg yog cell masses.
- Lawv degenerate thaum lawv ua tiav.
- Nucellus hlwb yog absorbed los ntawm cov embryo tsim thaum tapetal hlwb yog absorbed los ntawm tsim paj paj nplej.
Qhov txawv ntawm Nucellus thiab Tapetum yog dab tsi?
Lub nucellus yog lub hauv paus cellular loj tam sim no nyob rau hauv lub ovule thaum tapetum yog cov khoom noj khoom haus cellular txheej pom nyob rau hauv lub anther. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm nucellus thiab tapetum. Tsis tas li ntawd, nucellus yog ib feem ntawm cov poj niam cev xeeb tub cov qauv ntawm lub paj thaum tapetum belongs rau txiv neej kev loj hlob qauv ntawm paj. Yog li, qhov no kuj yog qhov sib txawv tseem ceeb ntawm nucellus thiab tapetum.
Ntxiv mus, txoj haujlwm ntawm nucellus yog muab cov as-ham rau cov menyuam mos thiab cov endosperm loj hlob thaum lub luag haujlwm ntawm tapetum yog muab cov as-ham thiab lwm yam kev tswj hwm molecules rau kev tsim paj paj nplej.
Hauv qab infographic teev ntau qhov sib txawv ntawm nucellus thiab tapetum hauv daim ntawv tabular.
Summary – Nucellus vs Tapetum
Lub nucellus yog lub hauv paus cellular loj hauv ovule. Nws muaj lub embryo sac thiab degenerates tom qab fertilization. Degeneration ntawm nucellar hlwb muab cov as-ham nrog rau qhov chaw rau kev tsim endosperm thiab embryo. Tapetum yog cov khoom noj khoom haus txheej ntawm cov hlwb pom ntawm cov ntaub so ntswg sporogenous thiab phab ntsa anther. Nws muab cov as-ham thiab tswj cov molecules los tsim paj paj noob qoob. Yog li, qhov no qhia txog qhov sib txawv ntawm nucellus thiab tapetum.
