Vai Tro Sinh Li Cua Auxin

7/29/2019 Vai Tro Sinh Li Cua Auxin

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VAI TR SINH L CA AUXIN

Nhm thc hin:Dng Th

TuytL Th Thanh

Xun

Nguyn ThKhnhNguyn Th

Hng Vn

GV: Phm Lng Hng


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NI DUNG

Lch s pht hin ra auxin

Cu to v phn loi auxin

Tng hp v phn hy auxin Vai tr sinh l ca auxin

C ch tc dng ca auxin


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I- Lch s pht hin ra auxin- 1880 Darwin pht hin ra rng bao l mm ca cy h la nhy cm vi nh sng

- 1919 Paal kt lun rng nh ngn hnh thnh mt cht sinh trng no y cn nh

sng xc nh s phn b ca cht v hai pha ca bao l mm
http://var/www/apps/conversion/tmp/scratch_4/video/Hormonas%20vegetais_%20auxinas.mp4http://var/www/apps/conversion/tmp/scratch_4/video/Hormonas%20vegetais_%20auxinas.mp4


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- 1928 Went cho rng nh sng gy nn s vn chuyn v phn b ca cht

sinh trng hai pha ca bao l mm


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- 1934 Kogl (H Lan) tch c cht c hot tnh tng t cht sinh trng

- 1935 Thimann tch c cht ny t nm Rhysopus

- 1977 Wightman pht hin ra APA (axit phenylaxetic). Mt s thc vtl INA ( indolylaxetonitril)- Bng con ng ha hc tng hp c IBA, ANA.


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NI DUNG






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.

II- Cu to v phn loi auxin

2.1- Auxin t nhin

indole-3-acetic acid (IAA)

4-chloroindole-3-acetic acid (4-CI-IAA)

2-phenylacetic acid (PAA)

c tnh chung v cu to ho hc ca

auxin: khong cch t phn tch in (+) trnvng thm n phn tch in (-) ca nhmcacboxyl vo khong 0.5nm.


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II- Cu to v phn loi auxin2.2- Auxin tng hp

Indole-3-butyric acid (IBA)

2,4-dichlorophenoxyaceticacid (2,4-D)

-Naphthalene acetic acid

(-NAA)

2-Methoxy-3,6-dichlorobenzoic acid

(dicamba)

2,4,5-Trichlorophenoxyacetic acid

(2,4,5-T)


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NI DUNG






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III- Tng hp v phn hy auxin3.1- Tng hp AIA

- AIA c tng hp tt c cc thc vt bc cao, to, nm v vi khun- AIA c tng hp ch yu nh chi ngn v c vn chuyn xung di

- Tng hp auxin din ra theo con ng chung cho hu ht thc vt


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III- Tng hp v phn hy auxin

3.2- Phn hy auxin


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III- Tng hp v phn hy auxin3.3- S bin i thun nghch dng t do v dng lin kt

IAA tn ti di 2 dng- Dng t do: gy hot tnh sinh l, hm lng thp- Dng lin kt: khng c hot tnh snh l, hm lng ln d tr, vn chuyn IAA


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NI DUNG






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IV- Vai tr sinh l ca auxin4.1- Kch thch mnh m ln s gin ca t bo lm cho t bo phnh to theo chiu

ngang- Gim pH trong thnh t bo hot ha enzyme phn hy polisaccarit lin kt gia

cc si xenlulose lm chng lng lo

-Auxin kch thch tng hp cc cu t cu trc nn thnh t bo nh xenlulospectin, hemixenlulose-nh hng n s phn chia t bo (tc ng tng h vi gibberelin,xytokinin


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IV- Vai tr sinh l ca auxin4.2- Gy ra tnh hng ng ca cy

Hng ng: l hnh thc phn ng ca mt b phn ca cy trc mt tc nhn kchthch theo mt hng xc nh

- Hng ng dng: vn ng v pha tc nhn kch thch

- Hng ng m: vn ng trnh xa tc nhn kch thch

Hng t (hng trng lc)

+

-
http://var/www/apps/conversion/tmp/scratch_4/video/Root%20gravitropism.mp4http://var/www/apps/conversion/tmp/scratch_4/video/Root%20gravitropism.mp4


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Hng sng

+-

Ngn cy lun quay v hng c nh sng do sphn b auxin khng u nhau.

Nguyn nhn ca s phn b auxin khng u- Khi b kch thch s vn chuyn phn cc ca auxin b c ch- Auxin thng b ion ha IAA phn b v pha in dng trong

cc c quan
http://var/www/apps/conversion/tmp/scratch_4/video/Sunflowers%20and%20Beans%20Growing.mp4http://var/www/apps/conversion/tmp/scratch_4/video/Sunflowers%20and%20Beans%20Growing.mp4


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IV- Vai tr sinh l ca auxin4.3- Auxin gy ra hin tng u th ngn

u th ngn l s tng quan c ch m trong chi ngn hoc r chnh sinhtrng s c ch s sinh trng ca chi bn hoc r ph.

Khi ct b chi ngn hoc r chnh thchi bn, r bn c gii phng khi cch v lp tc sinh trng

Nguyn nhn: IAA c tp trung nhngn vi hm lng cao hn, trn conng vn chuyn xung di c chs sinh trng ca chi bn

Ngc li xytokinin lm yu u th ngn,

kch thch cc chi bn sinh trng


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IV- Vai tr sinh l ca auxin4.4- Auxin kch thch s hnh thnh r

Auxin Khng c auxin

S hnh thnh r ph c th chia lm 3 giai on:-Phn phn ha t bo trc tng pht sinh- Xut hin mm r- Mm r sinh trng thnh r ph


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IV- Vai tr sinh l ca auxin4.5- Auxin kch thch s hnh thnh, s sinh trng ca qu v to qu khng ht

Auxin trong ht kch thch bu pht trinthnh qu


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IV- Vai tr sinh l ca auxin4.6- Auxin km hm s rng l, hoa, qu

Auxin c ch s hnh thnh tng ri cungl, hoa, qu

S hnh thnh tng ri cn c iu chnhbi s cn bng auxin, axit abxixic, etylen

(ABA v etylen kch thch to nn cc enzymephn hy thnh t bo tng ri lm tng rinhanh chng xut hin)

S rng l l do cn bng ca auxin, ABAv etylen


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IV- Vai tr sinh l ca auxin4.7- Auxin nh hng ln s vn ng ca cht nguyn sinh

Tng tc lu ng ca cht nguyn sinh, nh hng n cc qu trnh trao i cht:kch thch s tng hp cc polime v c ch s phn hy chng, nh hg n quanghp, h hp, s vn chuyn vt cht trong cy


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Vai tr sinh l ca auxin

Kch thch mnh m ln s gin ca t bo lm cho t bo phnh to theo chiu ngang

Gy ra tnh hng ng ca cy

Auxin gy ra hin tng u th ngn

Auxin kch thch s hnh thnh r

Auxin kch thch s hnh thnh, s sinh trng ca qu v to qu khng ht

Auxin km hm s rng l, hoa, qu

Auxin nh hng ln s vn ng ca cht nguyn sinh


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NI DUNG






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V- C ch tc dng ca auxin


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V- C ch tc dng ca auxinpH t 4-5 trong thnh t bo s hot ha enzyme pectinmetylesterase, enzyme hot

ng s metyl ha cc nhm cacboxyl ngn chn s hmh thnh cu ni vi canxi- Lin kt ion thng qua nhm cacboxyl ca pectin

COO Ca++

- Enzyme metyl ha nhm cacboxyl

COOCH 3 CH COO3

OOC

Auxin phn hy cc cu ni ngang


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Tm tt vai tr auxin
http://var/www/apps/conversion/tmp/scratch_4/video/Plant%20Physiology_%20Phototropic%20Response%20(Britannica.com).mp4http://var/www/apps/conversion/tmp/scratch_4/video/Plant%20Physiology_%20Phototropic%20Response%20(Britannica.com).mp4


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Vai Tro Sinh Li Cua Auxin