Morphological effects of induced polyploidy in Dendrobium nobile Lindl. (Orchidaceae)
Mívia Rosa de Medeiros Vichiato, Marcelo Vichiato, Moacir Pasqual, Filipe Almendagna Rodrigues and Daniel Melo de Castro
Abstract – In general, polyploidy in plants causes an increase in the size of vegetative structures. This work aimed to compare diploid plants (2n = 2 x = 38) and induced tetraploid plants (2n = 4 x = 76) of Dendrobium nobile Lindl. through the evaluation of the morphological characteristics of flowers, leaves and pseudobulbs. We evaluated the parameters height and diameter of pseudobulbs; width and length of leaves and flowers (sepals, petals and labella); and diameter of flowers. The induced polyploidization resulted in the increasing the number of internodes (19.9%) and floral pieces, with greater height of the flower (4.5%) and width of the lip (18.5%) decrease in the number of flowers per pseudobulb (40.9%) and the diameter of the pseudobulb (64.9%) and delayed flowering.