crescimento e diferenciação balbach/bliss – a laboratory manual for botany – saunders college...
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Crescimento e diferenciação
Balbach/Bliss – A Laboratory Manual for Botany – Saunders College Pub
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Crescimento e diferenciação
raiz
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http://media.tiscali.co.uk/images/feeds/hutchinson/ency/c01094.jpg
http://12knights.pbworks.com/f/1272554206/38_10SeedGermination-dicot.jpg
Ch
loris
sp
. (P
oa
cea
e)
cort
esi
a:
Dra
. V
era
Sca
ten
a
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domínioembrionário
hipófise
suspensor
Esquema mostrando as primeiras fases da embriogênese
MP = fator de transcrição que codifica um elemento de resposta à auxina
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Taiz e Zeiger, 2009
Estágios de desenvolvimento de embrião de Arabidopsis
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Jones et al. 2013. The molecular life of plants. Wiley-Blackwell
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centro quiescente (CQ)
SHR (expresso no estelo) SCR identidade do CQ
máxima auxina
WOX5 (expresso no CQ) previne diferenciação das células vizinhas
WOX5
estelo
SHR/SCR/WOX5 – fatores de transcriçãoACR4 – receptor cinaseCLE40 – peptídeo sinalização
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Taiz e Zeiger, 2009
padrão de fluxo de auxina deve determinar atividade do meristema apical da raiz
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auxinaJo
ne
s e
t a
l. 2
01
3. T
he
mo
lecu
lar
life
of
pla
nts
. W
iley-
Bla
ckw
ell
AUX/IAA (repressor)
ARF (fator de transcrição)
ativação de genes de resposta à auxina
periciclo
iniciação de raízes laterais(posicionamento ?)
gravidade?outros hormônios?minerais?
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Crescimento e diferenciação
caule
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seção longitudinal do ápice de Coleus sp.
primórdio degema lateral
Jones et al. 2013. The molecular life of plants. Wiley-Blackwell
ápice caulinar
* meristema apical do caule
*
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Taiz e Zeiger, 2012, Fisiologia Vegetal, ArtMed
CZ = zona centralPZ = zona periféricaRZ = zona medular
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divisões celulares
WUS
CLV3
WUS = fator de transcriçãoCLV = receptor cinase
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Crescimento e diferenciação
folha
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auxina iniciação folha (P)
dreno de auxina
inibe formação de
primórdio logo acima
Jones et al. 2013. The molecular life of plants. Wiley-Blackwell
PAT = transporte polar de auxinas
KNOX : “ligado” no meristema “desligado” na iniciação dos primórdios
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Taiz e Zeiger, 2012, Fisiologia Vegetal, ArtMed
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YABBY
AS
HD-ZIPIII
KAN
YABBY
KAN
HD-ZIPIII
fatores de resposta à auxina
meristema
primórdio
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