Chromosome counts of some species of the genus Galium (Rubiaceae) from Iran

Abstract

Data on the chromosome counts of ten taxa of the genus Galium are reported from northeastern Iran. Two basic chromosome numbers, i.e. x = 10 and x = 11, as well as three ploidy levels, i.e. 2x, 4x and 6x are reported. Both diploid and polyploidy levels are observed. Aneuploidy was only observed in G. aparine. The chromosome numbers of the following taxa are counted for the first time: G. diploprion, G. humifusum, G. nigricans with 2n = 22 and G. spurium subsp. ibicinum with 2n = 20. The new data are compared with previous karyological information, and are discussed. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Cytogenetic, chromosome count optimization and automation of Neolamarckia cadamba (Rubiaceae) root tips derived from in vitro mutagenesis

“…It is generally accepted that most species in the Rubiaceae family that N. cadamba belongs to have a basic chromosome number 11 (x = 11). This basic chromosome number is still valid, in agreement with our study and many other studies in decades (Khoshoo et al (1963); Lee (1979); Bedi et al (1981); Kiehn (1986); Kiehn (1995); Corréa and Forni-Martins (2004); Kiehn (2010); Mehrvarz and Ghadim (2015)). Based on the most comprehensive chromosome number data compiled in 1979; 730 species in the Rubiaceae family were examined; 493 species have chromosome base number x = 11; 200 species are polyploids at different levels of ploidy and 155 species are tetraploids with 44 chromosomes (2n = 4x = 44) (Lee, 1979).…”