Chromosome studies of some Vernonia species (Asteraceae)

DEMATTEIS, M.

GENETICS AND MOLECULAR BIOLOGY

Sociedade de Genética do Brasil

Lugar: Sao Paulo; Año: 1998 vol. 21 p. 381 - 385

1415-4757

Chromosomes of twelve Vernonia species (Asteraceae) from South America were studied. First counts were reported for: V. alpestris Gardn. (n=17), V. chalybaea Mart. ex DC. (2n=32), V. cotoneaster Less. (2n=30), V. fruticulosa Mart. ex DC. (n=16) and V. lithospermifolia Hieron. (n=10, 2n=20). Furthermore, in V. aurea Mart. ex DC. (2n=32), V. mollissima D.Don (n=32) and V. saltensis Hieron. (2n=64) different numbers than those reported in the literature were found. Karyotypes were described for some species. V. aurea contains 24m + 8sm chromosomes, V. chalybaea contains 22m + 10sm chromosomes, V. cincta Griseb. 36m + 16sm + 8st and V. cotoneaster 18m + 12sm. The basic chromosome numbers x=10, 14, 15, 16 and 17 were confirmed for South American Vernonia species. The results are discussed in relation to previous chromosome studies for the genus.