hormônios vegetais (1)
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Hormônios Vegetais (Fitormônios)
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Auxinas
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Agente Laranja
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Giberelinas
• Descoberta: Plantas de arroz infectadas com Gibberella fujikuroi (fungo) tinham crescimento excessivo. Japão, 1926.
• Folhas jovens, raízes e sementes são locais de produção.
• Substâncias que inibem sua síntese, retardam o crescimento das plantas.
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• Funções:
- Crescimento (mitose e alongamento celular);- Quebra da dormência de sementes (clima
temperado) – vernalização.- Florescimento em PDL;- Mobilização do endosperma (sementes);- Crescimento dos frutos.
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• Uso Artificial:
- Floração em PDL nos dias curtos;- Uvas partenocárpicas e com cachos mais
abertos (crescimento do peduncúlo);- Estiolamento;- Aumento das taxas de maltagem (cervejarias).
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Citocininas
• Produzidas nas raízes.• Hormônios reguladores:
- Controle na formação dos tecidos (diferenciação);- Crescimento lateral;- Formação dos ramos laterais e folhas;
- Evita a senescência *;
* Usada em hortaliças (maior durabilidade)
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Etileno (CH2=CH2)
• Promove o amadurecimento dos frutos;
• Abscisão de folhas, flores e frutos (zona de abscisão);
• Quebra da dormência de sementes;
• Formação de raízes.
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Ácido abscísico (ABA)
• Produzido em situações de estresse hídrico pelas plantas:
- Fechamento estomático;- Quebra das reservas de amido;- Não formação ou queda de flores e frutos;- Queda de folhas;
- Dormência em sementes.