Auxin txhawb Geotropism li cas?
Auxin txhawb Geotropism li cas?

Video: Auxin txhawb Geotropism li cas?

Video: Auxin txhawb Geotropism li cas?
Video: Auxins and Phototropism (2016) 2024, Kaum ib hlis
Anonim

Paub tias cov tshuaj hormones hu ua cov auxins tswj phototropism thiab gravitropism ( Geotropism ). Auxin yog ua nyob rau hauv cov lus qhia ntawm tua thiab cov hauv paus hniav, ua soluble, nws txav rov qab los ntawm diffusion mus txhawb nqa cell loj hlob - txheej txheem ntawm cell o thiab elongation.

Tsis tas li ntawd, auxin tswj Geotropism li cas?

Ob qho tib si phototropism thiab Geotropism yog tswj los ntawm kev faib tawm ntawm auxin ua nyob rau hauv cov nroj tsuag cell: nyob rau hauv Geotropism , auxin ua yuav sau nyob rau sab qis ntawm cov nroj tsuag teb rau lub zog ntawm lub ntiajteb txawj nqus. Nyob rau hauv phototropism, lub teeb receptors (phototropins) ua rau redistribution ntawm auxin ua mus rau qhov tsaus ntuj ntawm cov nroj tsuag.

Tom qab ntawd, lo lus nug yog, auxin txhawb kev loj hlob hauv paus li cas? Auxins yog cov muaj zog kev loj hlob hormonal tsim los ntawm cov nroj tsuag. Lawv pom nyob rau hauv tua thiab hauv paus tswv yim thiab txhawb cell division, qia thiab hauv paus kev loj hlob . Lawv kuj tuaj yeem cuam tshuam rau tsob nroj orientation los ntawm txhawb cell faib rau ib sab ntawm cov nroj tsuag nyob rau hauv teb rau hnub ci thiab lub ntiajteb txawj nqus.

Ntxiv mus, auxin cuam tshuam li cas rau Gravitropism?

Kev loj hlob vim gravitropism yog kho los ntawm kev hloov hauv concentration ntawm cov nroj tsuag hormone auxin ua nyob rau hauv cov nroj tsuag cell. Hauv stems, lub auxin ua kuj accumulates nyob rau sab qis, tab sis nyob rau hauv cov ntaub so ntswg nws nce cell expansion thiab ua rau tua curving li (tsis zoo. gravitropism ).

auxin txhawb nqa Phototropism li cas?

Auxin yog cov tshuaj hormones uas feem ntau yog synthesized nyob rau hauv cov tub ntxhais hluas ntsis ntawm cov hauv paus hniav thiab tua. Thaum lub teeb los ntawm ib sab ntawm cov nroj tsuag, nws diffuses mus rau lub shady sab ntawm tua uas nkoos lub hlwb kom loj hlob ntev, uas ua rau lub khoov ntawm tua ntawm lub teeb, yog li ntawd. auxin txhawb nqa phototropism.

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