Tratamento foliar com metil jasmonato na restrição do crescimento e na anatomia de foliar de Begônia ‘Dragon Wing’
DOI:
https://doi.org/10.1590/2447-536X.v30.e242760Palavras-chave:
histologia, jasmonatos, planta envasada, regulador de crescimento vegetalResumo
A aplicação de reguladores de crescimento vegetal, principalmente os produtos inibidores de giberelina, é o principal recurso utilizado para o controle do crescimento de plantas ornamentais, no entanto, é crescente a busca por produtos alternativos devido ao risco de toxicidade ambiental causado. O metil jasmonato (MeJa) é uma substância natural encontrada em plantas e considerado de baixa toxicidade quando utilizado adequadamente, seu uso como regulador de crescimento tem se mostrado promissor para o controle do crescimento de plantas, mas seus efeitos não foram totalmente explorados na restrição do crescimento de ornamentais. O presente trabalho investigou os efeitos da aplicação foliar de diferentes concentrações de MeJa (0, 50, 100 e 150 µM) no crescimento e na anatomia foliar de Begônia ‘Dragon Wing’ Pink e Red. Foram avaliados parâmetros de crescimento das plantas e conduzidas análises histológicas quali-quantitativas da folha da Begônia. O MeJa foi eficiente em compactar a planta, reduzindo a altura em 17.57% e diâmetro em 8.98% sem comprometer a biomassa, crescimento radicular e aspectos do florescimento. A concentração média estudada também provocou alterações na anatomia foliar, aumentando a espessura da epiderme abaxial, reduzindo a espessura do mesofilo, número de cristais de oxalato de cálcio e o tamanho e o número de estômatos. Os resultados demonstraram o efeito promissor do MeJa no controle de crescimento de plantas ornamentais envasadas.
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