02213naa a2200313 a 450000100080000000500110000800800410001910000200006024501790008026000090025952012380026865000220150665000260152865000150155465000160156965000160158565000250160165300210162665300330164770000200168070000200170070000180172070000220173870000190176070000240177970000200180370000190182377300570184221640752024-05-03       2024    bl uuuu     u00u1 u    #d1 aGOMES, S. S. L.  aPhenotypic variation seems not to be associated with the genetic profle in Zygopetalum (Orchidaceae)ba case study of a high‑elevation rocky complex.h[electronic resource]  c2024  aBackground- Hybridization associated with polyploidy studies is rare in the tropics. The genus Zygopetalum (Orchidaceae) was investigated here as a case study of Neotropical plants. In the rocky highlands of the Ibitipoca State Park (ISP), southeast Brazil, individuals with intermediate colors and forms between the species Z. maculatum and Z. triste were commonly identifed. Methods and results -Chromosomal analysis and DNA quantity showed a uniform population. Regardless of the aspects related to the color and shape of foral structures, all individuals showed 2n=96 chromosomes and an average of 14.05 pg of DNA. Irregularities in meiosis associated with chromosome number and C value suggest the occurrence of polyploidy. The genetic distance estimated using ISSR molecular markers revealed the existence of genetic variability not related to morphological clusters. Morphometric measurements of the fower pieces revealed that Z. maculatum shows higher variation than Z. triste although lacking a defned circumscription. Conclusion - The observed variation can be explained by the polyploid and phenotypic plasticity resulting from the interaction of the genotypes with the heterogeneous environments observed in this habitat.  aGenetic variation  aPhenotypic plasticity  aPolyploidy  aOrchidaceae  aPoliploidia  aVariação Genética  aPerfil genético  aPolyploidy · Rocky outcrops1 aLOPES, J. M. L.1 aMATOS, E. M. de1 aCABRAL, E. G.1 aAZEVEDO, A. L. S.1 aMACHADO, M. A.1 aCAMPOS, J. M. S. de1 aMENINI NETO, L.1 aVICCINI, L. F.  tMolecular Biology Reportsgv. 51, article 582, 2024.