Karyotypes of seven South American species of Vernonia (Asteraceae)

DEMATTEIS, M.; FERNÁNDEZ, A.

CYTOLOGIA

Japan Mendel Society

Lugar: Tokio; Año: 1998 vol. 63 p. 323 - 328

0011-4545

The karyotypes of seven South American species of Vernonia were analyzed in detail. First chromosome count are reported for V. amplexicaulis (2n=34= 24m + 10sm), V. ferruginea (2n=34= 20m + 14sm), V. pinguis (2n=68= 42m + 26sm) and V. squamulosa (2n=34= 20m + 2m-sm + 12sm). Furthermore, the chromosome numbers of V. chamaedrys (2n=34= 22m + 12sm), V. fulta (2n=34= 24m + 10sm) and V. nudiflora (2n=34= 24m + 10sm) are also confirmed. The seven species showed similar karyotype symmetry, chromosome size and satellite position, which would support a close relationship among they. Chromosomal data available for the genus and the results obtained here suggests that species with pyramidal or thyrsoid inflorescence have x=17, while entities with scorpioid or seriate inflorescence possess mainly basic numbers x=16, x=15 or x=14.