Cytogenetical studies in fourteen South American species of Serjania Mill. (Sapindaceae: Paullinieae)

URDAMPILLETA, J. D.; FERRUCCI, M. S.; VANZELA, A. L. L.

PLANT BIOSYSTEMS

TAYLOR & FRANCIS LTD

Año: 2011

1126-3504

Serjania Mill. (Paullinieae) is considered the most important neotropical genus of Sapindaceae due to species number and its widespread distribution. In this study fourteen species of three sections were analyzed using conventional staining, C-Giemsa and C-CMA3/DAPI banding, and fluorescence in situ hybridization (FISH) with the 45S rDNA probe. New chromosome counts are reported for S. crassifolia, S. platycarpa and S. regnellii, all with 2n = 24, which is remarkably constant for Serjania. The karyotypes are moderately asymmetric, and variations observed in A1 and A2 indexes show resemblances between S. platycarpa, S. hebecarpa and S. crassifolia respectively, and between S. communis, S. gracilis and S. regnellii. The banding pattern was homogeneous in Serjania. C-Giemsa and C-DAPI bands (AT-rich sites) were not clearly evidenced, but changes in the number and position of GC-rich sites (C-CMA3 bands) were observed. These last segments were associated with 45S rDNA sites, detected with the pTa71 probe. The significance of the results is discussed in relation to chromosomal data available for the genus and also in regard to the infrageneric treatment of Serjania.