Development of Epidendrum denticulatum (Orchidaceae) plants subjected to water deficit
DOI:
https://doi.org/10.21826/2446-82312025v80e20251194Palavras-chave:
déficit de água, irrigação, orquídea, sobrevivênciaResumo
A deficiência hídrica é um dos principais estresses abióticos que atuam negativamente sobre o crescimento vegetal. Este trabalho teve como avaliar a sobrevivência e o desenvolvimento de plantas de Epidendrum denticulatum Barb. Rodr. submetidas a estresse hídrico. Plantas aclimatizadas desta espécie com seis meses de idade, oriundas da germinação assimbiótica, foram submetidas aos seguintes tratamentos: irrigação diária, irrigação quinzenal e sem irrigação. Estas plantas foram avaliadas após 75 e 150 dias de cultivo, por meio da coleta de dados de variáveis de desenvolvimento e de produção de pigmentos. Após 75 dias, a sobrevivência variou de 95 a 100% nos diferentes regimes de irrigação, entretanto, houve redução dos números de folhas e de raízes novas, nas plantas irrigadas quinzenalmente e não irrigadas. Aos 150 dias, a sobrevivência variou de 35% (não irrigadas) a 95% (irrigadas diariamente) e os efeitos sobre a inibição do desenvolvimento foram mais severos, por exemplo, inibindo completamente a emissão de raízes novas e reduzindo o teor de pigmentos fotossintéticos. Apesar dessa inibição, a elevada sobrevivência obtida após 75 dias de interrupção da irrigação permite concluir que E. denticulatum é resistente ao déficit hídrico, tolerando a seca, e pode ser utilizada no enriquecimento de áreas de vegetação nativa.
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