Resumo

JIMENEZ-PENA, Nadia; TREJO-TELLEZ, Libia I.  e  JUAREZ-LOPEZ, Porfirio. Concentration of macronutrients in organs of three wild Rhynchostele species in their natural habitat. Rev. Mex. Cienc. Agríc [online]. 2018, vol.9, n.5, pp.971-980. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v9i5.266.

In Mexico, there is little research on the nutritional concentration of orchid species developed in their natural habitat. The objective was to determine the macronutrient concentration of the wild orchids Rinchostele maculata, R. rossii and R. aptera in their natural habitat. The collections were made from R. maculata in the central zone of Veracruz, R. rossii was obtained from the Chichinautzin Biological Corridor in the northwest of Morelos and from the cloud forest of the Cofre of Perote, in Veracruz, the R. aptera species was collected in Huitzilac and Tetela of Volcan, Morelos. The nutritional concentration of N, P, K, Ca and Mg was quantified in young leaves and flower buds, new leaves, mature leaves and old leaves (in senescence), new pseudobulbs, mature pseudobulbs, old pseudobulbs; In addition, the same nutrients were quantified in the roots. It was found in R. rosii, R. maculata and R. aptera that the nutrient concentrations, in decreasing order, were N> K> Ca> P> Mg in young leaves, new leaves and mature leaves; with the exception of R. rosii, which showed the trend N> Ca> K> Mg> P, only in mature leaves. The nutrient concentration intervals in mature leaves, in percentage, were: N (1.44 - 1.86), P (0.15 - 0.29), K (0.51 - 0.9), Ca (0.32 - 0.65) and Mg (0.11 - 0.25), which could serve as preliminary reference values for nutrimental diagnostic purposes in the three species reported; likewise, these results could be useful in conservation programs and for the agronomic management of these species.

Palavras-chave : Rhynchostele aptera; Rhynchostele maculata; Rhynchostele rossii; mineral nutrition.

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