Abstract:

Karyotype analysis and 45S rDNA- florescence in situ hybridization (FISH) mapping of Torenia fournieri L. were performed by using Lycopersicon esculentum 45S rDNA as a probe. The T. fournieri karyotype was classified into the type 1A in the Stebbins' category. The Asymmetry Index was 57.46. Variation in chromosome relative length ranged from 4.455% to 6.990%. The ratio of the longest over the shortest length of chromosomes (L/S) was 1.57. Chromosome constitution of relative length was 2L + 4M2 +12M1. The karyotype formula can be represented as 2n = 2x = 18 = 14m + 4sm (2SAT). Two hybridized signals were found on the chromosome 5p near the centromere at the metaphase and in the interphase nucleus of T. fournieri. An idiogram was obtained based on these findings.

Key words: Torenia fournieri L., florescence in situ hybridization, 45S rDNA, karyotype