aula 07 anatomia vegetal 01 - introducao e meristemas
TRANSCRIPT
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Prof. M.Sc. Leonardo Kumagai Sampaio
ANATOMIA VEGETAL
BOTÂNICA II
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O QUE É ANATOMIA VEGETAL?
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O QUE É ANATOMIA VEGETAL?
Estudo das células e dos tecidos vegetais
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POR QUE ESTUDAR ANATOMIA VEGETAL?
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POR QUE ESTUDAR ANATOMIA VEGETAL?
Para entender o funcionamento
interno e externo das plantas
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INÍCIO
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INÍCIO
Desenvolvimento Embrionário
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FECUNDAÇÃO
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FECUNDAÇÃO
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EMBRIÃO
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MONOCOTILEDÔNEA
Presença de Coleóptilo
Presença de Coleorriza
Cotilédone não armazena nutrientes,
mas sim faz sua transferência
(endosperma-embrião)
Endosperma ocupa ~80% da semente
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EMBRIÃO MADURO
3 tipos principais - desenhar
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SEMENTE MADURA
Embrião
Endosperma
Tegumento
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DISPERSÃO
Anemocoria
Ornitocoria
Zoocoria
Hidrocoria
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GERMINAÇÃO
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GERMINAÇÃO
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Epicótilo + Hipocótilo = Caulídeo
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NECESSIDADES PARA GERMINAR
Luz
Água
Temperatura
Oxigênio
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NECESSIDADE DE LUZ
Fotoblásticas positivas
Fotoblásticas negativas
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Epicótilo + Hipocótilo = Caulídeo
Tipos de Germinação
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AO QUE SE DEVE O CRESCIMENTO
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AO QUE SE DEVE O CRESCIMENTO?
A multiplicação celular nos extremos
do embrião!!!
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MERISTEMAS
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MERISTEMAS
Tecido indiferenciado que origina
novas células
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CARACTERÍSTICAS DOS MERISTEMAS
Parede Celular Delgada
Citoplasma Abundante
Núcleo Grande
Vacúolos pequenos ou ausentes
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ONDE SE ENCONTRAM OS MERISTEMAS?
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ONDE SE ENCONTRAM OS MERISTEMAS?
Nos extremos do embrião:
Meristema apical Caulinar
Meristema apical Radicular
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ORIGINAM OS TODOS OS TECIDOS
Sistema de revestimento (proteção)
Sistema vascular (condução)
Sistema fundamental (outras funções)
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MERISTEMAS APICAIS DÃO ORIGEM À
Protoderme
Meristema fundamental
Protocambio
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MERISTEMAS APICAIS DÃO ORIGEM À
1. Coifa
2. Promeristema
3. Protoderme
4. Protocambio
5. Meristema
fundamental
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RAIZ DE ALLIUM CEPA
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TECIDOS
Protoderme -> Epiderme
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TECIDOS
Protocambio -> Xilema e Floema
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TECIDOS
Meristema Fundamental
Parênquima
Colênquima
Esclerênquima
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TECIDOS
Crescimento Secundário
Câmbio Vascular e Câmbio da Casca
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TECIDOS
Crescimento Secundário:
Câmbio Vascular
Xilema secundário
Floema secundário
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TECIDOS
Crescimento Secundário
Câmbio da Casca
Periderme
Felema (súber)
Felogênio
Feloderme
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PARA A PRÓXIMA AULA
Responda: Quais os tipos de
meristemas e quais suas funções.
Próxima Aula Prática:
Trazer Jaleco
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Prof. M.Sc. Leonardo Kumagai Sampaio
ANATOMIA VEGETAL
BOTÂNICA II