Anatomy of the invasive orchid Oeceoclades maculata: ecological implications

Periodo de realización: 1900/01/01 al 2017/06/01

Tipo: Artículo científico

Lugar(es) de estudio: Tapachula, Chis., México
Resumen: "Oeceoclades maculata is the most successful invasive orchid in the Neotropics. The anatomy of the vegetative organs,peduncle and seeds of O. maculata was characterized to identify features of possible physiological and ecologicalimportance. Plants from four locations in Soconusco, Chiapas, Mexico were selected. Transverse, longitudinal andparadermal sections of vegetative organs were observed using light and scanning electron microscopes. Oeceocladesmaculata has amphistomatous leaves, with smooth and a thin to slightly thickened cuticle, a single-layered epidermis,a low density of small stomata (<13 mm-2) and numerous sunken glandular hairs on both surfaces. Mesophyllis homogeneous with abundant extravascular fibre bundles. The root has a multilayered velamen with abundanttilosomes. Numerous idioblasts with raphides were observed in leaves, pseudobulbs and roots. The seeds are fusiform,with smooth surfaces and transverse folds. Some of these traits link O. maculata with terrestrial and epiphytichabits and with xerophytic habits, with humid and high light intensity and humid environments. This combinationof traits might be a key factor behind the success and expansion of O. maculata. Nonetheless, a detailed characterizationof the microhabitats occupied, demography, reproductive strategies and mycorrhizal associations will be essentialfor understanding the behaviour of this invasive species and, if necessary, designing strategies for its control."

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