CYTOLOGICAL STUDIES OF THE GENUS CLYPEOLA L. (BRASSICACEAE) IN IRAN

The karyotype and meiotic studies are investigated in 17 populations of four clypeola species growing in iran for the first time. the species studied showed 2n=2x=14 for c. lappacea and c. dichotoma while c. aspera and c. jonthlaspi were tetraploids. for c. aspera 2n=4x=26 & 24 and for c. jonthlaspi 2n=4x=32 were counted, supporting the published reports on c. jonthlaspi, c. lappacea, c. dichotoma and c. aspera. the karyotypic study was performed for c. aspera and c. lappacea. the chromosomes in these species were mainly metacentric and sub-metacentric. mixoploidy and polysomaty has been observed in c. aspera populations. meiosis studies were performed on 6 populations of three species of clypeola. chromosome number of n=16 for c. jonthlaspi, n=12 & 13 for c. aspera and n=7& 8 for c. lappacea were observed. disploidy was observed in c. aspera and c. lappacea. desynapsis and b chromosome are present in c. lappacea. unreduced pollen grains were observed in three species.